[Bug 25191] New: Lost right edge in GTK app on right edge of extended desktop

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25191

           Summary: Lost right edge in GTK app on right edge of extended
                    desktop
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: matthew.brett at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=31322)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=31322)
A screenshot of the whole desktop showing the position of the truncation

I am getting odd behavior on the right hand side of my
dual monitor desktop, with acceleration enabled, but not when it is disabled.

I have a Radeon X300 in a Thinkpad T43 laptop, running default
resolution on the LCD (left), VGA (right) of 1400x1050, 1920x1080
respectively.

On one occasion this involved a scrambled screen on the right side of
the external monitor; I cannot reproduce this.

It always involves lost characters on emacs GTK screens (graphic attached).  On
the graphic you can see the left hand emacs window showing the full text, and
the right-hand window mainly blank, being truncated at a set position on the
screen.  The position of truncation appears to be at x pixel 2640.  If I move
the emacs window left or right, the characters are truncated at the same place
on the screen. 

I don't get this problem with the emacs-x11 (v22) build.   The same
GTK build of emacs works without problem on an dual monitory nvidia setup on a
desktop elsewhere.

I have a Radeon X300 in a Thinkpad T43 laptop, running default
resolution on the LCD (left), VGA (right) of 1400x1050, 1920x1080
respectively.

Option "NoAccel" "on" resolves this problem but gives very slow
graphics performance.

Switching the LCD to be right of the VGA results in the problem
switching to the right side of the LCD.

lspci -v ->

01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility
Radeon X300]
       Subsystem: IBM Device 056e

I'm running a Karmic Koala fresh install.  I can't see any errors in
the xorg log.

xorg.conf is:

Section "Screen"
        Identifier      "Configured Screen Device"
        Device  "Configured Video Device"
        SubSection "Display"
                Virtual 3320 1080
        EndSubSection
EndSection

Section "Device"
    Identifier  "Configured Video Device"
    Driver "radeon"
EndSection


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