Bug 1833

Summary:	r200: use of stencil buffer in resolutions with no hw stencil may lead to gpu lockup
Product:	Mesa	Reporter:	Roland Scheidegger <sroland>
Component:	Drivers/DRI/r200	Assignee:	Default DRI bug account <dri-devel>
Status:	REOPENED ---	QA Contact:
Severity:	normal
Priority:	high	CC:	mirh, suokkos
Version:	git
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Roland Scheidegger 2004-11-11 11:34:59 UTC

If the stencil buffer is used in 16bit resolutions, a lockup may happen. I'm not
sure what's the culprit, maybe the swrast fallback has some problems?
This happened on a rv250. To reproduce, edit your xorg config to use a 16bpp
resolution. Start Quake3, enter /r_stencilbits 8, /vid_restart. As soon as
/cg_shadows 2 is entered (which enables stencil shadows), a gpu lockup occurs.
Kernel log showed
Nov 11 20:10:33 ZakTower kernel: [drm:drm_lock_take] *ERROR* 3 holds heavyweight
lock
CVS drm-core module was used.
So maybe it's actually not really a gpu lockup, but some locking trouble...

Comment 1 Oliver McFadden 2007-05-25 03:50:19 UTC

I just tested this with Mesa and DRM from Git and it works fine for me; no lockup.  If you can reproduce this with the latest Git, then please reopen the bug report.

Comment 2 Oliver McFadden 2007-05-25 03:52:42 UTC

I just made a silly mistake. I misread "R200" as "R300" and tested this on R300.
I'll change this to reopened now.

Sorry for the bugmail spam.

Comment 3 Adam Jackson 2009-08-24 12:22:52 UTC

Mass version move, cvs -> git

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