Public bug reported:
Opensource radeon driver's power management is EXTREMELY bad, at least
in default OS setup.
Configuation:
Virtually any (K,X)Ubuntu (32, 64) so far. Latest tested is Xubuntu 11.10
alpha but problem also exists in 11.04, etc.
Problem
I own 2 x AMD HD 5770 PCI-E graphic cards. When I use Radeon opensource
driver, power management is REALLY, REALLY bad. Both GPUs are always running at
maximum - 850MHz core and 1200MHz RAM. Never reducing frequency, ever. Even if
load is minimal or one of cards is unused at all (secondary display detached
and no other loads on secondary GPU). This leads to unreasonable power
dissipation for nothing, CO2 emissions, etc. Cards have leds to indicate load,
each supply phase with it's own led. I can see GPU supply runs all 3 phases all
the time on both cards. In fact, it's quite unpleasant to get ~100W of heat
for nothing when it is already +30C around. Not to mention GPU coolers are
making some noise and power consumption is bad.
Expected:
fglrx is much better at power management. Under exactly same scenario it
instantly downclocks both cards to 157MHz core and ~340MHz RAM, drastically
reducing power consumption (I can even see how 3rd phase of card's supply is
shut off on it's LED after fglrx loads and hear that cooler slows down). I
believe opensource Radeon should do the same, in default setups. After all, it
can get frequencies from the card so it's probably not that hard to set thses
frequencies as well. Actually it looks like if Radeon actually capable of
managing power but this does not works for some reason yet.
ProblemType: Bug
[deleted] - erroneously pasted this from wrong (fglrx) package.
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/825989
Title:
radeon driver power management is very bad: GPU always runs at maximum
clock speed
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