This issue is no longer present in Ubuntu 22.04. Wile using Ubuntu 21.10, the
following workarounds also remedied the issue:
- Run a mainline 5.15.x kernel from
https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D
- Run the Jammy Jellyfish kernel from
https://packages.ubuntu.com/jammy/linux-i
I compiled several Ubuntu-5.13.0-x.x tags from
https://kernel.ubuntu.com/git/ubuntu/ubuntu-impish.git/refs/ but the backlight
issue seems to go far back in time. I tested:
- Ubuntu-5.13.0-25.26
- Ubuntu-5.13.0-21.21
- Ubuntu-5.13.0-20.20
- Ubuntu-5.13.0-19.19
- Ubuntu-5.13.0-16.16
In Ubuntu-5.13
I just tested signed Ubuntu kernel 5.13.0-28-generic which is in
Proposed right now, but it does not fix the issue. Brightness
adjustments work, but service fails during startup and screen is at full
brightness every boot (at gdm and at GNOME 3 desktop).
--
You received this bug notification beca
I tested some mainline 5.13.x kernels from
https://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D and was able to
find a point release where this issue is resolved. Testing results:
Signed Ubuntu kernel 5.13.0-27-generic: brightness adjustments work, but
service fails during startup and screen is
I enabled debug logging for systemd with kernel cmdline:
systemd.log_level=debug systemd.log_target=kmsg log_buf_len=1M printk.devkmsg=on
New log attached to bug report is the output of 'journalctl -b':
systemd-debug.log
Filtering on "backlight" and omitting systemd-logind, this portion looks
int
In case it is helpful to anyone else, I found a resolution for my
specific case. This askubuntu question helped:
https://askubuntu.com/questions/1018907/ubuntu-installation-stuck-at-
random-crng-init-done . In sum: sudo apt install rng-tools
About 1 week ago, my Ubuntu 18.04 boot time went from ~1
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