I do have a radeon_bl0 symlink inside /sys/class/backlight/ pointing to a valid
path: /sys/devices/pci:00/:00:01.0/drm/card0/card0-eDP-1/radeon_bl0
I do not use systemd.
Handling of radeon_bl0 is probably an the issue for *another* subsystem,
most probably Xorg, udev or ACPI (= the same
[Expired for systemd (Ubuntu) because there has been no activity for 60
days.]
** Changed in: systemd (Ubuntu)
Status: Incomplete => Expired
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If you think this is a bug in systemd-backlight, the questions in
comment #5 still apply.
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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** Changed in: systemd (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/1450044
Title:
On laptop on card AMD, screen brightness
This bug do exist
- with radeon driver(s) [radeonsi in my case]
- on some AMD hardware (Kaveri [Radeon R5 Graphics])
- is well known and explained:
* https://bbs.archlinux.org/viewtopic.php?id=193130
*
side note: I don't think this bug has anything to do with systemd
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https://bugs.launchpad.net/bugs/1450044
Title:
On laptop on card AMD, screen brightness
[Expired for systemd (Ubuntu) because there has been no activity for 60
days.]
** Changed in: systemd (Ubuntu)
Status: Incomplete => Expired
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Touch seeded packages, which is subscribed to systemd in Ubuntu.
Martin Pitt, excuse me, probably I did not get to collect the necessary
information is now no suitable laptop with an appropriate system.
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OK, thanks. So it seems there is a broken acpi_video0 which doesn't
appear in the grep. Can you please give me the output of
ls -l /sys/class/backlight/
? If that's a broken symlink or so, then systemd-
backlight@backlight:acpi_video0.service is okay to fail. However, there
should be another
Are you using the free driver or the AMD proprietary one?
On the laptop is only free driver supplied with kernel 3.19.
If you press the brightness keys, do you get a notification bubble for that
which shows the current value?
Yes, a notice displayed on the current value of the brightness of
Indeed the log says
апр. 29 15:48:07 username-pc systemd-backlight[442]: Failed to get
backlight or LED device 'backlight:acpi_video0': No such file or
directory
Can you please give me the output of
grep -r . /sys/class/backlight/*
Are you using the free driver or the AMD proprietary one?
Are you using the free driver or the AMD proprietary one?
On the laptop is only free driver supplied with kernel 3.19.
If you press the brightness keys, do you get a notification bubble for that
which shows the current value?
Yes, a notice displayed on the current value of the brightness of
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