Mailinglist Archive: radeonhd (699 mails)

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Re: [radeonhd] Re: [RFC][PATCH] Turning on power save
  • From: Martin Aumueller <aumuell@xxxxxxxxx>
  • Date: Wed, 7 Nov 2007 12:57:48 +0100
  • Message-id: <200711071257.48968.aumuell@xxxxxxxxx>
Some time after fglrx 8.27.0 power consumption of fglrx increased. A patched
radeontool is able to reduce it back to the old value by turning off unused
clocks. Find the radeontool here:
In my experience, after running 'radeontool power low', power consumption of
fglrx is on par with vesa.


On Sunday 04 November 2007, Stefan Monnier wrote:
I've been fiddling with the power save features of the chip, in an
effort to make my laptop a bit less of a space heater. Unfortunately
I've been unable to get any results... :/

I've been using the included patch, which turns on any remaining power
save feature on my board. Either I'm missing something or those
features are doing a lot less than advertised (no measurable effect at

Have you compared the power consumption with vesa and fglrx drivers?
My experience (with a X1300 mobile) is that the fglrx driver consumes
a lot more power than the vesa driver, even if I use aticonfig.
Also the radeonhd driver currently seems to consume the same power as
the vesa driver (contrary to what I first thought).

So I suspect that the power-save feature only affects the card's GPU
used for acceleration, but not the part that just pushes the framebuffer
data out to the video display.

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