The Linux 2.6.36 Kernel Will Have Some Fun DRM

[kraftman]

It's already in 2.6.35. I'm sure some bugs will be found but AFAIK we are running EXA, Xv and 3D on 2.6.35 today.

You're not wrong though. It will be in 2.6.48 as well

Power management isn't working for me in 2.6.35. Neither in Arch nor in Kubuntu. It worked in 2.6.34. There's also irritating screen flickering in 2.6.35. Are there some 'special' ways to enable power management?

[RealNC]

http://www.botchco.com/agd5f/?p=49

"To enable power management load the radeon module with dynpm=1"

In Grub that means "radeon.dynpm=1"

[kraftman]

http://www.botchco.com/agd5f/?p=49

"To enable power management load the radeon module with dynpm=1"

In Grub that means "radeon.dynpm=1"

Thanks, but this is not working. There's a message - unknown dynpm parameter or something like this when system boots up.

[xir_]

Thanks, but this is not working. There's a message - unknown dynpm parameter or something like this when system boots up.

I think that command has been depreciated.

[bridgman]

Yep, you now echo commands/modes on the fly rather than using startup parameters... don't have the details in front of me.

[kraftman]

Yep, you now echo commands/modes on the fly rather than using startup parameters... don't have the details in front of me.

I've found I have to echo [something] to /sys/class/drm/card0/device/power_profile. The problem is there's no power_profile. It seems it works for other people.

[Loris]

I've found I have to echo [something] to /sys/class/drm/card0/device/power_profile. The problem is there's no power_profile. It seems it works for other people.

You have to be sure you're running a 2.6.35 or newer kernel, and you have to NOT be passing the radeon.dynpm parameter, or else modprobe won't be able to load the radeon module (both automatically OR manually).

Now, look if drm and radeon modules are loaded:

$ lsmod | grep radeon

if not:

# modprobe radeon

Then:

$ dmesg | grep -i drm

Paste the output on the forum, for all to study.

I've been using the new power management for some time now, and always the files:

/sys/class/drm/card0/device/power_method
/sys/class/drm/card0/device/power_profile

have been created, and correctly worked.

Like this:

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


Finally, sorry if I've rehashed basic things; they could be useful to somebody, someday. ;-)

[agd5f]

Regarding PM:

http://lists.freedesktop.org/archives/dri-devel/2010-May/000492.html

There is a mid profile in 2.6.25 as well. Also the module param is gone in favor of sysfs.

[kraftman]

You have to be sure you're running a 2.6.35 or newer kernel, and you have to NOT be passing the radeon.dynpm parameter, or else modprobe won't be able to load the radeon module (both automatically OR manually).

Now, look if drm and radeon modules are loaded:

$ lsmod | grep radeon

Ok, I have only default parameters right now - quiet and splash in grub.cfg. It seems everything is working fine except PM (and except screen which flickers, but this is probably related to PM):

lsmod |grep radeon
radeon 916632 2
ttm 68317 1 radeon
drm_kms_helper 32776 1 radeon
drm 207342 4 radeon,ttm,drm_kms_helper
i2c_algo_bit 6222 1 radeon

I've been using the new power management for some time now, and always the files:

/sys/class/drm/card0/device/power_method
/sys/class/drm/card0/device/power_profile

have been created, and correctly worked.

This is the problem. I don't have such files. 2.6.35 kernel.

[agd5f]

This is the problem. I don't have such files. 2.6.35 kernel.

If your vbios doesn't define any reduced power states, the files are not added.