[Nouveau] NVAC "No Signal"

[Ben Skeggs]

On 10/20/2016 03:58 AM, Pierre Moreau wrote:
> Hello,
> 
> On 07:37 pm - Oct 19 2016, poma wrote:
>> On 19.10.2016 17:03, Karol Herbst wrote:
>>
>>> You don't get why I try to say. We have to actually find out when to
>>> apply this workaround, not to create some silly whitelist/blacklist.
>>> It's the last option, we never want to actually use.
>>>
>>
>> Well if you do not say, who can understand!? :)
>> Besides, you can mock with "silly" whitelist/blacklist", however there is nothing wrong with the method as such, it is used practically everywhere.
>>
>>> And even if we would have to create such lists, who tells us, that if
>>> affects every GPU with your device id? Usually quirks are applied
>>> depending on the sub-vendor-id and sub-device-id if actually required.
>>>
>>> In the end we need something like this: If byte X in table Y is set in
>>> the vbios or if bits A-B in reg Z in the MMIO space are set to
>>> whatever, we have to apply that workaround.
>>>
>>> In the end we should also wait until Ben replies, because he might
>>> know the exact reasons why this workaround was actually needed.
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.

>>>
>>
>> If you eager to leave it broken even more than three months that have already been passed since the original commit ...
>>
>>> We might have a GPU with the same chipset like yours and we might be
>>> able to verify the issue
>>>
>>
>> Ah, I see.
>> You do not have confidence in my test results, good to know.
> 
> Testing on another GPU with the same chipset does not mean he does not trust
> your results. For example, my laptop (which also has an NVAC) has been
> triggering the no-signal message on external monitors way before Ben’s patch
> landed, but only for some adapters. I haven’t tried Ben’s patch yet, nor yours,
> but I will certainly do it, and see what effect each of them has.
> 
> Regards,
> Pierre
> 
>>
>> Oh! Carol
>>
>>
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