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SubjectRe: i835GM flicker on panning
Hm, that sounds a bit more like the ddx is having fun with rendering.
Have you tried switching the backed from to either SNA or UXA? Also
adding relevant mailing lists ...

On Sun, Sep 22, 2013 at 7:06 PM, Thomas Richter <> wrote:
> Hi folks, hi Daniel,
> there is still an issue with flicker on panning with the 835GM chipset. As
> already explained, the flicker only appears if the panning position
> satisfies certain alignment constraints, in specific. As long as the plane
> pointer is aligned to 64 byte boundaries, everything works correctly.
> I tried now to add a parameter to the kernel to adjust the watermark level
> of the chipset and see whether this makes any difference with regards to the
> flicker. However, it does not. It seems that the trouble is not there.
> However, I noticed something interesting: If I use a non-native mode of the
> display, i.e. enable the scaling feature of the DVO, everything works, and
> no flicker ever appears. However, in these situations the resolution is also
> lower than that of the native display, and hence the issue may also be
> related to the PLL clock.
> I also noticed that if I invert the display, i.e. use the rotation feature,
> even in the native resolution, nothing flickers, though panning is rather
> slow.
> Does this somehow ring a bell? Can I somehow force the driver to use the
> same logic for the regular display as for the inverted display to avoid the
> flicker?
> Any help would be appreciated.
> Greetings,
> Thomas

Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 -

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