1 /*
2 * Copyright (C) 2015 Red Hat Inc.
3 * Hans de Goede <hdegoede@redhat.com>
4 * Copyright (C) 2008 SuSE Linux Products GmbH
5 * Thomas Renninger <trenn@suse.de>
6 *
7 * May be copied or modified under the terms of the GNU General Public License
8 *
9 * video_detect.c:
10 * After PCI devices are glued with ACPI devices
11 * acpi_get_pci_dev() can be called to identify ACPI graphics
12 * devices for which a real graphics card is plugged in
13 *
14 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
15 * are available, video.ko should be used to handle the device.
16 *
17 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
18 * sony_acpi,... can take care about backlight brightness.
19 *
20 * Backlight drivers can use acpi_video_get_backlight_type() to determine which
21 * driver should handle the backlight. RAW/GPU-driver backlight drivers must
22 * use the acpi_video_backlight_use_native() helper for this.
23 *
24 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
25 * this file will not be compiled and acpi_video_get_backlight_type() will
26 * always return acpi_backlight_vendor.
27 */
28
29 #include <linux/export.h>
30 #include <linux/acpi.h>
31 #include <linux/apple-gmux.h>
32 #include <linux/backlight.h>
33 #include <linux/dmi.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
37 #include <linux/pnp.h>
38 #include <linux/types.h>
39 #include <linux/workqueue.h>
40 #include <acpi/video.h>
41
42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
44
acpi_video_parse_cmdline(void)45 static void acpi_video_parse_cmdline(void)
46 {
47 if (!strcmp("vendor", acpi_video_backlight_string))
48 acpi_backlight_cmdline = acpi_backlight_vendor;
49 if (!strcmp("video", acpi_video_backlight_string))
50 acpi_backlight_cmdline = acpi_backlight_video;
51 if (!strcmp("native", acpi_video_backlight_string))
52 acpi_backlight_cmdline = acpi_backlight_native;
53 if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
54 acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
55 if (!strcmp("apple_gmux", acpi_video_backlight_string))
56 acpi_backlight_cmdline = acpi_backlight_apple_gmux;
57 if (!strcmp("none", acpi_video_backlight_string))
58 acpi_backlight_cmdline = acpi_backlight_none;
59 }
60
61 static acpi_status
find_video(acpi_handle handle,u32 lvl,void * context,void ** rv)62 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
63 {
64 struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
65 long *cap = context;
66 struct pci_dev *dev;
67
68 static const struct acpi_device_id video_ids[] = {
69 {ACPI_VIDEO_HID, 0},
70 {"", 0},
71 };
72
73 if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
74 dev = acpi_get_pci_dev(handle);
75 if (!dev)
76 return AE_OK;
77 pci_dev_put(dev);
78 *cap |= acpi_is_video_device(handle);
79 }
80 return AE_OK;
81 }
82
83 /* This depends on ACPI_WMI which is X86 only */
84 #ifdef CONFIG_X86
nvidia_wmi_ec_supported(void)85 static bool nvidia_wmi_ec_supported(void)
86 {
87 struct wmi_brightness_args args = {
88 .mode = WMI_BRIGHTNESS_MODE_GET,
89 .val = 0,
90 .ret = 0,
91 };
92 struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
93 acpi_status status;
94
95 status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
96 WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
97 if (ACPI_FAILURE(status))
98 return false;
99
100 /*
101 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
102 * should be used, else the GPU driver(s) should be used.
103 */
104 return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
105 }
106 #else
nvidia_wmi_ec_supported(void)107 static bool nvidia_wmi_ec_supported(void)
108 {
109 return false;
110 }
111 #endif
112
113 /* Force to use vendor driver when the ACPI device is known to be
114 * buggy */
video_detect_force_vendor(const struct dmi_system_id * d)115 static int video_detect_force_vendor(const struct dmi_system_id *d)
116 {
117 acpi_backlight_dmi = acpi_backlight_vendor;
118 return 0;
119 }
120
video_detect_force_video(const struct dmi_system_id * d)121 static int video_detect_force_video(const struct dmi_system_id *d)
122 {
123 acpi_backlight_dmi = acpi_backlight_video;
124 return 0;
125 }
126
video_detect_force_native(const struct dmi_system_id * d)127 static int video_detect_force_native(const struct dmi_system_id *d)
128 {
129 acpi_backlight_dmi = acpi_backlight_native;
130 return 0;
131 }
132
video_detect_portege_r100(const struct dmi_system_id * d)133 static int video_detect_portege_r100(const struct dmi_system_id *d)
134 {
135 struct pci_dev *dev;
136 /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
137 dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
138 if (dev)
139 acpi_backlight_dmi = acpi_backlight_vendor;
140 return 0;
141 }
142
143 static const struct dmi_system_id video_detect_dmi_table[] = {
144 /*
145 * Models which should use the vendor backlight interface,
146 * because of broken ACPI video backlight control.
