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/types.h> 38 #include <linux/workqueue.h> 39 #include <acpi/video.h> 40 41 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; 42 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; 43 44 static void acpi_video_parse_cmdline(void) 45 { 46 if (!strcmp("vendor", acpi_video_backlight_string)) 47 acpi_backlight_cmdline = acpi_backlight_vendor; 48 if (!strcmp("video", acpi_video_backlight_string)) 49 acpi_backlight_cmdline = acpi_backlight_video; 50 if (!strcmp("native", acpi_video_backlight_string)) 51 acpi_backlight_cmdline = acpi_backlight_native; 52 if (!strcmp("none", acpi_video_backlight_string)) 53 acpi_backlight_cmdline = acpi_backlight_none; 54 } 55 56 static acpi_status 57 find_video(acpi_handle handle, u32 lvl, void *context, void **rv) 58 { 59 struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle); 60 long *cap = context; 61 struct pci_dev *dev; 62 63 static const struct acpi_device_id video_ids[] = { 64 {ACPI_VIDEO_HID, 0}, 65 {"", 0}, 66 }; 67 68 if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) { 69 dev = acpi_get_pci_dev(handle); 70 if (!dev) 71 return AE_OK; 72 pci_dev_put(dev); 73 *cap |= acpi_is_video_device(handle); 74 } 75 return AE_OK; 76 } 77 78 /* This depends on ACPI_WMI which is X86 only */ 79 #ifdef CONFIG_X86 80 static bool nvidia_wmi_ec_supported(void) 81 { 82 struct wmi_brightness_args args = { 83 .mode = WMI_BRIGHTNESS_MODE_GET, 84 .val = 0, 85 .ret = 0, 86 }; 87 struct acpi_buffer buf = { (acpi_size)sizeof(args), &args }; 88 acpi_status status; 89 90 status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0, 91 WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf); 92 if (ACPI_FAILURE(status)) 93 return false; 94 95 /* 96 * If brightness is handled by the EC then nvidia-wmi-ec-backlight 97 * should be used, else the GPU driver(s) should be used. 98 */ 99 return args.ret == WMI_BRIGHTNESS_SOURCE_EC; 100 } 101 #else 102 static bool nvidia_wmi_ec_supported(void) 103 { 104 return false; 105 } 106 #endif 107 108 /* Force to use vendor driver when the ACPI device is known to be 109 * buggy */ 110 static int video_detect_force_vendor(const struct dmi_system_id *d) 111 { 112 acpi_backlight_dmi = acpi_backlight_vendor; 113 return 0; 114 } 115 116 static int video_detect_force_video(const struct dmi_system_id *d) 117 { 118 acpi_backlight_dmi = acpi_backlight_video; 119 return 0; 120 } 121 122 static int video_detect_force_native(const struct dmi_system_id *d) 123 { 124 acpi_backlight_dmi = acpi_backlight_native; 125 return 0; 126 } 127 128 static int video_detect_force_none(const struct dmi_system_id *d) 129 { 130 acpi_backlight_dmi = acpi_backlight_none; 131 return 0; 132 } 133 134 static const struct dmi_system_id video_detect_dmi_table[] = { 135 { 136 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */ 137 .callback = video_detect_force_vendor, 138 /* Acer KAV80 */ 139 .matches = { 140 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 141 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"), 142 }, 143 }, 144 { 145 .callback = video_detect_force_vendor, 146 /* Asus UL30VT */ 147 .matches = { 148 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 149 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), 150 }, 151 }, 152 { 153 .callback = video_detect_force_vendor, 154 /* Asus UL30A */ 155 .matches = { 156 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 157 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), 158 }, 159 }, 160 { 161 .callback = video_detect_force_vendor, 162 /* Asus X55U */ 163 .matches = { 164 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 165 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"), 166 }, 167 }, 168 { 169 .callback = video_detect_force_vendor, 170 /* Asus X101CH */ 171 .matches = { 172 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 173 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"), 174 }, 175 }, 176 { 177 .callback = video_detect_force_vendor, 178 /* Asus X401U */ 179 .matches = { 180 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 181 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"), 182 }, 183 }, 184 { 185 .callback = video_detect_force_vendor, 186 /* Asus X501U */ 187 .matches = { 188 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 189 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"), 190 }, 191 }, 192 { 193 .callback = video_detect_force_vendor, 194 /* Asus 1015CX */ 195 .matches = { 196 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 197 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"), 198 }, 199 }, 200 { 201 .callback = video_detect_force_vendor, 202 /* GIGABYTE GB-BXBT-2807 */ 203 .matches = { 204 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), 205 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"), 206 }, 207 }, 208 { 209 .callback = video_detect_force_vendor, 210 /* Samsung N150/N210/N220 */ 211 .matches = { 212 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 213 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"), 214 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"), 215 }, 216 }, 217 { 218 .callback = video_detect_force_vendor, 219 /* Samsung NF110/NF210/NF310 */ 220 .matches = { 221 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 222 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"), 223 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"), 224 }, 225 }, 226 { 227 .callback = video_detect_force_vendor, 228 /* Samsung NC210 */ 229 .matches = { 230 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 231 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"), 232 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"), 233 }, 234 }, 235 { 236 .callback = video_detect_force_vendor, 237 /* Sony VPCEH3U1E */ 238 .matches = { 239 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 240 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), 241 }, 242 }, 243 { 244 .callback = video_detect_force_vendor, 245 /* Xiaomi Mi Pad 2 */ 246 .matches = { 247 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), 248 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), 249 }, 250 }, 251 252 /* 253 * Toshiba models with Transflective display, these need to use 254 * the toshiba_acpi vendor driver for proper Transflective handling. 255 */ 256 { 257 .callback = video_detect_force_vendor, 258 .matches = { 259 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 260 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"), 261 }, 262 }, 263 { 264 .callback = video_detect_force_vendor, 265 .matches = { 266 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 267 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"), 268 }, 269 }, 270 271 /* 272 * These models have a working acpi_video backlight control, and using 273 * native backlight causes a regression where backlight does not work 274 * when userspace is not handling brightness key events. Disable 275 * native_backlight on these to fix this: 276 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 277 */ 278 { 279 .callback = video_detect_force_video, 280 /* ThinkPad T420 */ 281 .matches = { 282 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 283 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 284 }, 285 }, 286 { 287 .callback = video_detect_force_video, 288 /* ThinkPad T520 */ 289 .matches = { 290 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 291 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 292 }, 293 }, 294 { 295 .callback = video_detect_force_video, 296 /* ThinkPad X201s */ 297 .matches = { 298 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 299 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 300 }, 301 }, 302 { 303 .callback = video_detect_force_video, 304 /* ThinkPad X201T */ 305 .matches = { 306 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 307 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 308 }, 309 }, 310 311 /* The native backlight controls do not work on some older machines */ 312 { 313 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 314 .callback = video_detect_force_video, 315 /* HP ENVY 15 Notebook */ 316 .matches = { 317 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 318 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 319 }, 320 }, 321 { 322 .callback = video_detect_force_video, 323 /* SAMSUNG 870Z5E/880Z5E/680Z5E */ 324 .matches = { 325 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 326 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 327 }, 328 }, 329 { 330 .callback = video_detect_force_video, 331 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */ 332 .matches = { 333 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 334 DMI_MATCH(DMI_PRODUCT_NAME, 335 "370R4E/370R4V/370R5E/3570RE/370R5V"), 336 }, 337 }, 338 { 339 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 340 .callback = video_detect_force_video, 341 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */ 342 .matches = { 343 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 344 DMI_MATCH(DMI_PRODUCT_NAME, 345 "3570R/370R/470R/450R/510R/4450RV"), 346 }, 347 }, 348 { 349 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ 350 .callback = video_detect_force_video, 351 /* SAMSUNG 670Z5E */ 352 .matches = { 353 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 354 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), 355 }, 356 }, 357 { 358 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 359 .callback = video_detect_force_video, 360 /* SAMSUNG 730U3E/740U3E */ 361 .matches = { 362 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 363 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 364 }, 365 }, 366 { 367 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 368 .callback = video_detect_force_video, 369 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */ 370 .matches = { 371 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 372 DMI_MATCH(DMI_PRODUCT_NAME, 373 "900X3C/900X3D/900X3E/900X4C/900X4D"), 374 }, 375 }, 376 { 377 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 378 .callback = video_detect_force_video, 379 /* Dell XPS14 L421X */ 380 .matches = { 381 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 382 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 383 }, 384 }, 385 { 386 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 387 .callback = video_detect_force_video, 388 /* Dell XPS15 L521X */ 389 .matches = { 390 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 391 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 392 }, 393 }, 394 { 395 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 396 .callback = video_detect_force_video, 397 /* SAMSUNG 530U4E/540U4E */ 398 .matches = { 399 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 400 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 401 }, 402 }, 403 /* https://bugs.launchpad.net/bugs/1894667 */ 404 { 405 .callback = video_detect_force_video, 