[Bug 89521] New: Radeon driver fails to set dpm power state after resume from S3

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=89521

            Bug ID: 89521
           Summary: Radeon driver fails to set dpm power state after
                    resume from S3
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: anhermann@gmx.net
        Regression: No

Created attachment 160341
  --> https://bugzilla.kernel.org/attachment.cgi?id=160341&action=edit
dmesg output from 3 resume cycles

Using a Radeon R9 270X and kernel 3.18.0 I get the following error message only
after resume from S3 state:

[drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed

I would like to notice that this also happened with older kernel versions (3.17
and 3.16 with radeon.dpm=1) and other cards. My other PC has a HD 5450 with the
same problem (slightly other ERROR string as its not SI).
Besides the error message, I cannot see any strange behaviour, performance is
good, no freezes etc. . But it sounds like performance level switching is not
working correctly?

I added the dmesg output showing three resume cycles with the mentioned error
message as attachment.

Thanks

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