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

[Pedro Ribeiro]

On 3 May 2010 08:18, Tino Keitel <tino.keitel+xorg at tikei.de> wrote:
> On Mon, May 03, 2010 at 00:35:34 +0100, Pedro Ribeiro wrote:
>
> [...]
>
>> Hi Tino,
>>
>> this gains have been mostly with the computer sitting idle and me not
>> touching it. The biggest gain (over 1w) is when I let the monitor go
>> off into powersaving mode. There is a clear difference here. But maybe
>> its just for my chipset...
>
> I only test with the LCD switched on, but set to lowest brightness.
>
> In the previous test, I had wrong kernel options. The i915. prefix was
> missing.  Now I tested again and got down to 7.0W:
>
> Wakeups-from-idle per second :  8.0     interval: 30.0s
> Power usage (ACPI estimate): 7.0W (3.9 hours) (long term: 7.8W,/3.4h)
>
> I also changed the background image to solid color for better FBC. What
> I noticed during my tests is that I only get such low numbers after a
> resume from suspend to RAM.  Power consumption is ~0.5W higher after a
> resume from suspend to disk using TuxOnIce.  IMHO this should not
> happen.  So, overall I get lower values with the current configuration,
> but I don't know what change gives the power saving, and the suspend
> issue makes it hard to compare.  It could also be a combination of some
> of the configuration changes.
>
> Regards,
> Tino
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>

That's strange... I do not notice any difference if I hibernate with
TuxOnIce (which I do all the time).
Sometimes there is a 2w increase after a hibernate/resume cycle, but
that is due to the flash plugin, which behaves badly with hibernate
(its a piece of crap anyway). Killing the flash process in makes the
power consumption go down again.

Regards,
Pedro