https://bugzilla.kernel.org/show_bug.cgi?id=207835
Bug ID: 207835
Summary: ACPI video backlight brightness control does not work
on Acer TravelMate 5735Z by default
Product: ACPI
Version: 2.5
Kernel Version: 5.6.7
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: acpi_ot...@kernel-bugs.osdl.org
Reporter: pmenzel+bugzilla.kernel....@molgen.mpg.de
Regression: No
On the Intel GM45/GMA 4500MHD laptop with Debian Sid/unstable and Linux 5.6.7
and GNOME Shell 3.36.2, trying to change the brightness of the internal display
using the function keys, GNOME shows the OSD, which seems to have five levels
(from acer_wmi?), but the actual brightness does *not* change. There is only
`/sys/class/backlight/intel_backlight/brightness` though, and writing values to
it seems to work.
Booting the system with `acpi_backlight=vendor`, exposes
`/sys/devices/platform/acer-wmi/backlight/acer-wmi/brightness`, but the
behavior is the same.
Booting the system with `acpi_backlight=native` or `acpi_backlight=native`,
changing the brightness with the function keys works, and there now seem to be
15 (or 16) levels.
```
$ grep '.*' /sys/class/dmi/id/*_* 2> /dev/null
/sys/class/dmi/id/bios_date:07/26/2011
/sys/class/dmi/id/bios_vendor:Acer
/sys/class/dmi/id/bios_version:V1.14
/sys/class/dmi/id/board_asset_tag:Base Board Asset Tag
/sys/class/dmi/id/board_name:BA51_MV
/sys/class/dmi/id/board_vendor:Acer
/sys/class/dmi/id/board_version:V1.14
/sys/class/dmi/id/chassis_asset_tag:
/sys/class/dmi/id/chassis_type:10
/sys/class/dmi/id/chassis_vendor:Acer
/sys/class/dmi/id/chassis_version:V1.14
/sys/class/dmi/id/product_family:Intel_Mobile
/sys/class/dmi/id/product_name:TravelMate 5735Z
/sys/class/dmi/id/product_sku:Montevina_Fab
/sys/class/dmi/id/product_version:V1.14
/sys/class/dmi/id/sys_vendor:Acer
```
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