[Bug 63900] New: Position of second monitor wrong in dual monitor setup if first monitor is 1366x768

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63900

          Priority: medium
            Bug ID: 63900
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Position of second monitor wrong in dual monitor setup
                    if first monitor is 1366x768
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: alexshopping_hi at yahoo.com
          Hardware: All
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/Radeon
           Product: xorg

I'm using a two-monitor setup with an  ATI Mobility Radeon HD 4200 graphics
card on my Compaq Presario CQ61.
The Laptop screen has a hardware resolution of 1366x768, the external monitor a
hardware resolution of 1280x1024.

If I set up the second monitor using

xrandr --output VGA-0 --mode 1280x1024 --pos 1368x0 --rotate normal --output
LVDS --mode 1366x768 --pos 0x0 --rotate normal
(or the gnome gui, the effects are equal)

I expect:
1) the left 1366x768 area to be on the laptop screen, and
2) the right 1280x1024 area to be on the big monitor.

But I observe:
1) happens as expected
2) happens almost. Instead, the 2 rightmost pixels on the laptop monitor are
repeated on the left border of the big monitor and the two rightmost columns of
the right monitor are not visible on any monitor at all.

If I switch the laptop monitor resolution to 1280x720 (or any more "common"
resolution), this effect does not occur and everything works as expected.

Build Date & Platform:
X.Org X Server 1.12.4
Release Date: 2012-08-27
[    52.070] X Protocol Version 11, Revision 0
[    52.070] Build Operating System: Linux 2.6.32-5-686-bigmem i686 Debian
[    52.070] Current Operating System: Linux eva 3.2.0-4-486 #1 Debian 3.2.32-1
i686
[    52.070] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-486
root=UUID=001323c2-d51c-4188-8cf7-153dc486a5c8 ro quiet
[    52.070] Build Date: 05 November 2012  10:28:15AM
[    52.070] xorg-server 2:1.12.4-3 (Julien Cristau <jcristau at debian.org>) 

OS: Linux Mint Debian Update Pack 6

Other: This bug was also reported on a Ubuntu tracker (I copied it and edited
to suit my circumstances), but it has been reported on multiple OS's and it
would appear to be an upstream Xorg bug:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/680614

There is a workaround in the form of "xrandr --output VGA-0 --auto --pos
1368x0" (shift the second display 2 pixels to the right).

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