Bug#642510: mouse cursor starts jumping ±5px when panning is enabled

["Andrew O. Shadura" <bugzilla@tut.by>]

Package: x11-xserver-utils
Version: 7.5+2
Severity: normal

(Well, it's not really xrandr bug, but of some underlying subsystem, but
I don't know what package to report this bug against.)

My system sometimes has two displays: a built-it LCD of 1440x900px
connected via LVDS, and an external VGA of 1024x768px which is switched
into panning mode:

xrandr --output VGA1 --mode 1024x768 --panning 1440x900

This setting makes my mouse cursor jump for approximately 5px back and
forth about 5 times a second every time it reaches the border of the
current window displayed on the secondary (smaller) screen.

As I understand this thing, first the mouse cursor moves out of the
window, and something returns it back, then moves the window (does the
panning), and then returns the cursor back to the position it was
before, and that happens again and again.

I've spent about half an hour trying different mouses, enabling and
disabling both my trackpoint and touchpad before I noticed this happens
in the very same areas of the screen every time. And only then I guessed
what it can be and checked what my secondary screen displays.

Please, reassign this bug to the appropriate package and forward it to
the upstream, as it's very annoying.

Thanks,

Andrew

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.38-1-686 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages x11-xserver-utils depends on:
ii  cpp                           4:4.6.0-6  GNU C preprocessor (cpp)
ii  libc6                         2.13-7     Embedded GNU C Library: Shared lib
ii  libice6                       2:1.0.5-1  X11 Inter-Client Exchange library
ii  libx11-6                      2:1.3.3-3  X11 client-side library
ii  libxau6                       1:1.0.4-2  X11 authorisation library
ii  libxaw7                       2:1.0.9-2  X11 Athena Widget library
ii  libxext6                      2:1.2.0-2  X11 miscellaneous extension librar
ii  libxi6                        2:1.3-4    X11 Input extension library
ii  libxmu6                       2:1.1.0-1  X11 miscellaneous utility library
ii  libxmuu1                      2:1.1.0-1  X11 miscellaneous micro-utility li
ii  libxrandr2                    2:1.3.0-2  X11 RandR extension library
ii  libxrender1                   1:0.9.4-2  X Rendering Extension client libra
ii  libxt6                        1:1.0.6-1  X11 toolkit intrinsics library
ii  libxxf86vm1                   1:1.1.1-1  X11 XFree86 video mode extension l

x11-xserver-utils recommends no packages.

Versions of packages x11-xserver-utils suggests:
pn  cairo-5c                  <none>         (no description available)
pn  nickle                    <none>         (no description available)
ii  xorg-docs-core            1:1.5.99.901-1 Core documentation for the X.org X

-- no debconf information