[Bug 67187] Radeon HD6950: UVD not responding, trying to reset the VCPU

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=67187

--- Comment #5 from Harald Judt <h.judt@gmx.at> ---
Created attachment 83279
  --> https://bugs.freedesktop.org/attachment.cgi?id=83279&action=edit
dmesg.out

Ok, I gave it a try with new vanilla 3.11-rc3. It ends with the following error
message, though I'm not sure it isn't simply a follow-up problem caused by
previous errors:

[ 2203.028013] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed
(scratch(0x8504)=0xCAFEDEAD)

As you can deduce from the dmesg.out file attached to the bug report, the first
few tries work ok. The problem seems to be more easily reproducible (but not
restricted to that) when pm_async is enabled. I'm not yet sure it happens with
pm_async off, but by experience, the chances that it does are very likely.

What is a bit strange is that the message "entering sleep state S4" never
appears in the dmesg.out. This _could_ be because I issued "echo reboot >
/sys/power/disk". However, this is about hibernate/resume, as you can see when
you look at the pm messages.

I believe the main problem occurs already at suspend time, because when it
happens, suspend always takes longer than usual, hanging a bit with the monitor
turned off. However, there are no error messages to be found in the log, only
when resuming. Perhaps I should use no_suspend_console and/or net_console.

Also note how the UVD initialization fails, then the machine continues booting
and later you can hibernate again, which will restore UVD but cause the ring 0
failure with CAFEDEAD. At first, the screen is blank, then shows an animated
nostalgic noise picture similar to analog tv that has no reception. The machine
is still responsive and one can ssh in.

Is there perhaps an option to enable for more debugging messages that could
give more insight?

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