Bug 20672

Summary:	Sync to vblank does not work on X1300 Mobility
Product:	Mesa	Reporter:	Christian Speckner <cnspeckn>
Component:	Drivers/DRI/r300	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	xorg.conf xorg logfile

Description Christian Speckner 2009-03-15 06:38:19 UTC

When I enable any vsync mode in driconf, glxgears takes some seconds to display anything besides a black window, then garbage, and after that, it renders correctly with a very slow framerate (<1 fps). Other 3D applications display the same behaviour. If I enable interrupts instead of sleeps, I additionally get the following message:

do_wait: drmWaitVBlank returned -1

This is mesa 7.3 (there was no option for that one above, so I set unspecified). I am using xorg-server 1.5.3 on gentoo together with the radeon driver 6.12.0. The machine is a thinkpad T60/Core duo (no Core2, so 32 bit) with a X1300 mobility radeon.

I have attached xorg.conf and Xorg.0.log; please tell me if you need any further info.

Comment 1 Christian Speckner 2009-03-15 06:39:09 UTC

Created attachment 23870 [details]
xorg.conf

Comment 2 Christian Speckner 2009-03-15 06:39:25 UTC

Created attachment 23871 [details]
xorg logfile

Comment 3 Christian Speckner 2009-03-15 06:40:46 UTC

Oh, in case anyone is interested, drm is in-kernel drm, linux 2.6.27.

Comment 4 Michel Dänzer 2009-03-16 02:09:59 UTC

Does

watch grep radeon /proc/interrupts

show an increase in the number of interrupts received from the Radeon which roughly corresponds to the display refresh rate?

Comment 5 Christian Speckner 2009-03-16 03:45:13 UTC

No, it doesn't; no interrupts seem to be generated.

Comment 6 Michel Dänzer 2009-03-16 03:55:43 UTC

Did you check with and without glxgears or another 3D app running?

Comment 7 Christian Speckner 2009-03-16 04:00:33 UTC

Yep, I did. "grep radeon /proc/interrupts" gives

16:          1          0   IO-APIC-fasteoi   yenta, uhci_hcd:usb2, radeon@pci:0000:01:00.0

which doesn't change on running glxgears.

Comment 8 Michel Dänzer 2009-03-16 04:13:50 UTC

This is most likely an issue in the kernel then, or possibly in xf86-video-ati. Can you try a newer kernel (e.g. 2.6.28.x) or the DRM kernel modules from git://anongit.freedesktop.org/git/mesa/drm ?

Comment 9 Christian Speckner 2009-03-16 04:27:49 UTC

On the spot, thanks! I just tried the git drm modules, and it now works fine.

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