Problems with two ATI cards, in recent X versions

Michel Dänzer michel at
Mon Aug 27 07:05:53 PDT 2012

On Fre, 2012-08-24 at 13:19 -0500, Theodore Kilgore wrote: 
> On Fri, 24 Aug 2012, Michel Dänzer wrote:
> > On Don, 2012-08-23 at 18:27 -0500, Theodore Kilgore wrote: 
> > > 
> > > As you can see, it is intended that the "panning" dimensions ought to 
> > > remain at 1920x1080 so that by moving the mouse here or there it is 
> > > possible to see any part of the desktop which is outside of the 800x600 
> > > window, or, one might say, to be able to move the 800x600 "magnified" 
> > > window to any part of the 1920x1080 desktop.
> > > 
> > > Several X versions ago, this used to work. But then it quit working. What 
> > > happens instead is that, if the script is run while the mouse cursor is 
> > > near the bottom right of the screen all is OK. One can move to the left 
> > > and or move up, and the 800x600 window follows the mouse. But once one has 
> > > done that, the 800x600 window is frozen in place and cannot be moved back 
> > > downward, or back to the right.
> > > 
> > > Experimentation has caused me to suspect that the problem is in the ATI 
> > > driver code somewhere, or in the radeon driver code.
> > 
> > That's rather unlikely, as the video driver doesn't deal directly with
> > mouse input at all but just sets the display viewport as requested by
> > the X server.
> > 
> > It sounds like this problem could be fixed by this xserver patch:
> >
> The two machines are, respectively, at home and at the office. The one at 
> home is the one on which this needs to be tested. Right now I am at work, 
> sitting in front of the other machine.
> I can certainly try the above-mentioned patch. Where am I supposed to get 
> the code which is to be patched, though? Should I use recent 
> distro-distributed code, or should I use code from a repository somewhere? 
> Please let me know. Also, assuming that this patch works, is this patch 
> something which is "coming soon"?

It's included in the xserver 1.13 release candidates. You can test it
with one of those or xserver Git
(git:// Otherwise you may need
some preceding patches as well.

Earthling Michel Dänzer           |         
Libre software enthusiast         |          Debian, X and DRI developer

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