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[marmuta <marmvta@xxxxxxxxx>]

Testing HD4670/RV730XT on current Karmic with xserver-xorg-video-radeon 1:6.12.99+git20090629.f39cafc5-0ubuntu6).
I had a hard time starting X, probably because of Bug #419126. It would freeze until I created an xorg.conf with Option DRI 0 and bypassed gdm with startx.

This what I found with an external power meter for the idle system:
93W with empty device section in xorg.conf, 750/873
86W with manually added ClockGating and ForceLowPowerMode, 375/435

and for comparison:
74W with Jaunty fglrx, 165/250 (engine/memory [MHz])
65W without the card, running with intel onboard graphics

Can't say anything about fan speed as this is a passively cooled card.

Seems the first round of improvements has arrived and once manually enabled they do have an effect.
Unfortunately the best I could do without touching source was 12W more than with fglrx on Jaunty.
ForceLowPowerMode still only halfes both engine and mem clock.

-- 
[RV620 HD 3400] No power management with ati driver
https://bugs.launchpad.net/bugs/373669
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which is the registrant for xserver-xorg-driver-ati.