[Nouveau] NOUVEAU_LEGACY_CTX_SUPPORT Fan Speed

[Emil Velikov]

Some weird interaction with disabling the i2c access, in the following
patch perhaps?

commit cd68344b283174a9b38e9488d5a929464e1f417c
Author: Lyude Paul <lyude at redhat.com>
Date:   Tue Apr 9 16:23:30 2019 -0400

    drm/nouveau/i2c: Disable i2c bus access after ->fini()

On Sun, 16 Jun 2019 at 15:28, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> I don't really see anything between v5.0..v5.1 which would account for
> this. Could have been a subtle change to the i2c logic somewhere. The
> fastest way to identify the problem would be to do a bisect on the kernel
> to identify the commit that caused this. There are many guides for this
> online.
>
> On Sat, Jun 15, 2019 at 12:17 PM Mar Mel <marmel6942 at yahoo.com> wrote:
>
>> Unfortunately, even with this change now reverted in kernel 5.1.10, the
>> fan speed issue persists.
>>
>> If someone could point me in the direction of a relevant commit(s) I'll
>> happily file a bug report.
>>
>> On Thursday, June 13, 2019, 11:19:25 AM EDT, Mar Mel <
>> marmel6942 at yahoo.com> wrote:
>>
>>
>> As of kernel 5.1.9, on resume from suspend, my NV50 fan runs at full
>> speed.
>>
>> Not sure if it has to do with this new config option (
>> NOUVEAU_LEGACY_CTX_SUPPORT)?
>>
>> This issue is not present using kernel 5.0.21.
>>
>> Years ago I filed a similar issue:
>>
>> 60704 – [nouveau, git regression] - I2C PWM fan control broken on nv50
>> adt7475 on kernels 3.3.x+
>> <https://bugs.freedesktop.org/show_bug.cgi?id=60704>
>>
>> Thanks.
>>
>>
>> 60704 – [nouveau, git regression] - I2C PWM fan control broken on nv50
>> a...
>>
>> <https://bugs.freedesktop.org/show_bug.cgi?id=60704>
>>
>>
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>
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