Public bug reported:
Binary package hint: gnome-control-center
Problem: When swapping dual monitors left to right, on apply in gnome-
display-properties one screen (the left one) blanks out; repeating this
swapping a couple times locks up Xorg. Using the 'xrandr' command line
tool to do the same operation works perfectly with no lockup.
Discussion: I have a dual-monitor setup using xrandr on an ATI 5xx card
using the -ati driver. I tested out gnome-display-properties by
launching it and then simply swapping my two monitors left-for-right (no
other changes).
The first time I hit apply, the left monitor turned blank with "No
Signal" shown. The right monitor displayed what was on the left monitor
before, and did so in a manner that suggested gnome-panel was still
assuming two monitors and not one. The cursor also disappeared off the
edge of the remaining screen in a manner suggesting that X thought there
was another monitor. In the past, vt-switching would sometimes bring
the second screen back, but this time it didn't. I let the confirmation
dialog time out, and it returned the system to the original layout.
Repeating this exact process again, this time X locked up.
I attempted to reproduce the issue using only xrandr, via the command
`xrandr --output DVI-0 --left-of DVI-1`, alternating --left-of and
--right-of appropriately. I repeated this a dozen times and it always
worked perfectly.
(In fact, with gnome-display-properties, there is always a couple second
delay after hitting apply, whereas with the xrandr command line tool,
the change is instantaneous. Maybe that's a clue.)
Because I can reproduce this bug only when using gnome-display-
properties, and not with 'xrandr', I am assuming this to be due to a bug
in the gnome capplet, not a bug in Xorg.
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
Binary package hint: gnome-control-center
Problem: When swapping dual monitors left to right, on apply in gnome-
display-properties one screen (the left one) blanks out; repeating this
swapping a couple times locks up Xorg. Using the 'xrandr' command line
tool to do the same operation works perfectly with no lockup.
Discussion: I have a dual-monitor setup using xrandr on an ATI 5xx card
using the -ati driver. I tested out gnome-display-properties by
launching it and then simply swapping my two monitors left-for-right (no
other changes).
The first time I hit apply, the left monitor turned blank with "No
Signal" shown. The right monitor displayed what was on the left monitor
before, and did so in a manner that suggested gnome-panel was still
assuming two monitors and not one. The cursor also disappeared off the
edge of the remaining screen in a manner suggesting that X thought there
was another monitor. In the past, vt-switching would sometimes bring
the second screen back, but this time it didn't. I let the confirmation
dialog time out, and it returned the system to the original layout.
Repeating this exact process again, this time X locked up.
I attempted to reproduce the issue using only xrandr, via the command
`xrandr --output DVI-0 --left-of DVI-1`, alternating --left-of and
--right-of appropriately. I repeated this a dozen times and it always
worked perfectly.
(In fact, with gnome-display-properties, there is always a couple second
delay after hitting apply, whereas with the xrandr command line tool,
the change is instantaneous. Maybe that's a clue.)
+
+ Because I can reproduce this bug only when using gnome-display-
+ properties, and not with 'xrandr', I am assuming this to be due to a bug
+ in the gnome capplet, not a bug in Xorg.
--
gnome-display-properties locks up X when changing multi-head layout
https://bugs.launchpad.net/bugs/351900
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