Bug 19268

Summary:	UXA broken with VT switching
Product:	xorg	Reporter:	Eric Anholt <eric>
Component:	Driver/intel	Assignee:	Wang Zhenyu <zhenyu.z.wang>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	major
Priority:	high
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	18858

Description Eric Anholt 2008-12-23 18:39:15 UTC

since aae4008096399a0e84abc7c016b35092caf9db25 of the 2D driver, VT switching back in with UXA triggers a kernel BUG.  The BUG is legit, it seems -- objects got pinned while dev_priv->mm.suspended, which we overlooked when planning the GTT lookaside hack in userland.  Switching back to EXA or reverting the commit works around it.

Marking it as a 2D blocker, as the kernel fix will likely result in userland needing fixing.

Comment 1 Eric Anholt 2008-12-23 18:47:53 UTC

kernel half of the fix posted to intel-gfx.

Comment 2 Gordon Jin 2008-12-23 19:18:20 UTC

That commit is only on master branch, not on xf86-video-intel-2.6-branch, so not in the release (candidate) yet.

Since Eric will be on vacation, I'm assigning it to Zhenyu.

Comment 3 Gordon Jin 2008-12-26 00:50:45 UTC

For reference, aae4008096399a0e84abc7c016b35092caf9db25 fixed bug#19010,19014,19074.

Comment 4 Eric Anholt 2008-12-31 11:33:55 UTC

commit 1f61e97904dfe5f8c08bb9f284cfdfe878f7e541
Author: Zhenyu Wang <zhenyu.z.wang@intel.com>
Date:   Wed Dec 31 22:56:57 2008 +0800

    UXA: Fallback to dri_bo_map() if pin failed
    
    This fixes VT switch issue with UXA after Eric's
    aae4008096399a0e84abc7c016b35092caf9db25 on 2D side.

Comment 5 Michael Fu 2009-01-05 18:07:38 UTC

"after the patch, there are still bad wrong render results after VT switch" - zhenyu

reopen this bug...

Comment 6 Gordon Jin 2009-01-05 18:44:09 UTC

Since the kernel BUG has been fixed by Eric, and the remaining issue is just rendering, I'm decreasing the severity so this won't block Q4 release.

Comment 7 Eric Anholt 2009-01-06 11:27:03 UTC

commit 342120be0956bfc12822d1ffbfbd8aaabf3e922f
Author: Eric Anholt <eric@anholt.net>
Date:   Mon Jan 5 23:21:07 2009 -0800

    Fix pin leakage with EXA GTT-mapping shortcut, and crash with UXA on KMS.

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