[PATCH 0/9] drm/radeon/kms: update pm code

[Alex Deucher]

On Mon, May 10, 2010 at 12:04 PM, Andy Furniss <andyqos at ukfsn.org> wrote:
> Alex Deucher wrote:
>
>> The "profile" method exposes 4 profiles that can be selected from:
>> 1. "default"
>> 2. "auto"
>> 3. "low"
>> 4. "high"
>> Select the profile by echoing the selected profile to
>> /sys/class/drm/card-0/device/power_profile.
>
> Testing on a rv670 desktop it seems that low does not force the card to low
> clock.
>
> Before these patches went in I could force low by
>
> echo 2.0 > /sys/class/drm/card0/device/power_state for 2 screens or
> echo 1.0 > /sys/class/drm/card0/device/power_state for one screen.
>
> Though dmesg didn't always report setting it did work (using bench mark to
> verify) - I could also get dmesg to confirm by echo 2.0 echo 2.2 then echo
> 2.0.
>
> Running current drt with the info -> debug patch reverted I can't get
>
> echo low >  /sys/class/drm/card0/device/power_profile
>
> to lower the clock whatever I try - one screen, two screens forcing high
> then low etc. (nothing in dmesg and benchmark gives full clock results)
>

Send me a copy of your vbios, I may need to adjust the profile table
for rv670.  As root:
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

> dynpm works as before and I do get low clock in dpms with profile.
>
> One separate question - do I need to use the module param dynclks=1 or is it
> the default?
>

The module parameter is obsolete. you can enable it dynamically via
sysfs (power_method).  The default pm method is profile.

Alex