[Bug 52345] New: KMS Power Management have no effect

[Bug 52345] New: KMS Power Management have no effect

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https://bugs.freedesktop.org/show_bug.cgi?id=52345

             Bug #: 52345
           Summary: KMS Power Management have no effect
    Classification: Unclassified
           Product: DRI
           Version: XOrg CVS
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: d2xdt2@gmail.com


Using 

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD SUMO2
OpenGL version string: 2.1 Mesa 8.0.3
OpenGL shading language version string: 1.20

AMD A4-3400 APU with Radeon(tm) HD Graphics
Fedora 17 64bit
Linux amd 3.4.5-2.fc17.x86_64 #1 SMP Mon Jul 16 20:52:08 UTC 2012 x86_64 x86_64
x86_64 GNU/Linux


According to
http://wiki.x.org/wiki/RadeonFeature

should

echo profile > /sys/class/drm/card0/device/power_method
echo high >  /sys/class/drm/card0/device/power_profile

put the GPU in high performance mode and

echo profile > /sys/class/drm/card0/device/power_method
echo low >  /sys/class/drm/card0/device/power_profile

in low performance mode.

glxgears gives 60 FPS in both cases, which leads me to beleive that power
management does work.

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[Bug 52345] KMS Power Management have no effect

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https://bugs.freedesktop.org/show_bug.cgi?id=52345

--- Comment #1 from Matt Turner <mattst88@gmail.com> 2012-07-21 16:43:06 UTC ---
(In reply to comment #0)
> glxgears gives 60 FPS in both cases, which leads me to beleive that power
> management does work.

Does your glxgears print this?

> Running synchronized to the vertical refresh.  The framerate should be
> approximately the same as the monitor refresh rate.

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[Bug 52345] KMS Power Management have no effect

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--- Comment #2 from Martin <d2xdt2@gmail.com> 2012-07-21 16:54:21 PDT ---
Yes it does.

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[Bug 52345] KMS Power Management have no effect

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--- Comment #3 from Matt Turner <mattst88@gmail.com> 2012-07-21 17:39:50 PDT ---
(In reply to comment #2)
> Yes it does.

So... vsync is making glxgears run at 60 FPS no matter what..

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[Bug 52345] KMS Power Management have no effect

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--- Comment #4 from Amadeus <sha256sum@gmail.com> 2012-07-21 19:13:08 PDT ---
I see.

If I do

glxgears -geometry 1600x1024+0+0

then I get 40 FPS in both cases instead of 60fps. It takes ~3% CPU.

If I start a 3D game in Wine, it feels the same (very slow).

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[Bug 52345] KMS Power Management have no effect

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--- Comment #9 from Amadeus <sha256sum@gmail.com> 2012-07-22 22:06:18 UTC ---
Created attachment 64513
  --> https://bugs.freedesktop.org/attachment.cgi?id=64513
xorg log with drm.debug=6

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[Bug 52345] KMS Power Management have no effect

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--- Comment #11 from Grigori Goronzy <greg@chown.ath.cx> 2012-07-22 22:18:02 UTC ---
Not much, actually, the table looks very similar to AMD PALM / Radeon 6320 on
my netbook. The GPU part of Zacate and Llano is probably very similar, except
for clocks and number of shader cores. And that means you suffer from the same
issues.

IMHO the sanity check that limits the clock should be removed altogether, as it
doesn't make much sense. If you fancy recompiling the kernel, just comment this
out from radeon_pm.c:

189                 if (sclk > rdev->pm.default_sclk)
190                         sclk = rdev->pm.default_sclk;

This should get clock switching going.

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[Bug 52345] KMS Power Management have no effect

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Sven Arvidsson <sa@whiz.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sa@whiz.se

--- Comment #5 from Sven Arvidsson <sa@whiz.se> 2012-07-22 20:26:38 PDT ---
There should be a way to check the engine clock to see if it's running at full
speed:

# cat /sys/kernel/debug/dri/0/radeon_pm_info

You'll need debugfs mounted first.

There was some talk on Phoronix about another APU running with very low clocks,
could be something similar here perhaps?
http://phoronix.com/forums/showthread.php?72046-E-450-graphics-performance-issues

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[Bug 52345] KMS Power Management have no effect

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--- Comment #6 from Amadeus <sha256sum@gmail.com> 2012-07-22 21:13:23 PDT ---
Very interesting thread. It seams to be the same problem I have.

Regardless of the power settings I never get a higher engine clock than ~75kHz.

[root@amd ~]# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 200000 kHz
current engine clock: 73950 kHz
default memory clock: 533000 kHz

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[Bug 52345] KMS Power Management have no effect

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--- Comment #7 from Grigori Goronzy <greg@chown.ath.cx> 2012-07-22 21:46:19 PDT ---
You might have the same problem as me, see
http://lists.freedesktop.org/archives/dri-devel/2012-July/025159.html

First, the engine clock readout seems to be completely bogus on APUs, disregard
it.

Second, the power management functions limit the maximum engine clock to the
default engine clock. On most standalone GPUs, the default clock seems to be
equivalent to the maximum p-state's clock, so that is fine. Not so much on the
APUs!

I'm interested in what the AtomBIOS PowerPlay table looks like on your device.
Can you boot with drm.debug=6 in the kernel command line and tell me what it
says in the log?

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[Bug 52345] KMS Power Management have no effect

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--- Comment #8 from Amadeus <sha256sum@gmail.com> 2012-07-22 22:05:25 PDT ---
Created attachment 64512
  --> https://bugs.freedesktop.org/attachment.cgi?id=64512
dmesg with drm.debug=6

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[Bug 52345] KMS Power Management have no effect

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--- Comment #10 from Amadeus <sha256sum@gmail.com> 2012-07-22 22:08:06 PDT ---
Very interesting!

What can you gather from the attached logs where I have booted with drm.debug=6
?

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https://bugs.freedesktop.org/show_bug.cgi?id=52345

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #12 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/284.

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