As a workaround I use the following script as /etc/pm/sleep.d/01LCD to
fix this for resume from sleep/hibernate. This is on a Thinkpad T500. A
similar thing should be possible somewhere in the boot scripts as well.
#!/bin/sh
# Workaround for LCD brightness bug
# Save this as /etc/pm/sleep.d/01LCD
#. "${PM_FUNCTIONS}"
. "/usr/lib/pm-utils/functions"
case "$1" in
hibernate|suspend)
;;
thaw|resume)
# for some reason the backlight brightness is reset and not set
correctly any more, try
# to get and set the current brightness to re-set the correct
one here
BACKLIGHT=`cat /proc/acpi/video/VID/LCD0/brightness | grep
current | awk '{print $2}'`
logger -t resume -p user.notice "Applying quirk to set full
backlight brightness back to $BACKLIGHT"
echo $BACKLIGHT > /proc/acpi/video/VID/LCD0/brightness
;;
*)
;;
esac
--
[Regression] Screen brightness not 100% at boot or resume from monitor sleep
https://bugs.launchpad.net/bugs/322610
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