Nouveau - Jun 2014 - [Bug 80507] New: Cannot set pwm1 above 80 on GeForce 9600 GT, 10de:0622

https://bugs.freedesktop.org/show_bug.cgi?id=80507

          Priority: medium
            Bug ID: 80507
          Assignee: nouveau at lists.freedesktop.org
           Summary: Cannot set pwm1 above 80 on GeForce 9600 GT, 10de:0622
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: awilliam at redhat.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

It seems like the /sys/class/drm/card0/device/hwmon/hwmon0/pwm1 value for my
GeForce 9600 GT (10de:0622) will never go above 80.

If I do echo 1 > pwm1_enable (to set it to manual control), then try echoing
values to pwm1, it basically acts as if any value above 80 is identical to 80.

[root at adam hwmon0]# pwd
/sys/class/drm/card0/device/hwmon/hwmon0
[root at adam hwmon0]# echo 79 > pwm1
[root at adam hwmon0]# cat pwm1
79
[root at adam hwmon0]# echo 81 > pwm1
[root at adam hwmon0]# cat pwm1
80
[root at adam hwmon0]# echo 100 > pwm1
[root at adam hwmon0]# cat pwm1
80
[root at adam hwmon0]# echo 100000 > pwm1
[root at adam hwmon0]# cat pwm1
80
[root at adam hwmon0]# echo 30 > pwm1
[root at adam hwmon0]# cat pwm1
30
[root at adam hwmon0]# echo 100000 > pwm1
[root at adam hwmon0]# cat pwm1
80

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--- Comment #1 from Adam Williamson <awilliam at redhat.com> ---
Sorry, this is with:

[root at adam hwmon0]# uname -r
3.16.0-0.rc2.git0.1.fc21.x86_64

Fedora Rawhide.

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--- Comment #2 from Adam Williamson <awilliam at redhat.com> ---
nouveau.debug="PHERM=debug" logs the values as they change, but
doesn't give
any other useful information, it doesn't provide any handy smoking gun hints
as
to what's going on.

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--- Comment #3 from Martin Peres <martin.peres at ensi-bourges.fr> ---
(In reply to comment #2)
> nouveau.debug="PHERM=debug" logs the values as they change, but
doesn't give
> any other useful information, it doesn't provide any handy smoking gun
hints
> as to what's going on.
cat pwm1_max

I guess your vbios states the maximum fan speed is 80%, hence why Nouveau
isn't
allowing you to set anything higher.

Please tell us if pwm1_max is set to 80 so as we close this as not a bug :)

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Adam Williamson <awilliam at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #4 from Adam Williamson <awilliam at redhat.com> ---
Ben initially thought it was a bug as he thought he had a vbios from the same
card indicating it should go higher, but apparently he may have been looking at
the wrong one. pwm1_max is 80, yeah. apparently ideally I should send the vbios
to verify, but Fedora's kernel config doesn't seem to provide the
necessary
bits...I only filed this as Ben thought it was a bug, so let's just close it
for now.

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--- Comment #5 from Martin Peres <martin.peres at ensi-bourges.fr> ---
(In reply to comment #4)
> Ben initially thought it was a bug as he thought he had a vbios from the
> same card indicating it should go higher, but apparently he may have been
> looking at the wrong one. pwm1_max is 80, yeah. apparently ideally I should
> send the vbios to verify, but Fedora's kernel config doesn't seem
to provide
> the necessary bits...I only filed this as Ben thought it was a bug, so
let's
> just close it for now.
This is not the first vbios I see with pwm_max set to 80, hence why I thought
straight away about this. 

You can force the pwm1_max to 100 if you really want to make it go to 100%, but
I wouldn't do that.

Anyway, thanks for the quick response!

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