[Bug 26302] [M7 LW] desktop runs out of video memory on ATI Radeon Mobility 7500

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26302





--- Comment #7 from Jamie Strandboge <jamie at strandboge.com>  2010-02-09 07:14:54 PST ---
I have tried various things to help diagnose this. To enable/disable KMS, I
pass radeon.modeset=1 or 0 (respectively). To enable compiz, I turn on desktop
effects from within the System/Preferences/Appearance/Visual Effects in Ubuntu.
Checking Xorg.0.log, with KMS, EXA is enabled by default. Without KMS, XAA is
disabled by default. To force EXA or XAA, I create a simple xorg.conf and use
AccelMethod. Performance based on general responsiveness and resizing firefox
windows. 

Here are my findings:

* KMS/EXA/compiz: compiz crash (out of memory) (this bug, fairly easy to
reproduce with a couple of large applications (firefox and OO.o))
* KMS/EXA/no compiz: lockup, but much harder to reproduce (saw it once after
several hours of use)
* no KMS/XAA/compiz: lockup and garbling (https://launchpad.net/bugs/513950,
https://launchpad.net/bugs/513956)
* no KMS/XAA/no compiz (stable after several full days of use, but needs
RenderAccel "off" due to https://launchpad.net/bugs/513968)
* no KMS/forced EXA/compiz: limited testing, seems stable, but performance is
very poor. Had difficulty turning on compiz in all circumstances (see this
comment:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/513950/comments/4)
* no KMS/forced EXA/no compiz: limited testing, seems stable, but performance
is very poor

Performance with EXA and KMS is generally good. Performance with EXA and
without KMS is very poor. Performance with XAA without KMS is better than EXA
with KMS.

Note that I tried to force XAA when using KMS, by using AccelMethod "XAA", but
EXA was used anyway. Xorg.0.log gave:
...
(**) RADEON(0): Option "AccelMethod" "XAA"
...
(II) RADEON(0): EXA: Driver will not allow EXA pixmaps in VRAM
...
(II) Loading sub module "exa"
(II) LoadModule: "exa"
(II) Loading /usr/lib/xorg/modules/libexa.so
(II) Module exa: vendor="X.Org Foundation"
        compiled for 1.7.3.902, module version = 2.5.0
        ABI class: X.Org Video Driver, version 6.0
(--) Depth 24 pixmap format is 32 bpp
(II) RADEON(0): [DRI2] Setup complete
(II) RADEON(0): Front buffer size: 5808K
(II) RADEON(0): VRAM usage limit set to 20577K
(==) RADEON(0): Backing store disabled
(II) RADEON(0): Direct rendering enabled
(II) RADEON(0): Render acceleration enabled for R100 type cards.
(II) RADEON(0): Setting EXA maxPitchBytes
(II) EXA(0): Driver allocated offscreen pixmaps
(II) EXA(0): Driver registered support for the following operations:
(II)         Solid
(II)         Copy
(II)         Composite (RENDER acceleration)
(II)         UploadToScreen
(II)         DownloadFromScreen
(II) RADEON(0): Acceleration enabled
(==) RADEON(0): DPMS enabled
(==) RADEON(0): Silken mouse enabled
(II) RADEON(0): Set up textured video

This unsurprisingly resulted in the same out of memory bugs as KMS/EXA tests
above.


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