Bug#597993: xserver-xorg-video-intel: [865GM] shadowfb makes moving windows way too slow

[Dmitry Semyonov <linulin@gmail.com>]

Hello Julien,

On Thu, Oct 21, 2010 at 13:01, Julien Cristau wrote:
> On Thu, Oct 21, 2010 at 00:30:07 +0400, Dmitry Semyonov wrote:
>
>> Condensed noteworthy differences between old and new Xorg.0.log:
>>
>> < (==) intel(0): Shadow buffer enabled, GPU acceleration disabled.
>> < (II) intel(0): direct rendering: Disabled
>>
>> > (II) intel(0): [DRI2] Setup complete
>> > (II) intel(0): direct rendering: DRI2 Enabled
>>
> Sounds like it's just "fixed" because the 2.13 version doesn't default
> to shadow.  Try 'Option "shadow" "off"' in the Device section of
> xorg.conf with the 2.12+shadow driver, that should be equivalent.

That's right - it fixes the regression as well. (Note however that
'man intel' suggests "shadow" option is disabled by default.)

This reminds me of Lenny release where I had to use
  Option          "AccelMethod" "XAA"
to work-around performance issues on the same (865G) chipset :-/

-- 
...Bye..Dmitry.