Bug 40111

Summary:	Heavy flickering in XBMC with Gallium r600, but not with classic Mesa
Product:	Mesa	Reporter:	Timo Jyrinki <timo.jyrinki>
Component:	Drivers/Gallium/r600	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	Xorg.0.log

Description Timo Jyrinki 2011-08-15 11:59:30 UTC

With Mesa 7.11, there is a heavy flickering in XBMC 10.1 (xbmc.org) right from the start. I found out a remark 73 at http://www.x.org/wiki/RadeonProgram mentioning the same from February, and it seems to hold true still.

With classic mesa r600 everything seems to work without problems, including GLSL output shaders.

Comment 1 Michel Dänzer 2011-08-16 01:41:00 UTC

I don't see any flickering with r600g from current Mesa Git master. If you can still reproduce it with that, please provide detailed reproduction steps and attach Xorg.0.log.

Comment 2 Timo Jyrinki 2011-08-16 03:47:27 UTC

Created attachment 50261 [details]
Xorg.0.log

Comment 3 Timo Jyrinki 2011-08-16 03:52:19 UTC

Same problem with Ubuntu/xorg-edgers provided 7.12.0~git20110811.9cd64ec3-0ubuntu0sarvatt~natty, both with compiz+Unity and with metacity.

Steps:
1. Have Ubuntu 11.04 or equivalent, x86_64, Radeon HD 4670, latest mesa with r600 gallium
2. Install XBMC 10.1 from for example http://ppa.launchpad.net/timo-jyrinki/ppa/ubuntu/pool/main/x/xbmc/
3. Launch xbmc - immediate full screen flickering (between correct main menu image and black screen, ca. 5-30 fps depending on what's being redrawn)

Comment 4 Michel Dänzer 2011-08-16 10:33:11 UTC

Does the problem go away if you disable page flipping? (check in Xorg.0.log that it's actually disabled)

Comment 5 Timo Jyrinki 2011-08-17 01:29:18 UTC

I reverted to stable ati/mesa/libdrm releases after noticing that latest git doesn't help. But now for testing the flipping option I installed again the latest build available, and lo and behold, the flickering is gone also with gallium and without changing any settings! Naturally just when I report a bug, something between git20110811.9cd64ec3 and git20110816.5e7713ca fixes it. I see that there is a whole lot of r600g commits there.

So, fixed! And if I find out some magic to make it flicker it again, I'll report it.

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