Public bug reported:
Binary package hint: hal
On a Gateway MP8708, MP8709 and other non-Gateways, HAL reports
laptop_panel.num_levels=101 but /proc/acpi/video/VGA/LCD/brightness is:
levels: 100 37 12 25 37 50 62 75 87 100
current: 0
gnome-power-manager (and probably other applications) assumes that
num_levels means levels [0,num_levels) are valid. This is not the case
for some backlights.
When an application uses HAL to set the brightness to an illegal value,
/sys/class/backlight/... does not complain but instead sets the
brightness to 0.
Since g-p-m uses 5% increments, the issue manifests as only brightnesses
0%, 25%, 50%, 75% and 100% working, at least for the complaints I've
seen. Users have to press the brightness keys several times to to make
it through all the dark settings to a working one.
See the g-p-m bug https://bugs.launchpad.net/ubuntu/+source/gnome-power-
manager/+bug/121833 for more information.
** Affects: hal (Ubuntu)
Importance: Undecided
Status: New
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Brightness only works at certain levels with g-p-m due to invalid levels
https://bugs.launchpad.net/bugs/162725
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