Public bug reported:
In xserver 1.14.3-3ubuntu2, we've observed that on multimonitor systems,
we are passed garbage when grabbing the pixels that are not on any
monitor.
This does not appear to be a bug in our application - it can be easily
reproduced by taking a screenshot of the whole screen using GIMP on
Ubuntu 13.10 beta.
The issue is not present in 1.13.3 as shipped in Ubuntu 13.04.
What we are doing: get the geometry of the root window (XGetGeometry),
create a pixbuf of the same size (XShmCreateImage/XShmAttach). Then we
try and grab the whole thing using XShmGetImage.
On multimonitor systems, the off-monitor portions are filling in the
pixbuf with garbage (or garbled portions of other sections of the
screen). That is, the monitors themselves are captured fine, but if the
second monitor is smaller than the first, we used to get a black box in
the dead space, where now we're getting garbage.
I'm trying to track down the source of the regression - a random stab in
the dark might be f21cc327a56e3b453cf0dba04457223d61c27ea6?
Alternatively, it may not be a bug in upstream at all - I haven't yet
looked into the huge patchset Ubuntu's currently maintaining. Ubuntu's
"-3ubuntu2 patchset is far larger than the git diff between 1.13.3 and
1.14.3!
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1240623
Title:
XShmGetImage returns junk/garbage in between monitors
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