147 */
148 {
149 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
150 .callback = video_detect_force_vendor,
151 /* Acer KAV80 */
152 .matches = {
153 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
154 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
155 },
156 },
157 {
158 .callback = video_detect_force_vendor,
159 /* Asus UL30VT */
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
162 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
163 },
164 },
165 {
166 .callback = video_detect_force_vendor,
167 /* Asus UL30A */
168 .matches = {
169 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
170 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
171 },
172 },
173 {
174 .callback = video_detect_force_vendor,
175 /* Asus X55U */
176 .matches = {
177 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
178 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
179 },
180 },
181 {
182 /* https://bugs.launchpad.net/bugs/1000146 */
183 .callback = video_detect_force_vendor,
184 /* Asus X101CH */
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
187 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
188 },
189 },
190 {
191 .callback = video_detect_force_vendor,
192 /* Asus X401U */
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
196 },
197 },
198 {
199 .callback = video_detect_force_vendor,
200 /* Asus X501U */
201 .matches = {
202 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
204 },
205 },
206 {
207 /* https://bugs.launchpad.net/bugs/1000146 */
208 .callback = video_detect_force_vendor,
209 /* Asus 1015CX */
210 .matches = {
211 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
212 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
213 },
214 },
215 {
216 .callback = video_detect_force_vendor,
217 /* Samsung N150/N210/N220 */
218 .matches = {
219 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
220 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
221 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
222 },
223 },
224 {
225 .callback = video_detect_force_vendor,
226 /* Samsung NF110/NF210/NF310 */
227 .matches = {
228 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
230 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
231 },
232 },
233 {
234 .callback = video_detect_force_vendor,
235 /* Samsung NC210 */
236 .matches = {
237 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
238 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
239 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
240 },
241 },
242 {
243 .callback = video_detect_force_vendor,
244 /* Xiaomi Mi Pad 2 */
245 .matches = {
246 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
247 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
248 },
249 },
250
251 /*
252 * Models which should use the vendor backlight interface,
253 * because of broken native backlight control.
254 */
255 {
256 .callback = video_detect_force_vendor,
257 /* Sony Vaio PCG-FRV35 */
258 .matches = {
259 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
260 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
261 },
262 },
263 {
264 .callback = video_detect_force_vendor,
265 /* Panasonic Toughbook CF-18 */
266 .matches = {
267 DMI_MATCH(DMI_SYS_VENDOR, "Matsushita Electric Industrial"),
268 DMI_MATCH(DMI_PRODUCT_NAME, "CF-18"),
269 },
270 },
271
272 /*
273 * Toshiba models with Transflective display, these need to use
274 * the toshiba_acpi vendor driver for proper Transflective handling.
275 */
276 {
277 .callback = video_detect_force_vendor,
278 .matches = {
279 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
280 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
281 },
282 },
283 {
284 .callback = video_detect_force_vendor,
285 .matches = {
286 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
287 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
288 },
289 },
290
291 /*
292 * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
293 * vendor driver. But none of them gets activated as it has a VGA with
294 * no kernel driver (Trident CyberBlade XP4m32).
295 * The DMI strings are generic so check for the VGA chip in callback.
296 */
297 {
298 .callback = video_detect_portege_r100,
299 .matches = {
300 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
301 DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
302 DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
303 DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
304 },
305 },
306
307 /*
308 * Models which need acpi_video backlight control where the GPU drivers
309 * do not call acpi_video_register_backlight() because no internal panel
310 * is detected. Typically these are all-in-ones (monitors with builtin
311 * PC) where the panel connection shows up as regular DP instead of eDP.
