src/ppd-driver-amd-pstate.c · b467b893bb08e662c708e8ee5d199ba440c2f747 · upower / power-profiles-daemon · GitLab

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6 months ago

amd-pstate: Validate writes work during init · b467b893

Mario Limonciello authored 6 months ago and

Marco Trevisan committed 6 months ago

Due a firmware bug on some OEM systems the amd-pstate kernel driver
starts up in active mode but EPP writes don't work.

Admittedly this is a kernel bug that it still advertises support and
it could be handled better by the kernel, but PPD can also validate
writes with a no-op for each CPU at bootup.

Do this to ensure that the CPU driver is only setup if we know it works.

b467b893

amd-pstate: Validate writes work during init

Mario Limonciello authored 6 months ago and

Marco Trevisan committed 6 months ago

Due a firmware bug on some OEM systems the amd-pstate kernel driver
starts up in active mode but EPP writes don't work.

Admittedly this is a kernel bug that it still advertises support and
it could be handled better by the kernel, but PPD can also validate
writes with a no-op for each CPU at bootup.

Do this to ensure that the CPU driver is only setup if we know it works.