Ubuntu
gnome-control-center package

  1. Bug #828623
  2. Comment #11

Comment 11 for bug 828623

Revision history for this message
Bryce Harrington (bryce) wrote :

I think I'm able to reproduce more or less this same bug.

For me, it occurs only when I use gnome-control-center to switch from VGA-off-and-LVDS-on directly to VGA-on-and-LVDS-off. If I start with both displays on, and disable LVDS, it works fine. If I use xrandr, it works fine. See bug #737891 (set as a dupe of this one now) for details.

For diagnosing, I used 'xrandr --verbose', which indicates some difference in how the crtcs are being mapped.

I also enabled graphics debugging (sudo xdiagnose, first checkbox, apply, reboot), then collected dmesg before and after doing the switch, once with gnome-control-center, and once with xrandr. I will attach both of these files. (The logs fill with pipe A underrun messages which I believe to be irrelevant so have filtered those out for clarity.)