OK, I've modified my Xorg config a little:
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
# VideoRam 16384
# Option "ForceEnablePipeA"
Option "ModeDebug" "yes"
Option "FramebufferCompression" "off"
EndSection
[...]
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
SubSection "Display"
Depth 16
Virtual 2048 2048
EndSubSection
SubSection "Display"
Depth 24
Virtual 2048 2048
EndSubSection
EndSection
This seems to have resolved the pipe underruns, but I'm not 100%
convinced yet. It's been about 10 minutes since I last restarted X, I
played with the screensavers a little at the start, and VGA is still up
and running.
--
VGA-out dies after a while on Eee 1000H
https://bugs.launchpad.net/bugs/257894
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