Re: 3.4-rc7 backlight regression on Dell XPS M1710

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On Thu, May 17, 2012 at 10:30 AM, Ben Skeggs <bskeggs@xxxxxxxxxx> wrote:
> 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.
It's been pointed out I should probably be a bit more verbose about
what I'm after here... Apologies :)

The commit that causes the original regression is
a0b25635515ef5049f93b032a1e37f18b16e0f6f.  Did your backlight work
correctly before this?

Thanks,
Ben.

>
> 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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