Screen sometimes jumps to full brightness on resume from suspend
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Won't Fix
|
Medium
|
|||
linux (Ubuntu) |
Incomplete
|
Medium
|
Unassigned |
Bug Description
At night, I usually turn my brightness down as far as it will go using the brightness keys. This makes it dim, but visible and not off. When I walk away for a while, the screen goes to sleep, and when I come back and move the mouse, the screen jumps to full brightness, which is very unpleasant at night. Investigating, it seems that the brightness in intel_backlight is getting reset to 4437, but the one in acpi_video0 reads 0.
$ for file in brightness max_brightness actual_brightness;
> do
> for directory in /sys/class/
> do
> echo $directory$file : $(cat $directory$file)
> done
> done
/sys/
/sys/
/sys/
/sys/
/sys/
/sys/
After I press the button to increase the brightness one notch, they are back in sync, and then I can turn it back down as well.
$ for file in brightness max_brightness actual_brightness;
> do
> for directory in /sys/class/
> do
> echo $directory$file : $(cat $directory$file)
> done
> done
/sys/
/sys/
/sys/
/sys/
/sys/
/sys/
This is on a fresh install of xubuntu 18.04. Seems like a regression from 16.04, which I ran on the same laptop without this issue.
description: | updated |
Changed in xfce4-power-manager (Ubuntu): | |
status: | New → Incomplete |
Changed in xfce4-power-manager (Ubuntu): | |
status: | Expired → Incomplete |
affects: | xfce4-power-manager (Ubuntu) → linux (Ubuntu) |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Incomplete |
Changed in linux: | |
status: | Incomplete → Won't Fix |
Does the following command trigger this issue?
xset dpms force standby
Furthermore, are there any related messages in the `dmesg` output?