[Bug 65761] HD 7970M Hybrid - hangs and errors and rmmod causes crash

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https://bugzilla.kernel.org/show_bug.cgi?id=65761

--- Comment #30 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 124221
  --> https://bugzilla.kernel.org/attachment.cgi?id=124221&action=edit
sysprof with 2 xterm windows and kwin

I still kind of want to try the opposite direction, to find out what X does
that keeps the gpu awake so I'm trying to get a good dynamic call graph. The
first thing that kind of worked is sysprof...

So I started recording this after starting X and two xterms and kwin on the
intel gpu and just clicked a bit between the two because it seems this triggers
whatever happens. The radeon gpu was not even configured as offload slave, just
default X configuration.

If I saw that correctly none of the applications called functions from the
radeon driver which is probably good, but in X you can see this (more detail is
available in the file):

[/usr/bin/X]                                            0,00%  65,99%
  In file [heap]                                        0,00%  29,73%
    ioctl                                               0,18%  16,17%
      - - kernel - -                                    0,00%  15,99%
        system_call_fastpath                            0,00%  15,99%
          sys_ioctl                                     0,04%  15,99%
            do_vfs_ioctl                                0,00%  15,63%
              radeon_drm_ioctl                          0,11%  15,60%
                drm_ioctl                               0,43%  14,63%
                __pm_runtime_suspend                    0,00%   0,57%
                __pm_runtime_resume                     0,04%   0,14%
                copy_user_enhanced_fast_string          0,07%   0,07%
                irq_exit                                0,00%   0,04%
                _copy_from_user                         0,04%   0,04%
              drm_ioctl                                 0,04%   0,04%
            fget_light                                  0,25%   0,25%
            radeon_drm_ioctl                            0,04%   0,04%
            fput                                        0,04%   0,04%

I have only this GPU so I don't have any comparison to one where runpm works
correctly, whether it should be this active... Maybe it's interesting that
stuff like __pm_runtime_suspend and __pm_runtime_resume is called?

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