406 /* HP 635 Notebook */ 407 .matches = { 408 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 409 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), 410 }, 411 }, 412 413 /* Non win8 machines which need native backlight nevertheless */ 414 { 415 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 416 .callback = video_detect_force_native, 417 /* Lenovo Ideapad S405 */ 418 .matches = { 419 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 420 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 421 }, 422 }, 423 { 424 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 425 .callback = video_detect_force_native, 426 /* Lenovo Ideapad Z570 */ 427 .matches = { 428 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 429 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 430 }, 431 }, 432 { 433 .callback = video_detect_force_native, 434 /* Lenovo E41-25 */ 435 .matches = { 436 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 437 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 438 }, 439 }, 440 { 441 .callback = video_detect_force_native, 442 /* Lenovo E41-45 */ 443 .matches = { 444 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 445 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 446 }, 447 }, 448 { 449 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 450 .callback = video_detect_force_native, 451 /* Apple MacBook Pro 12,1 */ 452 .matches = { 453 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 454 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 455 }, 456 }, 457 { 458 .callback = video_detect_force_native, 459 /* Dell Inspiron N4010 */ 460 .matches = { 461 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 462 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"), 463 }, 464 }, 465 { 466 .callback = video_detect_force_native, 467 /* Dell Vostro V131 */ 468 .matches = { 469 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 470 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 471 }, 472 }, 473 { 474 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 475 .callback = video_detect_force_native, 476 /* Dell XPS 17 L702X */ 477 .matches = { 478 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 479 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 480 }, 481 }, 482 { 483 .callback = video_detect_force_native, 484 /* Dell Precision 7510 */ 485 .matches = { 486 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 487 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 488 }, 489 }, 490 { 491 .callback = video_detect_force_native, 492 /* Acer Aspire 5738z */ 493 .matches = { 494 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 495 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 496 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 497 }, 498 }, 499 { 500 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */ 501 .callback = video_detect_force_native, 502 /* Acer Aspire 5741 */ 503 .matches = { 504 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 505 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"), 506 }, 507 }, 508 { 509 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */ 510 .callback = video_detect_force_native, 511 /* Acer Aspire 5750 */ 512 .matches = { 513 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 514 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"), 515 }, 516 }, 517 { 518 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */ 519 .callback = video_detect_force_native, 520 /* Acer Extensa 5235 */ 521 .matches = { 522 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 523 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"), 524 }, 525 }, 526 { 527 .callback = video_detect_force_native, 528 /* Acer TravelMate 4750 */ 529 .matches = { 530 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 531 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"), 532 }, 533 }, 534 { 535 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 536 .callback = video_detect_force_native, 537 /* Acer TravelMate 5735Z */ 538 .matches = { 539 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 540 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 541 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 542 }, 543 }, 544 { 545 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */ 546 .callback = video_detect_force_native, 547 /* Acer TravelMate 5760 */ 548 .matches = { 549 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 550 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"), 551 }, 552 }, 553 { 554 .callback = video_detect_force_native, 555 /* ASUSTeK COMPUTER INC. GA401 */ 556 .matches = { 557 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 558 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), 559 }, 560 }, 561 { 562 .callback = video_detect_force_native, 563 /* ASUSTeK COMPUTER INC. GA502 */ 564 .matches = { 565 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 566 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), 567 }, 568 }, 569 { 570 .callback = video_detect_force_native, 571 /* ASUSTeK COMPUTER INC. GA503 */ 572 .matches = { 573 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 574 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), 575 }, 576 }, 577 { 578 .callback = video_detect_force_native, 579 /* Asus UX303UB */ 580 .matches = { 581 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 582 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"), 583 }, 584 }, 585 { 586 .callback = video_detect_force_native, 