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Bug#989010: linux-image-5.10.0-7-amd64: No display (post, grub, boot messages and desktop) after the upgrade to 5.10.38

Cross-posted to 2 groups.

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Source: linux
Followup-For: Bug #989010
X-Debbugs-Cc: pitsiorisj@outlook.com

Preface: In case I did not mention it above, I had a suspicion that the issue
might be related to cpu frequency scaling.

1+ month has passed with 5.15. The blank screen issue appeared a few more times
the following days. A couple of days later, I decided to disable cpufrequtils,
which set my frequency scheduler to schedutil (from ondemand). And the issue
has not happened since then!

Then I checked debian wiki, which says that cpufrequtils is replaced in favor
of cpupower, so I removed it completely and installed cpupower (linux-cpupower
package).
However, cpupower in debian does not come with a systemd service and it does
not have /etc/default/cpupower so as to set a desired governor.
I really need such functionality, because as I have said, I set my governor to
powersave from May to September every year and now I have no way to.


-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.15.0-3-amd64 (SMP w/2 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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Bug#989010: linux-image-5.10.0-7-amd64: No display (post, grub, boot messages and desktop) after the upgrade to 5.10.38 jim_p <pitsiorisj@outlook.com> - 2022-02-03 18:10 +0100
  Bug#989010: linux-image-5.10.0-7-amd64: No display (post, grub, boot messages and desktop) after the upgrade to 5.10.38 Diederik de Haas <didi.debian@cknow.org> - 2022-02-03 19:10 +0100

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