Red Hat Bugzilla – Bug 841108
Double brightness control
Last modified: 2013-07-31 20:46:00 EDT
Description of problem:
When change screen backlight brightness with FN+arrows keys osd showing only max and min positions and brightness change, then go back, then set at desired level. At acer extensa 5635ZG, nvidia.
Version-Release number of selected component (if applicable):
Appears since i use Fedora 16 december 2011
Steps to Reproduce:
for example, we have level 8 (max)
1. hold fn+arrow
2. when set desired level release (level 1). Osd show start level and end level only (8,1,5,1).
3. Brightness will set to levels: 8,7,6,5,4,3,2,1,5,4,3,2,1
correct osd and no double control
At this machine, brigthness can be changed before OS boot, so i think fedora brightness control tool (or gnome-power-manager) and hardware control conflict with each other.
In ubuntu 10.04, 10.10, 11,04 works fine with propietary driver and nouveau
01:00.0 VGA compatible controller: nVidia Corporation G98M [GeForce G 105M] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 0253
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at ce000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 3: Memory at cc000000 (64-bit, non-prefetchable) [size=32M]
Region 5: I/O ports at 2000 [size=128]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: nouveau
3.5.3-1.fc17.i686.PAE still happens
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