ACPI: video: Force backlight native for more TongFang devices
stable inclusion from stable-v5.10.152 commit 67dafece56b6e78ccf956064b50f08c80dd6134e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I73HJ0 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=67dafece56b6e78ccf956064b50f08c80dd6134e -------------------------------- commit 3dbc80a3 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" (10212754) the upstream commit "ACPI: video: Make backlight class device registration a separate step (v2)" (3dbc80a3) 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 <hdegoede@redhat.com> Signed-off-by:
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