Bug#664044: the wallpaper is fragmented when using xrandr to switch dual monitor

[朱立  Julian]

Package: gnome-shell
Version: 3.2.2.1-2
Severity: normal

Dear Maintainer,

I used to work by using dual monitor, and using DisplayPort to connect my
external monitor.

when booting complete, I connect external monitor by DisplayPort,
gnome-shell use the external monitor for extra workspace automatically,
that works good.

Once I use xrandr to set to output for screens, the wallpaper might be
fragmented and each items on desktop will disappear.

this is the way I use xrandr, it turn off LCD of laptop, and set the
external monitor to 1920x1080.

    $ xrandr --verbose --output DP1 --primary --mode 1920x1080 --output
LVDS1 --off --output HDMI1 --off --output VGA1 --off

this is the screenshot of result.
https://picasaweb.google.com/111787784022722324434/Screenshots#5719987652768294162

this is the screenshot when I trigger the hot-corner to see the dash, it
looks correctly.
https://picasaweb.google.com/111787784022722324434/Screenshots#5719987790007930434

In the transition from Seeing-Workspace to Seeing-Dash by triggering
hot-corner, I could see the correct wallpaper and disappeared items in very
short time.

Moreover, not only above xrandr command cause the problem, but also the
command to turn off external monitor.

    $ xrandr --verbose --output LVDS1 --primary --mode 1366x768 --output
HDMI1 --off --output VGA1 --off --output DP1 --off


Configuration:

External monitor:     Dell U2311H
Laptop:       Lenovo thinkpad x220
connect to external monitor via DisplayPort

Debian Testing, daily upgrade.
Kernel:     3.2.0-2-amd64
x11-xserver-utils:    7.6+3
xserver-xorg:    1:7.6+12
xserver-xorg-video-intel:     2:2.18.0-1
libdrm-intel1:    2.4.30-1

please remind me if I should provide more information.

Best Regards,

-Ju1ian
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