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[John Rigby <732912@xxxxxxxxxxxxxxxxxx>]

After conversation via email (thanks andy green) that this might have
something to do with power management.  Turns out that ondemand scaling
is turned on about 60 seconds after boot.  From etc/init.d/ondemand:


#! /bin/sh
### BEGIN INIT INFO
# Provides:          ondemand
# Required-Start:    $remote_fs $all
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:
# Short-Description: Set the CPU Frequency Scaling governor to "ondemand"
### END INIT INFO


PATH=/sbin:/usr/sbin:/bin:/usr/bin

. /lib/init/vars.sh
. /lib/lsb/init-functions

case "$1" in
    start)
        start-stop-daemon --start --background --exec /etc/init.d/ondemand -- background
        ;;
    background)
        sleep 60 # probably enough time for desktop login

        for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
        do
                [ -f $CPUFREQ ] || continue
                echo -n ondemand > $CPUFREQ
        done
        ;;
    restart|reload|force-reload)
        echo "Error: argument '$1' not supported" >&2
        exit 3
        ;;
    stop)
        ;;
    *)
        echo "Usage: $0 start|stop" >&2
        exit 3
        ;;
esac

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https://bugs.launchpad.net/bugs/732912

Title:
  omapdss DISPC error: GFX_FIFO_UNDERFLOW

Status in “linux-linaro-omap” package in Ubuntu:
  Confirmed

Bug description:
  observed using hwpack for omap3 dated 03102011, using the linaro-
  developer image dated 03102011

  The following message is found via dmesg shortly after boot

  [   76.143890] omapdss DISPC error: GFX_FIFO_UNDERFLOW, disabling GFX

  No other messages are seen related to this message. The system had
  completed booting, network was up and bash was just sitting at the
  prompt

  Further it seems out of the blue. The system had coml