[ltp] Older radeon under ubuntu 10.04

Alex Deucher linux-thinkpad@linux-thinkpad.org
Mon, 24 May 2010 11:07:33 -0400

On Mon, May 24, 2010 at 9:29 AM, Laurent <pumpkin@gmx.de> wrote:
> Hi,
> i installed ubuntu 10.04 on a R51 (M7 / Radeon 7500) and have problems
> with the suspend-to-ram. ClockGating and DynamicPM are enabled in xorg,
> KMS is disabled via kernel parameter radeon.modeset=0. Kernel
> 2.6.32-22, Xorg 2:1.7.6-2ubuntu7.
> In Suspend-to-RAM the backlight is off, but the display is on => 9cell
> battery goes flat in one day.
> Loading the module radeonfb to get D2 sleep outputs the usual dmesg
> (radeonfb: IBM Thinkpad R51/T40/T41/T42 detected, enabling workaround).
> Display and backlight are now off in suspend.
> But the 2 systems are both trying to enable powersave on the chip:
> "radeonfb: Dynamic Clock Power Management enabled" and
> rovclock -i reports very high core (520MHz) and mem (365MHz)
> frequencies....

Don't use rovclock.  It doesn't take into account the post dividers so
the clocks it reports and sets are wrong depending on the pll dividers
your system is currently using.

> And the system emits a high pitched noise during suspend. Not very
> loud, but enough to make me wonder:
> What is the best way to save power in Xorg and have a useful
> suspend-to-ram?

Is kms not working for you?  We recently added improved power
management support in the 2.6.35 drm pull which is configurable via
However, suspend to ram should work in older kernels with kms as well.


> Will the combination with radeonfb fry the chip? I did not dare to
> test the suspend-to-RAM power consumption. The noise does not sound
> healthy.
> Thanks,
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