[Nouveau] NOUVEAU_LEGACY_CTX_SUPPORT Fan Speed

[Mar Mel]

 Thanks for finding this Emil! The change you point out also landed on 4.19.49 and I am able to reproduce the fan speed issue with that kernel as well, whereas previous 4.19.x series kernels were fine.
I'll attempt to build both the latest 4.19.x and 5.1.x stable kernels with that patch reverted and see if it's the sole culprit.
    On Friday, June 21, 2019, 1:32:19 PM EDT, Emil Velikov <emil.l.velikov at gmail.com> wrote:  
 
 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+
Thanks.



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60704 – [nouveau, git regression] - I2C PWM fan control broken on nv50 a...


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