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

[Christian König]

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.

>
> Thanks
> Mark
>