Red Hat Bugzilla – Bug 483860
System boots with backlight off
Last modified: 2009-07-14 11:54:23 EDT
Description of problem:
When using Fedora distro kernels, the system boots with the backlight off. Moreover, the xrandr program is unable to change the backlight brightness. That is 'xrandr --output LVDS --set BACKLIGHT 20' has no effect. This *ONLY* happens with the distro kernels. If I build a kernel from kernel.org or anholt's drm-intel-next kernel, the backlight functions correctly.
Version-Release number of selected component (if applicable):
kernel-184.108.40.206-78.2.8.fc9.x86_64 (but happens with other F9 kernels as well)
Every time I accidentally boot with a Fedora distro kernel instead of a kernel.org kernel that I built.
Steps to Reproduce:
1. Install distro kernel
2. Boot system
Backlight off, unable to adjust.
Backlight on, able to adjust.
The system in question is a Panasonic Toughbook CF-Y7. The video chipset is:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
Subsystem: Matsushita Electric Industrial Co., Ltd. Unknown device 8338
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-
Interrupt: pin A routed to IRQ 16
Region 0: Memory at fc000000 (64-bit, non-prefetchable) [size=1M]
Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at 1800 [size=8]
Capabilities: <access denied>
Kernel modules: i915, intelfb
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