Hi all,
For a different issue related to usb3 I upgraded from 12.04 to 13.04
yesterday and noticed the backlight issue. I don't have a solution but
an OK workaround based on Calvin Li's suggestion.
First, in order to run his command at startup, I added it to
/etc/rc.local. Complete file is at the end of the message.
Then I added a script to /etc/pm/sleep.d/90_intel_backlight_workaround
so that the backlight stays the same after a suspend/resume cycle. See
file below. Make sure the file is executable (mode 755).
I tested it briefly for fresh boot, sleep, resume and it seems to work.
I did not test hibernate/thaw, as I don't use it very much. My laptop is
XPS13 non-HD windows version. bios version is A03 (probably need to
update).
best,
batu
--
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
echo 0 > /sys/class/backlight/intel_backlight/brightness
exit 0
--
#!/bin/sh
#this is: /etc/pm/sleep.d/90_intel_backlight_workaround
# Arguments can be:
# "suspend suspend"
# "resume suspend"
# "thaw hibernate"
case "$1" in
"resume" )
echo 0 > /sys/class/backlight/intel_backlight/brightness
cp /run/intel_backlight_workaround
/sys/class/backlight/acpi_video0/brightness
;;
"suspend" )
cp /sys/class/backlight/acpi_video0/brightness
/run/intel_backlight_workaround
;;
esac
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https://bugs.launchpad.net/bugs/1169376
Title:
XPS13 backlight stopped working after update 3.8.0-18.28
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