Ubuntu
xserver-xorg-video-intel package

  1. Bug #754799
  2. Comment #6

Comment 6 for bug 754799

Revision history for this message
Bryce Harrington (bryce) wrote : Re: [arrandale] external VGA output doesn't output anything

Ok, thanks for testing that. Sounds like we can rule out a simple hotkey issue. So it must be a modesetting issue of some sort, either within the kernel's modesetting code itself, or in the driver wrapping the functionality that XRANDR uses. Given that it works when booted with the monitor attached, the latter may be more likely. In either case, we need more detailed logs to do further analysis.

1. Please install 'xdiagnose' and check the checkbox for turning on debugging messages. Reboot your system so this takes effect.

2. Boot first with the monitor disconnected. Once it's up, attach the monitor and run these commands:

xrandr --auto --verbose > xrandr_bad.txt
dmesg > dmesg_bad.txt

3. Reboot leaving the monitor attached. Verify it comes up good. Now run these commands again:

xrandr --auto --verbose > xrandr_good.txt
dmesg > dmesg_good.txt

Attach all four files here (separately, not in a zip file or anything), and we'll see if we can spot the difference.