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[Bug 754799] 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.

** Changed in: xserver-xorg-video-intel (Ubuntu)
   Importance: Undecided => Medium

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/754799

Title:
  [arrandale] external VGA output doesn't output anything



References