[Bug 25603] New: Better support for HUGE desktops

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25603

           Summary: Better support for HUGE desktops
           Product: xorg
           Version: 7.4
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: ancoron at chaoslayer.de
         QAContact: xorg-team at lists.x.org


As I anounced some days ago in the mailing list I would try to use two Dell
3007WFP-HC (each at 2560x1600 at 60Hz) for my little home workstation.

But the result is very disappointing:

- no compositing at all (was very smooth with one of them)
- window manager operations very, very slow
- glxgears less than half of the performance as with only one monitor
- corruption appears when running OpenGL apps

Additionally with even only one monitor I have to set the virtual line because
otherwise I wouldn't get the native resolution and only 1280x800 instead.

But to say some good things, here they are:

- video-playback is still "tear-free"
- scrolling in most applications is still smooth (except gecko-based)

I know that OpenGL texture limits on that card is 4096x4096 texel and my
5120x1600 setup exceeds that for sure but I also had another setup with a
screen size of 4160x1600 (2560x1600 + 1600x1200) and that one was very smooth
at least without composite and it also exceeded the texture size limit.

Although the card in the other setup was a HD2400PRO instead of a X1950XTX I
thought that R5xx chips are even better supported than R6xx is and as it is the
very high-end of those chip series I assume it has enough power to do that.

Keep in mind that the new R8xx chips support even 3 of those monitors driven at
a time. So there should be adequate support for that too.


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