[Nouveau] NVAC "No Signal"

[Ben Skeggs]

On 12/24/2016 07:48 PM, Roy Spliet wrote:
> I've observed this regression on my NVAC board; a 1920x1080 TV on HDMI
> (single monitor set-up) gets no signal with Fedora kernels from 4.8.
> Trace sent to the mmio dumps mailbox. A brief scan already revealed that
> register 0xe840 is never touched, so it appears that NVIDIA does
> something different.
> VBIOS for this board is in the usual place. Commenting out 0xac from the
> workaround seems to solve the problem, as tested on a Fedora 4.9 kernel.
> I hope that helps you get a little further with this issue. Cheers, and
> happy holidays!
Thanks Roy,

NVIDIA told me that it applied to these boards, but, I can't see NVIDIA
attempting the workaround in your trace, so until there's evidence to
the contrary, I've disabled it for MCP7x for now.

Ben.

> 
> Roy.
> 
> Op 22-11-16 om 15:04 schreef poma:
>> On 20.10.2016 00:46, Ben Skeggs wrote:
>> [...]
>>> I'd like to see a mmiotrace of the NVIDIA binary driver on a system
>>> where this WAR breaks things.  I applied it to all the GPUs that NVIDIA
>>> told me required it.
>>>
>>> Ben.
>>>
>> Still broken, more than four months,
>> tested with mainline 4.9-rc6.
>>
>> According to Ben Skeggs,
>> since this is "told" by NVIDIA i.e. by you, or perhaps some other of your colleagues,
>> what's more that I don't see progress in this regard,
>> would you guys from NVIDIA R&D mind help him to finally solve this?
>>
>> Thanks.
>>
>>
>> Ref.
>> https://lists.freedesktop.org/archives/nouveau/2016-October/026242.html
>> http://goo.gl/Gm4ffO
>> mmiotrace-nouveau/
>> _______________________________________________
>> Nouveau mailing list
>> Nouveau at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/nouveau
> 

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