312 */
313 {
314 .callback = video_detect_force_video,
315 /* Apple iMac14,1 */
316 .matches = {
317 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
318 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
319 },
320 },
321 {
322 .callback = video_detect_force_video,
323 /* Apple iMac14,2 */
324 .matches = {
325 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
326 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
327 },
328 },
329
330 /*
331 * These models have a working acpi_video backlight control, and using
332 * native backlight causes a regression where backlight does not work
333 * when userspace is not handling brightness key events. Disable
334 * native_backlight on these to fix this:
335 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
336 */
337 {
338 .callback = video_detect_force_video,
339 /* ThinkPad T420 */
340 .matches = {
341 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
342 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
343 },
344 },
345 {
346 .callback = video_detect_force_video,
347 /* ThinkPad T520 */
348 .matches = {
349 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
350 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
351 },
352 },
353 {
354 .callback = video_detect_force_video,
355 /* ThinkPad X201s */
356 .matches = {
357 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
358 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
359 },
360 },
361 {
362 .callback = video_detect_force_video,
363 /* ThinkPad X201T */
364 .matches = {
365 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
366 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
367 },
368 },
369
370 /* The native backlight controls do not work on some older machines */
371 {
372 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
373 .callback = video_detect_force_video,
374 /* HP ENVY 15 Notebook */
375 .matches = {
376 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
377 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
378 },
379 },
380 {
381 .callback = video_detect_force_video,
382 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
383 .matches = {
384 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
385 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
386 },
387 },
388 {
389 .callback = video_detect_force_video,
390 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
391 .matches = {
392 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
393 DMI_MATCH(DMI_PRODUCT_NAME,
394 "370R4E/370R4V/370R5E/3570RE/370R5V"),
395 },
396 },
397 {
398 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
399 .callback = video_detect_force_video,
400 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
401 .matches = {
402 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
403 DMI_MATCH(DMI_PRODUCT_NAME,
404 "3570R/370R/470R/450R/510R/4450RV"),
405 },
406 },
407 {
408 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
409 .callback = video_detect_force_video,
410 /* SAMSUNG 670Z5E */
411 .matches = {
412 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
413 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
414 },
415 },
416 {
417 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
418 .callback = video_detect_force_video,
419 /* SAMSUNG 730U3E/740U3E */
420 .matches = {
421 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
422 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
423 },
424 },
425 {
426 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
427 .callback = video_detect_force_video,
428 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
429 .matches = {
430 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
431 DMI_MATCH(DMI_PRODUCT_NAME,
432 "900X3C/900X3D/900X3E/900X4C/900X4D"),
433 },
434 },
435 {
436 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
437 .callback = video_detect_force_video,
438 /* Dell XPS14 L421X */
439 .matches = {
440 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
441 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
442 },
443 },
444 {
445 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
446 .callback = video_detect_force_video,
447 /* Dell XPS15 L521X */
448 .matches = {
449 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
450 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
451 },
452 },
453 {
454 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
455 .callback = video_detect_force_video,
456 /* SAMSUNG 530U4E/540U4E */
457 .matches = {
458 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
459 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
460 },
461 },
462 {
463 /* https://bugs.launchpad.net/bugs/1894667 */
464 .callback = video_detect_force_video,
465 /* HP 635 Notebook */
466 .matches = {
467 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
468 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
469 },
470 },
471
472 /* Non win8 machines which need native backlight nevertheless */
473 {
474 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
475 .callback = video_detect_force_native,
476 /* Lenovo Ideapad S405 */
477 .matches = {
478 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
479 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
480 },
481 },
482 {
483 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
484 .callback = video_detect_force_native,
485 /* Lenovo Ideapad Z470 */
486 .matches = {
487 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
488 DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
489 },
490 },
491 {
492 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
493 .callback = video_detect_force_native,
494 /* Lenovo Ideapad Z570 */
495 .matches = {
496 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
497 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
498 },
499 },
500 {
501 .callback = video_detect_force_native,
502 /* Lenovo E41-25 */
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
506 },
507 },
508 {
509 .callback = video_detect_force_native,
510 /* Lenovo E41-45 */
511 .matches = {
512 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
513 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
514 },
515 },
516 {
517 .callback = video_detect_force_native,
518 /* Lenovo Slim 7 16ARH7 */
519 .matches = {
520 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
521 DMI_MATCH(DMI_PRODUCT_NAME, "82UX"),
522 },
523 },
524 {
525 .callback = video_detect_force_native,
526 /* Lenovo ThinkPad X131e (3371 AMD version) */
527 .matches = {
528 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
529 DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
530 },
531 },
532 {
533 .callback = video_detect_force_native,
534 /* Apple iMac11,3 */
535 .matches = {
536 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
537 DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
538 },
539 },
540 {
541 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
542 .callback = video_detect_force_native,
543 /* Apple iMac12,1 */
544 .matches = {
545 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
546 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
547 },
548 },
549 {
550 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
551 .callback = video_detect_force_native,
552 /* Apple iMac12,2 */
553 .matches = {
554 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
