rRadeon 9000 + X.Org 1.11.2 + EnablePageFlip + opengl = crash

[Alex Deucher]

On Tue, Dec 6, 2011 at 5:04 PM, Giuliano Pochini <pochini at shiny.it> wrote:
> On Tue, 6 Dec 2011 08:46:41 +0000
> Dave Airlie <airlied at gmail.com> wrote:
>
>> On Mon, Dec 5, 2011 at 8:41 PM, Giuliano Pochini <pochini at shiny.it> wrote:
>> > First, my config:
>> >
>> > 0000:00:10.0 VGA compatible controller: ATI Technologies Inc Radeon RV250 If [Radeon 9000] (rev 01)
>> >
>> > Linux Jay 3.1.0 #3 SMP Tue Nov 1 17:58:39 CET 2011 ppc 7455, altivec supported PowerMac3,6 GNU/Linux
>> >
>> >
>> > When EnablePageFlip is enabled the machine crashes as soon as another
>> > window hides any part of the glxgears window. The screen turns off and a
>> > hard reset is needed (Rsys+B does not work). I'm not using KMS.
>>
>> Thats probably the problem then. Supporting UMS is not on anyones list
>> that cares anymore.
>
> Well, I think EnablePageFlip was just ignored in older versions of
> Xorg or kernel. Now, when EnablePageFlip is enabled, glxgears runs about
> 15% faster, while it made no difference before.

The option has been around for UMS for years, but few people use UMS anymore.

>
> I also tried KMS. When EnablePageFlip is enabled glxgears renders nothing
> and X freezes immediately except the mouse pointer. After a few second the
> screen blanks and a reboot is the only cure.
>
> W/o EnablePageFlip it works better. glxgears looks OK, but it runs at
> 60fps. xterm colours are wrong. Everything else seems fine. Running other
> 3D apps (Nexuiz, Scorched3D) works fine at first, but seconds or minutes
> later it locks up the same way without any symptom before that moment.
>

With KMS apps are synced the refresh rate by default,  you can
override that by setting the env var vblank_mode=0, e.g.,
vblank_mode=0 glxgears

Pageflipping with KMS works fine here, so it may be something mac specific.

>
>> So unless its a regression in the kernel and you can bisect it I'm not
>> sure you'll see much help.
>
> Plus I have pretty old hardware and hard lock ups are hard to debug...
>
>
>
> --
> Giuliano.
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