[ltp] Re: X31 - DRI prevents CPU from going to C3 powersaving state

[Michael]

I agree, I have the same effect.

Guess, it`s best you file a bug report at bugs.freedesktop.org . There are
the guys who wrote the radeon dri driver (Michel Dänzer). They should know
best and may be able to change this.

Michael

Michael Kamper wrote:

> Hi,
> 
> I'm quite happy with my X31 and I even made DRI (3D-acceleration) work.
> Now there is just one annoying thing: When I enable DRI in xorg.conf with
>        Load            "dri"
> xorg will constantly cause bus master activity thus preventing the cpu
> enter the C3 powersaving state.
> 
> C3 in
> /proc/acpi/processor/CPU/power
> will never be entered!
> 
> When I disable dri in xorg, C3 is entered as usualy, giving me much more
> battery life and cooler CPU. But this is not really an option, as I love
> to use suspend2 and suspend to ram. So I wouldn't like to restart my
> xserver every time I need 3D-acceleration.
> 
> Anybody has an idea how to solve this problem? I just don't see a reason
>  for my idle X to cause bus master activity.
> 
> Yet some information: I'm using gentoo (stable) with xorg 6.8.2-r7
> Kernel is 2.6.15
> 
> Regards
> Michael