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 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
