[Nouveau] NVAC "No Signal"

[Roy Spliet]

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!

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/
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