Hello all, I've been following recent kernels on this dell laptop for almost a year now to work through some issues with the ath11k module. I've been experiencing random occasional video artifacts for most of that time. These artifacts would cause the i915 module to report some kind of underrun (sorry I don't have those logs any longer). At some point around 5.10 the artifacts turned into full panics that needed a reboot instead of some waiting and jiggling. Kalle reported here: http://lists.infradead.org/pipermail/ath11k/2021-August/001451.html that there was a commit he could revert to fix it. I was unable to reproduce that fix by reverting it. I'm now running 5.14.0 and it seems to have changed behavior again. Instead of the machine hard locking (ie: no caps lock even), it seems to recover after a bit and then I can see this in dmesg: [226387.152234] DMAR: DRHD: handling fault status reg 3 [226387.152244] DMAR: [DMA Write NO_PASID] Request device [0x00:0x02.0] fault addr 0xf0afc000 [fault reason 0x07] Next page table ptr is invalid [226402.058857] i915 0000:00:02.0: [drm] GPU HANG: ecode 12:0:00000000 [226402.058876] i915 0000:00:02.0: [drm] Resetting rcs0 for stopped heartbeat on rcs0 [276353.590922] clocksource: timekeeping watchdog on CPU4: hpet retried 2 times before success <snip, later> [345312.963065] DMAR: DRHD: handling fault status reg 3 [345312.963077] DMAR: [DMA Write NO_PASID] Request device [0x00:0x02.0] fault addr 0xf21ec000 [fault reason 0x07] Next page table ptr is invalid [345323.814583] Asynchronous wait on fence 0000:00:02.0:gnome-shell[2707]:1a15a6 timed out (hint:intel_atomic_commit_ready [i915]) [345327.672581] i915 0000:00:02.0: [drm] GPU HANG: ecode 12:1:85dffffb, in signal-desktop [26051] [345327.672606] i915 0000:00:02.0: [drm] Resetting rcs0 for stopped heartbeat on rcs0 [345327.672656] i915 0000:00:02.0: [drm] signal-desktop[26051] context reset due to GPU hang I'm not sure what the DMAR messages are about, I included them in case they're relevant. How can I debug this further? I'll gladly enable whatever is needed :) Thanks!
