[Intel-gfx] Framebuffer compression on GM45 disabled with KMS

[Pedro Ribeiro]

On 1 May 2010 00:06, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Fri, 30 Apr 2010 13:04:23 +0100
> Pedro Ribeiro <pedrib at gmail.com> wrote:
>
>> Hi all,
>>
>> My Xorg.log shows
>>
>> (**) intel(0): Kernel mode setting active, disabling FBC.
>> (**) intel(0): Framebuffer compression disabled
>>
>> Is this normal? I'm trying to lower power consumption for my laptop...
>> Enabling FBC should do it?
>>
>> I have
>> fbpercrtc=0
>> modeset=1
>> powersave=1
>> lvds_downclock=1
>> enabled on the i915 module.
>
> It's just a stale message, I'll remove it.  FBC will be enabled by your
> kernel if possible (you can check /sys/kernel/debug/dri/0/ for status
> info if you have debugfs mounted).
>
> Jesse
>

Thanks for the heads up, actually measuring the power consumption
between KMS and UMS with FBC enabled it seems that KMS wins by a very
slim margin.

Its a great job you guys are doing with this driver!
I see it improve steadily on every kernel release. The only things I
still miss is the render reclock support which was removed in 2.6.32.4
- it worked wonderfully in my machine, reducing power consumption by
2w when idle; and multiple ring buffer support(for libva H.264) which
seems to be coming in the Q3 this year :-)

Regards,
Pedro