** Summary changed: - gnome-display-properties locks up X when changing multi-head layout + gnome-display-properties blanks X when changing multi-head layout
** 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. + Repeating this exact process a few times, both screens blank. I can + restore them by vt switching and/or re-running xrandr. 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 blanks X when changing multi-head layout https://bugs.launchpad.net/bugs/351900 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