587 /* Samsung N150P */ 588 .matches = { 589 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 590 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"), 591 DMI_MATCH(DMI_BOARD_NAME, "N150P"), 592 }, 593 }, 594 { 595 .callback = video_detect_force_native, 596 /* Samsung N145P/N250P/N260P */ 597 .matches = { 598 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 599 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"), 600 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"), 601 }, 602 }, 603 { 604 .callback = video_detect_force_native, 605 /* Samsung N250P */ 606 .matches = { 607 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 608 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"), 609 DMI_MATCH(DMI_BOARD_NAME, "N250P"), 610 }, 611 }, 612 613 /* 614 * These Toshibas have a broken acpi-video interface for brightness 615 * control. They also have an issue where the panel is off after 616 * suspend until a special firmware call is made to turn it back 617 * on. This is handled by the toshiba_acpi kernel module, so that 618 * module must be enabled for these models to work correctly. 619 */ 620 { 621 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 622 .callback = video_detect_force_native, 623 /* Toshiba Portégé R700 */ 624 .matches = { 625 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 626 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 627 }, 628 }, 629 { 630 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 631 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 632 .callback = video_detect_force_native, 633 /* Toshiba Satellite/Portégé R830 */ 634 .matches = { 635 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 636 DMI_MATCH(DMI_PRODUCT_NAME, "R830"), 637 }, 638 }, 639 { 640 .callback = video_detect_force_native, 641 /* Toshiba Satellite/Portégé Z830 */ 642 .matches = { 643 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 644 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"), 645 }, 646 }, 647 648 /* 649 * Desktops which falsely report a backlight and which our heuristics 650 * for this do not catch. 651 */ 652 { 653 .callback = video_detect_force_none, 654 /* Dell OptiPlex 9020M */ 655 .matches = { 656 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 657 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 658 }, 659 }, 660 { 661 .callback = video_detect_force_none, 662 /* MSI MS-7721 */ 663 .matches = { 664 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 665 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 666 }, 667 }, 668 { }, 669 }; 670 671 static bool google_cros_ec_present(void) 672 { 673 return acpi_dev_found("GOOG0004"); 674 } 675 676 /* 677 * Determine which type of backlight interface to use on this system, 678 * First check cmdline, then dmi quirks, then do autodetect. 679 */ 680 static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native) 681 { 682 static DEFINE_MUTEX(init_mutex); 683 static bool nvidia_wmi_ec_present; 684 static bool native_available; 685 static bool init_done; 686 static long video_caps; 687 688 /* Parse cmdline, dmi and acpi only once */ 689 mutex_lock(&init_mutex); 690 if (!init_done) { 691 acpi_video_parse_cmdline(); 692 dmi_check_system(video_detect_dmi_table); 693 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 694 ACPI_UINT32_MAX, find_video, NULL, 695 &video_caps, NULL); 696 nvidia_wmi_ec_present = nvidia_wmi_ec_supported(); 697 init_done = true; 698 } 699 if (native) 700 native_available = true; 701 mutex_unlock(&init_mutex); 702 703 /* 704 * The below heuristics / detection steps are in order of descending 705 * presedence. The commandline takes presedence over anything else. 706 */ 707 if (acpi_backlight_cmdline != acpi_backlight_undef) 708 return acpi_backlight_cmdline; 709 710 /* DMI quirks override any autodetection. */ 711 if (acpi_backlight_dmi != acpi_backlight_undef) 712 return acpi_backlight_dmi; 713 714 /* Special cases such as nvidia_wmi_ec and apple gmux. */ 715 if (nvidia_wmi_ec_present) 716 return acpi_backlight_nvidia_wmi_ec; 717 718 if (apple_gmux_present()) 719 return acpi_backlight_apple_gmux; 720 721 /* On systems with ACPI video use either native or ACPI video. */ 722 if (video_caps & ACPI_VIDEO_BACKLIGHT) { 723 /* 724 * Windows 8 and newer no longer use the ACPI video interface, 725 * so it often does not work. If the ACPI tables are written 726 * for win8 and native brightness ctl is available, use that. 727 * 728 * The native check deliberately is inside the if acpi-video 729 * block on older devices without acpi-video support native 730 * is usually not the best choice. 731 */ 732 if (acpi_osi_is_win8() && native_available) 733 return acpi_backlight_native; 734 else 735 return acpi_backlight_video; 736 } 737 738 /* 739 * Chromebooks that don't have backlight handle in ACPI table 740 * are supposed to use native backlight if it's available. 741 */ 742 if (google_cros_ec_present() && native_available) 743 return acpi_backlight_native; 744 745 /* No ACPI video (old hw), use vendor specific fw methods. */ 746 return acpi_backlight_vendor; 747 } 748 749 enum acpi_backlight_type acpi_video_get_backlight_type(void) 750 { 751 return __acpi_video_get_backlight_type(false); 752 } 753 EXPORT_SYMBOL(acpi_video_get_backlight_type); 754 755 bool acpi_video_backlight_use_native(void) 756 { 757 return __acpi_video_get_backlight_type(true) == acpi_backlight_native; 758 } 759 EXPORT_SYMBOL(acpi_video_backlight_use_native); 760