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

[bugzilla-daemon@bugzilla.kernel.org]

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

Christoph Haag <haagch.christoph@googlemail.com> changed:

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--- Comment #15 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 122811
  --> https://bugzilla.kernel.org/attachment.cgi?id=122811&action=edit
erratic dpm with window manager actions

Okay, so we got 3.13 without crashes with default settings, so far so good,
thanks so much. :)



The dynpm power management is wonky. It doesn't really fit in here, but I
already dumped a lot of stuff in here anyway and this report has been linked to
in relation to me mentioning that the power management isn't working well yet,
so here is another (not so) small point.

Here is a screenshot from the tool radeon-profile. I believe over the whole
period shown there I have not used the radeon GPU to render anything, but it is
configured as offload slave. I also hope that this tool did not cause this
behaviour, but from the fan noise I think it's happening without it too.

So there are some random "short" spikes that die off after a while of doing
nothing in X. However there are these longer spikes (about 5-7 seconds) when
doing some window management actions. An example of that is
minimizing/unminizing a window or simply changing the focus from one window to
another window via the mouse. I have tested this with kwin with compositing and
openbox without compositing and I think it's pretty clear that this actually
causes it. Changing tabs in chromium also seems to cause it.

The very quick spikes happened when I additionally ran glxgears with kwin
(still everything on the Intel GPU). They died down but appeared sometimes
again after doing something with the windows. With openbox on the other hand I
don't see such quick spikes with glxgears.

Another funny effect in openbox is that a single click on the "gears" in
glxgears doesn't have an effect, but a double click produces one of the longer
spikes. If I single click in chromium here in the bugtracker on the bakground
or in the textarea it produces a spike too. But simply typing in the textarea
does not.

I don't really know what to make of those observations, but I would guess that
the radeon gpu doesn't enter the dynoff state while X is running because of
something related to this. A short google search didn't show anything new about
radeonsi + dynoff, especially nobody who claims it's working, so maybe glamor
is worth looking at?

The intel gpu uses SNA and radeon obviously glamor. If the Xorg.0.log or so
would be helpful, just ask.

Maybe someone with a pre radeonsi gpu could test whether they have the same
issue when using glamor over exa?

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