Brightness only works at certain levels with g-p-m due to invalid levels
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
hal (Ubuntu) |
Fix Released
|
Low
|
Unassigned |
Bug Description
Binary package hint: hal
On a Gateway MP8708, MP8709 and other non-Gateways, HAL reports laptop_
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/
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:/
Is this symptom still reproducible in 8.10?