[Bug 71051] Cannot suspend with radeon drivers.

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https://bugzilla.kernel.org/show_bug.cgi?id=71051

Thomas J. Moore <darktjm@xxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |darktjm@xxxxxxxxx

--- Comment #16 from Thomas J. Moore <darktjm@xxxxxxxxx> ---
I have a Dell Inspiron with AMD A6 (Advanced Micro Devices, Inc. [AMD/ATI]
Mullins [Radeon R4/R5 Graphics]), and stopped upgrading my kernel at 3.16.3
because it would no longer resume from disk about 90% or more of the time.  I
have finally given in and looked for the cause a bit, and have traced it to
this patch.  Without this patch, 3.18.3 (and probably all other versions I
skipped before it) works fine for me.  That said, I never suspend to memory,
and so I tried with and without, and indeed the patch seems to be necessary for
resume-from-memory on my system as well.  So, while this patch does fix a bug,
it introduces a regression for me.  Is it possible the value of nb_dpm_enabled
is not restored or initialized properly on resume from disk, due to the video
mode change?

The symptoms when resuming from disk are similar to comment 9 (ring test
failures, which do not occur without the patch), with X crashing (and, due to
the fact that I start it in inittab, retrying with "couldn't schedule ib" error
until I reboot or disable the inittab entry).

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