* BUG: i830 flickering for horizontal panning
@ 2013-08-31 15:40 Thomas Richter
2013-09-02 6:51 ` Daniel Vetter
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Richter @ 2013-08-31 15:40 UTC (permalink / raw
To: intel-gfx
Dear intel-gfx developers,
panning on i830 based graphics seem to be working only half-ways.
Vertical panning works fine, but horizontal panning flickers at about
60Hz frequency at specific pixel positions. The problem persists
throughout kernel 3.10.9, and potentially later.
How to reproduce: Enable panning, e.g. by
xrandr --fb 2048x1536
xrandr --output DVI1 --panning 2048x1536
then scroll with the mouse slowly to the right.
The affected hardware is *at least* this one:
00:02.0 VGA compatible controller: Intel Corporation 82830M/MG
Integrated Graphics Controller (rev 04)
as it is found in the Fujitsu-Siemens S2475 lifebook. The IBM Thinkpad
R31 is also affected, it also contains a 830GM chipset graphics, but a
different DVO.
There is no specific output when flickering. The screen contents seems
to be flickering between a dark frame and a frame that is half the way
shifted correctly (left) and half the way a copy of the leftmost pixels
of the screen on the right hand side.
The kernel uses the i915 driver for this hardware.
I currently don't see where precisely panning in the i915 sources is
handled, thus I cannot really say what is necessary to support this
correctly.
Greetings,
Thomas
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: BUG: i830 flickering for horizontal panning
2013-08-31 15:40 BUG: i830 flickering for horizontal panning Thomas Richter
@ 2013-09-02 6:51 ` Daniel Vetter
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Vetter @ 2013-09-02 6:51 UTC (permalink / raw
To: Thomas Richter; +Cc: intel-gfx
On Sat, Aug 31, 2013 at 05:40:09PM +0200, Thomas Richter wrote:
> Dear intel-gfx developers,
>
> panning on i830 based graphics seem to be working only half-ways.
> Vertical panning works fine, but horizontal panning flickers at
> about 60Hz frequency at specific pixel positions. The problem
> persists throughout kernel 3.10.9, and potentially later.
>
> How to reproduce: Enable panning, e.g. by
>
> xrandr --fb 2048x1536
> xrandr --output DVI1 --panning 2048x1536
>
> then scroll with the mouse slowly to the right.
>
> The affected hardware is *at least* this one:
>
> 00:02.0 VGA compatible controller: Intel Corporation 82830M/MG
> Integrated Graphics Controller (rev 04)
>
> as it is found in the Fujitsu-Siemens S2475 lifebook. The IBM
> Thinkpad R31 is also affected, it also contains a 830GM chipset
> graphics, but a different DVO.
>
> There is no specific output when flickering. The screen contents
> seems to be flickering between a dark frame and a frame that is half
> the way shifted correctly (left) and half the way a copy of the
> leftmost pixels of the screen on the right hand side.
>
> The kernel uses the i915 driver for this hardware.
>
> I currently don't see where precisely panning in the i915 sources is
> handled, thus I cannot really say what is necessary to support this
> correctly.
Is this a regression?
For your other bug reports we know that the modesetting support for i830M
chipsets is a bit in a sorry state of affairs, search for 830 at
bugs.freedesktop.org. Unfortunately time to really dig into this issues is
hard to come by :(
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
^ permalink raw reply [flat|nested] 2+ messages in thread
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