555 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
556 },
557 },
558 {
559 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
560 .callback = video_detect_force_native,
561 /* Apple MacBook Pro 12,1 */
562 .matches = {
563 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
564 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
565 },
566 },
567 {
568 .callback = video_detect_force_native,
569 /* Dell Inspiron N4010 */
570 .matches = {
571 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
572 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
573 },
574 },
575 {
576 .callback = video_detect_force_native,
577 /* Dell Vostro V131 */
578 .matches = {
579 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
580 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
581 },
582 },
583 {
584 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
585 .callback = video_detect_force_native,
586 /* Dell XPS 17 L702X */
587 .matches = {
588 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
589 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
590 },
591 },
592 {
593 .callback = video_detect_force_native,
594 /* Dell Precision 7510 */
595 .matches = {
596 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
597 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
598 },
599 },
600 {
601 .callback = video_detect_force_native,
602 /* Dell Studio 1569 */
603 .matches = {
604 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
605 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
606 },
607 },
608 {
609 .callback = video_detect_force_native,
610 /* Acer Aspire 3830TG */
611 .matches = {
612 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
613 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
614 },
615 },
616 {
617 .callback = video_detect_force_native,
618 /* Acer Aspire 4810T */
619 .matches = {
620 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
621 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
622 },
623 },
624 {
625 .callback = video_detect_force_native,
626 /* Acer Aspire 5738z */
627 .matches = {
628 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
629 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
630 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
631 },
632 },
633 {
634 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
635 .callback = video_detect_force_native,
636 /* Acer Aspire 5741 */
637 .matches = {
638 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
639 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
640 },
641 },
642 {
643 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
644 .callback = video_detect_force_native,
645 /* Acer Aspire 5750 */
646 .matches = {
647 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
648 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
649 },
650 },
651 {
652 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
653 .callback = video_detect_force_native,
654 /* Acer Extensa 5235 */
655 .matches = {
656 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
657 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
658 },
659 },
660 {
661 .callback = video_detect_force_native,
662 /* Acer TravelMate 4750 */
663 .matches = {
664 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
665 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
666 },
667 },
668 {
669 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
670 .callback = video_detect_force_native,
671 /* Acer TravelMate 5735Z */
672 .matches = {
673 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
674 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
675 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
676 },
677 },
678 {
679 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
680 .callback = video_detect_force_native,
681 /* Acer TravelMate 5760 */
682 .matches = {
683 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
684 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
685 },
686 },
687 {
688 .callback = video_detect_force_native,
689 /* ASUSTeK COMPUTER INC. GA401 */
690 .matches = {
691 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
692 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
693 },
694 },
695 {
696 .callback = video_detect_force_native,
697 /* ASUSTeK COMPUTER INC. GA502 */
698 .matches = {
699 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
700 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
701 },
702 },
703 {
704 .callback = video_detect_force_native,
705 /* ASUSTeK COMPUTER INC. GA503 */
706 .matches = {
707 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
708 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
709 },
710 },
711 {
712 .callback = video_detect_force_native,
713 /* Asus U46E */
714 .matches = {
715 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
716 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
717 },
718 },
719 {
720 .callback = video_detect_force_native,
721 /* Asus UX303UB */
722 .matches = {
723 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
724 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
725 },
726 },
727 {
728 .callback = video_detect_force_native,
729 /* HP EliteBook 8460p */
730 .matches = {
731 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
732 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
733 },
734 },
735 {
736 .callback = video_detect_force_native,
737 /* HP Pavilion g6-1d80nr / B4U19UA */
738 .matches = {
739 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
740 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
741 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
742 },
743 },
744 {
745 .callback = video_detect_force_native,
746 /* Samsung N150P */
747 .matches = {
748 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
749 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
750 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
751 },
752 },
753 {
754 .callback = video_detect_force_native,
755 /* Samsung N145P/N250P/N260P */
756 .matches = {
757 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
758 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
759 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
760 },
761 },
762 {
763 .callback = video_detect_force_native,
764 /* Samsung N250P */
765 .matches = {
766 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
767 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
768 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
769 },
770 },
771 {
772 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
773 .callback = video_detect_force_native,
774 /* Sony Vaio VPCEH3U1E */
775 .matches = {
776 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
777 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
778 },
779 },
780 {
781 .callback = video_detect_force_native,
782 /* Sony Vaio VPCY11S1E */
783 .matches = {
784 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
785 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
786 },
787 },
788
789 /*
790 * These Toshibas have a broken acpi-video interface for brightness
791 * control. They also have an issue where the panel is off after
792 * suspend until a special firmware call is made to turn it back
793 * on. This is handled by the toshiba_acpi kernel module, so that
794 * module must be enabled for these models to work correctly.
