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Bug#607510: Suggestion about slow radeon, debian bug 607510



On Fri, Feb 11, 2011 at 5:06 PM, Gábor Melis <mega@retes.hu> wrote:
> GSR <gsr.bugs@infernal-iceberg.com> writes:
>
>> Hi,
>> daenzer@debian.org (2011-02-11 at 1035.03 +0100):
>>> On Fre, 2011-02-11 at 05:54 +0100, GSR wrote:
>>> > Could you check MigrationHeuristic setting? And try with "greedy"?
>>> This option doesn't have any effect with current upstream xserver and
>>> KMS, and even with older xservers where it accidentally had an effect,
>>> it's probably better to use the radeon driver option "EXAPixmaps" "off"
>>> if you want to prevent acceleration on all pixmaps other than the
>>> visible screen.
>>>
>>> Might be worth trying the current X server and driver in sid first
>>> though to see if they're doing better.
>>
>> With KMS & 6.13.1-2+squeeze1 (Sid has 6.13.2-2, update scheduled in
>> some days) removing MigrationHeuristic from xorg.conf gives acceptable
>> speed, same than with it. So at some point in the past, the issue that
>> required greedy was solved. The obvious test was >5 sec canvas
>> refreshes in GIMP when repositioning the content. Thanks for the tip.
>>
>> GSR
>>
>
> I have tested smart, greedy, exapixmaps on/off with EXA and 'options
> radeon modeset=0'. They don't seem to have any noticable effect with the
> exception of smart that made xorg segfault. Apart from that, the old
> konsole font still makes konsole crawl and there are noise-like
> artifacts on the icons in the taskbar and on window borders.
>
> Another data point is what my other, almost identical t60, does. With
> kms it starts to flicker randomly as if vert sync were off. Sometimes it
> rights itself for no apparent reason. It's unusable. Without kms there
> is no flicker after a day of testing. The konsole font issue is still
> there though.
>
> Note that the two machines have almost identical hardware: the first has
> a slightly faster cpu and 3945ABG wireless, the second has a slower cpu
> and AR5212 wireless. Furthermore, both have the same packages installed
> (by now they both run squeeze) and the same xorg.conf. The module list
> has very few differences and those are due to the different wireless
> cards. BIOS settings are identical, too. BIOS versions are not quite the
> same (2.20 and 2.26), but both are pretty recent (the second behaved the
> same with 2.17 that's older than 2.20). Xorg logs are pretty much the
> same.
>
> For the flickering, Option "DisplayPriority" "HIGH" didn't help either.

There were some pll regressions in 2.6.37.  Try 2.6.38-rc4 or newer.
For reference:
https://bugzilla.kernel.org/show_bug.cgi?id=26552

>
> Gabor
>
>
>
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