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