[Bug 216119] 087451f372bf76d breaks hibernation on amdgpu Radeon R9 390

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216119

--- Comment #48 from Harald Judt (h.judt@gmx.at) ---
Ok. I am quite sure about this, but I have new observations which could mean
that the hibernation issue could be fixed but there is another issue.

First, I have tried 6.1.0. Hibernation/resume seems to work as long as I do not
VT switch, causing the ring gfx timeout but soft recovered messages and fences
timed out. I have not tested this thoroughly enough though.

Second, the
amdgpu: GPU fault detected: 146 0x0006c40c
amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000000
amdgpu:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x060C400C
amdgpu: VM fault (0x0c, vmid 3, pasid 0) at page 0, read from 'TC7'
(0x54433700) (196)
and similar messages also happen with 5.18.19 when VT-switching, though *much*
more rarely.

It seems these remaining problems are likely more related to VT-switching than
having to do with hibernate/resume now. Maybe the new fb code or other changes
in the driver just cause these problems to happen more often?

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