This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1915082
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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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