Bug 22677

Summary:	[no-DRI] Extremly slow graphics with UXA + dualhead
Product:	xorg	Reporter:	Michal <michalodstrcil>
Component:	Driver/intel	Assignee:	Carl Worth <cworth>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	keithp
Version:	7.4 (2008.09)
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Michal 2009-07-08 14:19:28 UTC

When I try newest drivers intel-2.7.99 with card intel 945GM and I use parameter Virtual more than 2048*2048  in xorg.conf whole desktop is extremely slow. But when is the Virtual less than 2048^2 I get glxgears 380 but when it is bigger glxgears is ~5fps !!! and all graphic was unusable.

This problem is only with newest drivers and when I use parameter virtual to be able to extent desktop to the second monitor. There are no errors in Xorg log connected to this except that DRI is not supported for >2048^2.

I can get some more info but I don't know what would help you.

Comment 1 Gordon Jin 2009-07-08 23:23:52 UTC

You don't get DRI acceleration if you set >2048 on pre-965.

> This problem is only with newest drivers
I'm interested to know which "old" driver version works for you?

Comment 2 Michal 2009-07-08 23:36:21 UTC

I'm was using 2.6.1 because with drivers 2.6.3 - 2.7.1 the video didn't work (http://bugs.freedesktop.org/show_bug.cgi?id=21820), but UXA works fine with 2.7.1. 

I don't use UXA with old drivers but XAA, it works best for me with all drivers <2.6.3.
I know that DRI will newer work, but still the drivers should be faster than 5fps.

The new drivers I used are called xf86-video-intel-2.7.99.901 in gentoo portage.

Comment 3 Gordon Jin 2009-07-08 23:48:16 UTC

so it's said to be a regression from 2.7.1 to 2.7.99.901, both with UXA.

Comment 4 Michal 2009-07-09 00:07:49 UTC

I forgot to write that the dualhead didn't work with the newest drivers. It can only clone the screen but with drivers >2.7.1 I can't get dualhead work. So it is slow and the dualhead doesn't work.
I also check the version from git://anongit.freedesktop.org/git/xorg/driver/xf86-video-intel and the problem is the same.

Comment 5 Gordon Jin 2009-07-09 00:35:50 UTC

I expect people should meet bug#21190 with >2.7.1 as UXA enabled.

Comment 6 Gordon Jin 2009-07-14 19:12:14 UTC

#21190 has been fixed for 945

Comment 7 Keith Packard 2009-07-14 19:46:32 UTC

2D performance should be fine for large (>2048) frame buffers. With DRI2, 3D performance should be acceptable on large frame buffers as long as the window is not larger than 2048 pixels. These are hardware limitations.

2D performance was broken, and fixed along with 21190, so I'm marking this bug fixed as well.

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