[Bug 48174] New: Driver triggers a BUG when using "xrandr --left-of"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48174

             Bug #: 48174
           Summary: Driver triggers a BUG when using "xrandr --left-of"
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: tomi.pievilainen+freedesktop at iki.fi
         QAContact: xorg-team at lists.x.org


Created attachment 59361
  --> https://bugs.freedesktop.org/attachment.cgi?id=59361
Xorg log

This happens on newest Ubuntu (precise beta): login manager shows fine (on one
screen, other has signal out of range, but that is normal), but trying to set
the two screens side by side freezes X.

These work:
xrandr --newmode 2560x1600 268.00  2560 2608 2640 2720  1600 1603 1609 1646
+hsync -vsync
xrandr --addmode DisplayPort-0  2560x1600
xrandr --newmode "1280x800"x59.9   71.00  1280 1328 1360 1440  800 803 809 823
+hsync -vsync
xrandr --addmode DisplayPort-0  "1280x800"x59.9
xrandr --output DisplayPort-0 --mode 2560x1600

But this fails:
xrandr --output DisplayPort-0 --left-of DVI-0

$ uname -a
Linux shirio 3.3.0-030300rc3-generic #201202082335 SMP Thu Feb 9 04:36:53 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux

xorg 1:7.6+12ubuntu1, radeon driver 1:6.14.99~git20111219.aacbd629-0ubuntu2

Xorg.log attached

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