795 */
796 {
797 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
798 .callback = video_detect_force_native,
799 /* Toshiba Portégé R700 */
800 .matches = {
801 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
802 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
803 },
804 },
805 {
806 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
807 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
808 .callback = video_detect_force_native,
809 /* Toshiba Satellite/Portégé R830 */
810 .matches = {
811 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
812 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
813 },
814 },
815 {
816 .callback = video_detect_force_native,
817 /* Toshiba Satellite/Portégé Z830 */
818 .matches = {
819 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
820 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
821 },
822 },
823
824 /*
825 * Models which have nvidia-ec-wmi support, but should not use it.
826 * Note this indicates a likely firmware bug on these models and should
827 * be revisited if/when Linux gets support for dynamic mux mode.
828 */
829 {
830 .callback = video_detect_force_native,
831 /* Dell G15 5515 */
832 .matches = {
833 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
834 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
835 },
836 },
837 {
838 .callback = video_detect_force_native,
839 .matches = {
840 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
841 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
842 },
843 },
844 { },
845 };
846
google_cros_ec_present(void)847 static bool google_cros_ec_present(void)
848 {
849 return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
850 }
851
852 /*
853 * Windows 8 and newer no longer use the ACPI video interface, so it often
854 * does not work. So on win8+ systems prefer native brightness control.
855 * Chromebooks should always prefer native backlight control.
856 */
prefer_native_over_acpi_video(void)857 static bool prefer_native_over_acpi_video(void)
858 {
859 return acpi_osi_is_win8() || google_cros_ec_present();
860 }
861
862 /*
863 * Determine which type of backlight interface to use on this system,
864 * First check cmdline, then dmi quirks, then do autodetect.
865 */
__acpi_video_get_backlight_type(bool native,bool * auto_detect)866 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
867 {
868 static DEFINE_MUTEX(init_mutex);
869 static bool nvidia_wmi_ec_present;
870 static bool apple_gmux_present;
871 static bool native_available;
872 static bool init_done;
873 static long video_caps;
874
875 /* Parse cmdline, dmi and acpi only once */
876 mutex_lock(&init_mutex);
877 if (!init_done) {
878 acpi_video_parse_cmdline();
879 dmi_check_system(video_detect_dmi_table);
880 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
881 ACPI_UINT32_MAX, find_video, NULL,
882 &video_caps, NULL);
883 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
884 apple_gmux_present = apple_gmux_detect(NULL, NULL);
885 init_done = true;
886 }
887 if (native)
888 native_available = true;
889 mutex_unlock(&init_mutex);
890
891 if (auto_detect)
892 *auto_detect = false;
893
894 /*
895 * The below heuristics / detection steps are in order of descending
896 * presedence. The commandline takes presedence over anything else.
897 */
898 if (acpi_backlight_cmdline != acpi_backlight_undef)
899 return acpi_backlight_cmdline;
900
901 /* DMI quirks override any autodetection. */
902 if (acpi_backlight_dmi != acpi_backlight_undef)
903 return acpi_backlight_dmi;
904
905 if (auto_detect)
906 *auto_detect = true;
907
908 /* Special cases such as nvidia_wmi_ec and apple gmux. */
909 if (nvidia_wmi_ec_present)
910 return acpi_backlight_nvidia_wmi_ec;
911
912 if (apple_gmux_present)
913 return acpi_backlight_apple_gmux;
914
915 /* Use ACPI video if available, except when native should be preferred. */
916 if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
917 !(native_available && prefer_native_over_acpi_video()))
918 return acpi_backlight_video;
919
920 /* Use native if available */
921 if (native_available)
922 return acpi_backlight_native;
923
924 /*
925 * The vendor specific BIOS interfaces are only necessary for
926 * laptops from before ~2008.
927 *
928 * For laptops from ~2008 till ~2023 this point is never reached
929 * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
930 *
931 * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
932 * if this point is reached on those, this likely means that
933 * the GPU kms driver which sets native_available has not loaded yet.
934 *
935 * Returning acpi_backlight_vendor in this case is known to sometimes
936 * cause a non working vendor specific /sys/class/backlight device to
937 * get registered.
938 *
939 * Return acpi_backlight_none on laptops with ACPI tables written
940 * for Windows 8 (laptops from after ~2012) to avoid this problem.
941 */
942 if (acpi_osi_is_win8())
943 return acpi_backlight_none;
944
945 /* No ACPI video/native (old hw), use vendor specific fw methods. */
946 return acpi_backlight_vendor;
947 }
948 EXPORT_SYMBOL(__acpi_video_get_backlight_type);
949