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
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