[Bug 66386] New: Cruft is sometimes displayed on second monitor when their positions are not adjacent

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66386

          Priority: medium
            Bug ID: 66386
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Cruft is sometimes displayed on second monitor when
                    their positions are not adjacent
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mgorny at gentoo.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/Radeon
           Product: xorg

Created attachment 81723
  --> https://bugs.freedesktop.org/attachment.cgi?id=81723&action=edit
Photo showing the issue

I'm using live xorg with Radeon HD5450. I have two monitors connected and I
wanted to set up the second monitor right of the first one with some invisible
space added (to avoid window shadows leaking to the second screen).

I've noticed that with some --pos values (especially odd ones), a line of cruft
is drawn on the left hand side of the screen. I've attached a photo showing
that line.

For example, I see a similar line when using:

  $ xrandr --output VGA-0 --pos 1350x0

(with the other screen running at 1280x1024)

However, the exact shape and colors of the line differ with every xrandr call.
I suspect it has something with modulo 8, maybe memory clearing issue or
something like that.

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