[Nouveau] [BUG][NOUVEAU] G70 broken since 5.10-rc1

[Mark Hounschell]

On 11/26/20 8:01 AM, Christian König wrote:
> Am 26.11.20 um 13:57 schrieb Mark Hounschell:
>> On 11/26/20 7:41 AM, Christian König wrote:
>>> Hi Mark,
>>>
>>> Am 26.11.20 um 13:26 schrieb Mark Hounschell:
>>>> On 11/26/20 7:05 AM, Christian König wrote:
>>>>> Hi Mark,
>>>>>
>>>>> Am 26.11.20 um 10:59 schrieb Mark Hounschell:
>>>>>> On 11/26/20 3:35 AM, Christian König wrote:
>>>>>>>> I'm running an older "NVIDIA Corporation G70 [GeForce 7800 GT] (rev 
>>>>>>>> a1)" card in a newer BIOSTAR B550GTA MB. Kernel 5.10-rcx does not 
>>>>>>>> work. I get no virtual consoles or X screen.
>>>>>
>>>>> thanks for the dmesg.
>>>>>
>>>>> Problem is I don't have the slightest idea what's going wrong here :)
>>>>>
>>>>> The code should be functional identical, it was just moved from TTM to 
>>>>> nouveau, so we are missing some detail in the handling.
>>>>>
>>>>> Can you run the following test for me: First you need to disable 
>>>>> loading of the nouveau kernel module by adding 
>>>>> modprobe.blacklist=nouveau to the kernel command line.
>>>>>
>>>>> Then log into the system over the network and run the following commands:
>>>>>
>>>>> sudo modprobe ttm
>>>>> sudo bash -c "echo 'ttm_bo_kmap' > 
>>>>> /sys/kernel/debug/tracing/set_graph_function"
>>>>> sudo bash -c "echo function_graph > 
>>>>> /sys/kernel/debug/tracing/current_tracer"
>>>>> sudo modprobe nouveau
>>>>> sudo bash -c "cat /sys/kernel/debug/tracing/trace" > trace.log
>>>>>
>>>>> Please then send me the resulting trace.log file so that I can 
>>>>> investigate why mapping the framebuffer fails during driver load.
>>>>>
>>>>> Thanks in advance,
>>>>> Christian.
>>>>
>>>> I hope this is what you need. I do normally turn off a lot of debug 
>>>> features. Let me know if I need to change the kernel config.
>>>
>>> It was not what I had expected but it pointed me in the right direction. 
>>> I think I've found the problem, it's just an uninitialized return value 
>>> for your hardware generation.
>>>
>>> Please try the attached patch and let me know if it fixes the problem.
>>>
>>> Thanks in advance,
>>> Christian.
>>
>> Yep, that fixed it.  -rc6?
> 
> If I get an rb today then yes, otherwise it might end up in -rc7 next week.
> 
> Any objection if I add an Reported-and-Tested-by: Mark Hounschell 
> <dmarkh at cfl.rr.com> ?
> 
> Thanks for the help,
> Christian.
> 

Ya, no problem. Just use markh at compro.net though.

Regards
Mark