Thank you for the detailed report and analysis. I've confirmed that
e6c5d36756e7 is in 7.0.0-42.42.
There is now an upstream fix for this:
cd883d0a3937 ("drm/amd/pm/si: Check AMD_IS_MOBILITY flag for
PPSMC_SYSTEMFLAG_GPIO_DC")
Fixes: e6c5d36756e7
It clears PPSMC_SYSTEMFLAG_GPIO_DC on desktop GPUs, which matches your
analysis of the DC flag. A related patch, "drm/amd/pm/si: Fix updating
clock limits on AC/DC", was merged alongside it. Both should be picked
up for the Resolute kernel.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/2172815
Title:
SI GPUs stuck at lowest DPM level on Mac Pro 2013 since 7.0.0-41
(drm/amd/pm/si: Fix updating clock limits from power states)
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