linux-kernel - 3.4-rc7 backlight regression on Dell XPS M1710

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Date:	Wed, 16 May 2012 12:17:00 -0600
From:	Tim Gardner <tim.gardner@...onical.com>
To:	bskeggs@...hat.com
CC:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Seth Forshee <seth.forshee@...onical.com>
Subject: 3.4-rc7 backlight regression on Dell XPS M1710

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@...onical.com

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