commit b99da31ed8521eb78d5d6930f3128f8ecdb75fae causes the backlight in
my Dell XPS M1710 to stop working. Symptoms are dim display and won't
respond to key brightness events. I bisected and confirmed that
reverting this single patch on top of 3.4-rc7 fixes the problem.

01:00.0 VGA compatible controller [0300]: nVidia Corporation G71
[GeForce Go 7900 GS] [10de:0298] (rev a1)
	Subsystem: Dell Device [1028:019b]
	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 ed000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Region 3: Memory at ee000000 (64-bit, non-prefetchable) [size=16M]
	Region 5: I/O ports at ef00 [size=128]
	Expansion ROM at efe00000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: nouveau
	Kernel modules: nouveau, nvidiafb

rtg
-- 
Tim Gardner tim.gardner@canonical.com