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[Bug 825989] Re: radeon driver power management is very bad: GPU always runs at maximum clock speed


RISC_CPU, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue? If
so, could you please test for this with the latest development release
of Ubuntu? ISO images are available from http://cdimage.ubuntu.com
/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

If reproducible, could you also please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:

where VERSION-NUMBER is the version number of the kernel you tested. For example:

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:

If the mainline kernel does not fix this bug, please add the following tags:

As well, please remove the tag:

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your

** This bug is no longer a duplicate of bug 748080
   ATI card fan is always on with opensource radeon driver

** Tags added: needs-kernel-logs needs-upstream-testing regression-

** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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  radeon driver power management is very bad: GPU always runs at maximum
  clock speed

Status in X.org XServer - ATI gfx chipset driver:
Status in “linux” package in Ubuntu:

Bug description:
  Opensource radeon driver's power management is EXTREMELY bad, at least
  in default OS setup.

   Virtually any (K,X)Ubuntu (32, 64) so far. Latest tested is Xubuntu 11.10 alpha but problem also exists in 11.04, etc.

   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.

   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.

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