My Thinkpad A275 hangs while going into suspend. The screen turned off, but it does not really enter suspend mode (according to journalctl it started suspending). Even after reboots the screen does not turn on again, I have to power off the Thinkpad and then power it on again. The issue did not exist with 5.14.x.
BTW, iommu is enabled:
[ 0.739887] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
Tested 5.14.16 - ok
Tried 5.15.0 and 5.15.1 -> don't even boot, the first 3 lines look misarranged.
I will try to bisect between 5.14.16 and 5.15.2.
mainline 5.16rc1 is also affected.
It seems it is https://gitlab.freedesktop.org/drm/amd/-/issues/1789
Please include your dmesg output. Does this patch fix it?
Created attachment 299595 [details]
The patch fixes it, thanks.