There is a fix for this issue, but I do not know how to make a patch
(yet) to submit. The fix is found @ http://www.ubuntu1501.com/2008/04
/overview-of-ubuntu-804-hardy-heron-on.html . and was blogged by aaronmt
(http://www.blogger.com/profile/00032734089773880467).
<quote>
To fix brightness, it's easy as just editing two script files. No bios change
whatsoever.
sudo gedit /etc/acpi/video_brightnessup.sh
replace everything in the file with
#!/bin/bash
CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk
'{print $2}')
case "$CURRENT" in
100)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;;
87)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;;
75)
echo -n 87 > /proc/acpi/video/VGA/LCD/brightness;
;;
62)
echo -n 75 > /proc/acpi/video/VGA/LCD/brightness;
;;
50)
echo -n 62 > /proc/acpi/video/VGA/LCD/brightness;
;;
37)
echo -n 50 > /proc/acpi/video/VGA/LCD/brightness;
;;
25)
echo -n 37 > /proc/acpi/video/VGA/LCD/brightness;
;;
12)
echo -n 25 > /proc/acpi/video/VGA/LCD/brightness;
;;
*)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness ;
;;
esac
sudo gedit /etc/acpi/video_brightnessdown.sh
replace everything in the file with
#!/bin/bash
CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk
'{print $2}')
case "$CURRENT" in
12)
echo -n 12 > /proc/acpi/video/VGA/LCD/brightness;
;;
25)
echo -n 12 > /proc/acpi/video/VGA/LCD/brightness;
;;
37)
echo -n 25 > /proc/acpi/video/VGA/LCD/brightness;
;;
50)
echo -n 37 > /proc/acpi/video/VGA/LCD/brightness;
;;
62)
echo -n 50 > /proc/acpi/video/VGA/LCD/brightness;
;;
75)
echo -n 62 > /proc/acpi/video/VGA/LCD/brightness;
;;
87)
echo -n 75 > /proc/acpi/video/VGA/LCD/brightness;
;;
100)
echo -n 87 > /proc/acpi/video/VGA/LCD/brightness;
;;
*)
echo -n 50 > /proc/acpi/video/VGA/LCD/brightness ;
;;
esac
</quote>
There are several positive responses to it with different BIOS releases.
Worked great on my 1501 running the 32bit distro.
Isn't this a bug with HAL though, not gnome power manager?
Dov
--
Can't change display brightness on Dell Inspiron 1501
https://bugs.launchpad.net/bugs/105512
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