Public bug reported:
Backlight controls do not have any effect on a Macbook7,1 running Ubuntu 18.04.
Ubuntu is installed in Legacy BIOS mode and uses the proprietary Nvidia drivers.
The apple_backlight directory appears in /sys/class/backlight and while
different brightness values can be set, they have no effect on the backlight's
emitted brightness.
The backlight remains at full brightness.
I have tested the following kernel parameters but they have no effect.
acpi_backlight=vendor
video.use_bios_initial_backlight=0
acpi_osi=
video.use_native_backlight=1
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Attachment added: "acpi_backlight=vendor ls sys-class-backlight"
https://bugs.launchpad.net/bugs/1915082/+attachment/5461419/+files/acpi_backlight%3Dvendor%20ls%20sys-class-backlight
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https://bugs.launchpad.net/bugs/1915082
Title:
[Macbook7,1] backlight not working
Status in linux package in Ubuntu:
Incomplete
Bug description:
Backlight controls do not have any effect on a Macbook7,1 running Ubuntu
18.04.
Ubuntu is installed in Legacy BIOS mode and uses the proprietary Nvidia
drivers.
The apple_backlight directory appears in /sys/class/backlight and while
different brightness values can be set, they have no effect on the backlight's
emitted brightness.
The backlight remains at full brightness.
I have tested the following kernel parameters but they have no effect.
acpi_backlight=vendor
video.use_bios_initial_backlight=0
acpi_osi=
video.use_native_backlight=1
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