kernel.git/drivers/acpi/video_detect.c, branch linux-5.4.y

ACPI: video: force native for Lenovo 82K8

2025-12-03T11:45:07Z

[ Upstream commit f144bc21befdcf8e54d2f19b23b4e84f13be01f9 ] Lenovo 82K8 has a broken brightness control provided by nvidia_wmi_ec. Add a quirk to prevent using it. Reported-by: Wilson Alvarez Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4512 Tested-by: Wilson Alvarez Signed-off-by: Mario Limonciello (AMD) Link: https://patch.msgid.link/20250820170927.895573-1-superm1@kernel.org Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

ACPI: video: Add backlight=native DMI quirk for Lenovo Ideapad Z470

2023-09-23T09:00:03Z

[ Upstream commit 96b709be183c56293933ef45b8b75f8af268c6de ] The Lenovo Ideapad Z470 predates Windows 8, so it defaults to using acpi_video for backlight control. But this is not functional on this model. Add a DMI quirk to use the native backlight interface which works. Link: https://bugzilla.suse.com/show_bug.cgi?id=1208724 Signed-off-by: Jiri Slaby (SUSE) Reviewed-by: Hans de Goede Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

ACPI: video: Fix Lenovo Ideapad Z570 DMI match

2023-03-11T15:43:56Z

[ Upstream commit 2d11eae42d52a131f06061015e49dc0f085c5bfc ] Multiple Ideapad Z570 variants need acpi_backlight=native to force native use on these pre Windows 8 machines since acpi_video backlight control does not work here. The original DMI quirk matches on a product_name of "102434U" but other variants may have different product_name-s such as e.g. "1024D9U". Move to checking product_version instead as is more or less standard for Lenovo DMI quirks for similar reasons. Signed-off-by: Hans de Goede Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

ACPI: video: Force backlight native for more TongFang devices

2022-10-29T08:20:36Z

commit 3dbc80a3e4c55c4a5b89ef207bed7b7de36157b4 upstream. This commit is very different from the upstream commit! It fixes the same issue by adding more quirks, rather then the general fix from the 6.1 kernel, because the general fix from the 6.1 kernel is part of a larger refactoring of the backlight code which is not suitable for the stable series. As described in "ACPI: video: Drop NL5x?U, PF4NU1F and PF5?U?? acpi_backlight=native quirks" (10212754a0d2) the upstream commit "ACPI: video: Make backlight class device registration a separate step (v2)" (3dbc80a3e4c5) makes these quirks unnecessary. However as mentioned in this bugtracker ticket https://bugzilla.kernel.org/show_bug.cgi?id=215683#c17 the upstream fix is part of a larger patchset that is overall too complex for stable. The TongFang GKxNRxx, GMxNGxx, GMxZGxx, and GMxRGxx / TUXEDO Stellaris/Polaris Gen 1-4, have the same problem as the Clevo NL5xRU and NL5xNU / TUXEDO Aura 15 Gen1 and Gen2: They have a working native and video interface for screen backlight. However the default detection mechanism first registers the video interface before unregistering it again and switching to the native interface during boot. This results in a dangling SBIOS request for backlight change for some reason, causing the backlight to switch to ~2% once per boot on the first power cord connect or disconnect event. Setting the native interface explicitly circumvents this buggy behaviour by avoiding the unregistering process. Reviewed-by: Hans de Goede Signed-off-by: Werner Sembach Signed-off-by: Greg Kroah-Hartman

ACPI: video: Shortening quirk list by identifying Clevo by board_name only

2022-08-11T10:57:50Z

commit f0341e67b3782603737f7788e71bd3530012a4f4 upstream. Taking a recent change in the i8042 quirklist to this one: Clevo board_names are somewhat unique, and if not: The generic Board_-/Sys_Vendor string "Notebook" doesn't help much anyway. So identifying the devices just by the board_name helps keeping the list significantly shorter and might even hit more devices requiring the fix. Signed-off-by: Werner Sembach Fixes: c844d22fe0c0 ("ACPI: video: Force backlight native for Clevo NL5xRU and NL5xNU") Cc: All applicable Reviewed-by: Hans de Goede Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman

ACPI: video: Force backlight native for some TongFang devices

2022-08-11T10:57:50Z

commit c752089f7cf5b5800c6ace4cdd1a8351ee78a598 upstream. The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10, Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2: They have a working native and video interface. However the default detection mechanism first registers the video interface before unregistering it again and switching to the native interface during boot. This results in a dangling SBIOS request for backlight change for some reason, causing the backlight to switch to ~2% once per boot on the first power cord connect or disconnect event. Setting the native interface explicitly circumvents this buggy behaviour by avoiding the unregistering process. Signed-off-by: Werner Sembach Cc: All applicable Reviewed-by: Hans de Goede Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman

ACPI: video: Force backlight native for Clevo NL5xRU and NL5xNU

2022-03-28T06:46:47Z

commit c844d22fe0c0b37dc809adbdde6ceb6462c43acf upstream. Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2 have both a working native and video interface. However the default detection mechanism first registers the video interface before unregistering it again and switching to the native interface during boot. This results in a dangling SBIOS request for backlight change for some reason, causing the backlight to switch to ~2% once per boot on the first power cord connect or disconnect event. Setting the native interface explicitly circumvents this buggy behaviour by avoiding the unregistering process. Signed-off-by: Werner Sembach Cc: All applicable Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman

ACPI: video: Add missing callback back for Sony VPCEH3U1E

2021-03-30T12:35:23Z

commit c1d1e25a8c542816ae8dee41b81a18d30c7519a0 upstream. The .callback of the quirk for Sony VPCEH3U1E was unintetionally removed by the commit 25417185e9b5 ("ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807"). Add it back to make sure the quirk for Sony VPCEH3U1E works as expected. Fixes: 25417185e9b5 ("ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807") Signed-off-by: Chris Chiu Reported-by: Pavel Machek Reviewed-by: Pavel Machek (CIP) Cc: 5.11+ # 5.11+ Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman

ACPI: video: Add DMI quirk for GIGABYTE GB-BXBT-2807

2021-03-11T13:06:50Z

[ Upstream commit 25417185e9b5ff90746d50769d2a3fcd1629e254 ] The GIGABYTE GB-BXBT-2807 is a mini-PC which uses off the shelf components, like an Intel GPU which is meant for mobile systems. As such, it, by default, has a backlight controller exposed. Unfortunately, the backlight controller only confuses userspace, which sees the existence of a backlight device node and has the unrealistic belief that there is actually a backlight there! Add a DMI quirk to force the backlight off on this system. Signed-off-by: Jasper St. Pierre Reviewed-by: Chris Chiu Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

ACPI: video: use ACPI backlight for HP 635 Notebook

2020-11-05T10:43:25Z

commit b226faab4e7890bbbccdf794e8b94276414f9058 upstream. The default backlight interface is AMD's radeon_bl0 which does not work on this system, so use the ACPI backlight interface on it instead. BugLink: https://bugs.launchpad.net/bugs/1894667 Cc: All applicable Signed-off-by: Alex Hung [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman