Public bug reported:
The key shortcuts as well as slider controls in GNOME for setting the
brightness of the screen on a amdgpu_bl1 laptop stops working after a
sleep/resume cycle. The GNOME logs are the following after pressing the
brightness increase and decrease Fn keys on the keyboard:
12:46:37 (sd-bright): amdgpu_bl1: Failed to write brightness to device: Invalid
argument
12:46:37 gsd-power: gsd_power_backlight_abs_to_percentage: assertion 'max >
min' failed
12:46:36 (sd-bright): amdgpu_bl1: Failed to write brightness to device: Invalid
argument
12:46:36 gsd-power: gsd_power_backlight_abs_to_percentage: assertion 'max >
min' failed
12:46:36 (sd-bright): amdgpu_bl1: Failed to write brightness to device: Invalid
argument
12:46:36 gsd-power: gsd_power_backlight_abs_to_percentage: assertion 'max >
min' failed
12:46:35 (sd-bright): amdgpu_bl1: Failed to write brightness to device: Invalid
argument
12:46:35 gsd-power: gsd_power_backlight_abs_to_percentage: assertion 'max >
min' failed
12:46:34 (sd-bright): amdgpu_bl1: Failed to write brightness to device: Invalid
argument
12:46:34 gsd-power: gsd_power_backlight_abs_to_percentage: assertion 'max >
min' failed
Setting the backlight manually using the sysfs interface or the gsd-
backlight-helper program still works:
$ sudo strace /usr/libexec/gsd-backlight-helper /sys/class/backlight/amdgpu_bl1
15
...
openat(AT_FDCWD, "/sys/class/backlight/amdgpu_bl1/brightness", O_WRONLY) = 4
write(4, "15", 2) = 2
close(4) = 0
This is why I am filing this bug against gnome-settings-daemon and not
the kernel.
** Affects: gnome-settings-daemon (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2081294
Title:
amdgpu_bl1: brightness control stops working after sleep/resume
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