ForceLowPowerMode

[hmmm]

???

Spotted it in the original poster's X.Org config file and it struck me as strange too.

It won't do anything as pageflipping isn't properly implemented for anything newer than r2xx chips.

Just realised i misread the man page; it claims that page flipping is implemented on r4xx and older hardware.

[sda1986]

I just add

sda@f3jp:~$ cat /var/log/Xorg.0.log | grep Gating
(**) RADEON(0): Option "ClockGating" "true"
(II) RADEON(0): Dynamic Clock Gating Enabled

But not much result...

[bridgman]

Yeah, that's just picking up one of the three power saving options, so it won't reduce power consumption all that much.

[agd5f]

ClockGating doesn't do anything on r6xx+ chips. You'll need to use the ForceLowPowerMode or DynamicPM options.

[runeks]

I have enabled ForceLowPowerMode in xorg.conf, but it doesn't seem to work. I could have sworn it worked on the previous boot. But now it won't turn on:

rune@runescomp:~$ cat /var/log/Xorg.0.log | grep ForceLowPowerMode
[     6.490] (WW) RADEON(0): Option "ForceLowPowerMode" is not used

Using xorg-edgers/radeon PPA with a 2.6.38 kernel:

Linux runescomp 2.6.38-996-generic #201103251543 SMP Fri Mar 25 15:47:37 UTC 2011 x86_64 GNU/Linux

[runeks]

xorg.conf (forgot to add it to the previous post)

[sda1986]

I've solved since kernel 2.6.35

As root:

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

I insert this row in rc.local in /etc

[bridgman]

ForceLowPowerMode was the right option back in the UMS days when power management was handled in the X driver. These days, however, power management is handled in the kernel driver and controlled via sysfs.

See the RadeonFeature page for more info (scroll down about half way) :

http://www.x.org/wiki/RadeonFeature

[runeks]

Ok, good to know. I just remember xorg-edgers introducing some xorg.conf-option to enable low power mode, but it seems this has disappeared.
I will be using this method instead. Thanks!