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

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Date:	Thu, 17 May 2012 10:30:52 +1000
From:	Ben Skeggs <bskeggs@...hat.com>
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Seth Forshee <seth.forshee@...onical.com>
Subject: Re: 3.4-rc7 backlight regression on Dell XPS M1710

Am Mittwoch, den 16.05.2012, 12:17 -0600 schrieb Tim Gardner:
> 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.
That commit is correct, it may have uncovered a bug elsewhere though.

Cheers,
Ben.

> 
> 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


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