Bug 9845

Summary: localAllocateOffscreenLinear broken with granularity > 1
Product: xorg Reporter: Jim Duchek <jim.duchek>
Component: Server/GeneralAssignee: Xorg Project Team <xorg-team>
Status: RESOLVED DUPLICATE QA Contact: Xorg Project Team <xorg-team>
Severity: major    
Priority: high Keywords: patch
Version: git   
Hardware: x86 (IA32)   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Fixes bug (see bug) none

Description Jim Duchek 2007-02-01 22:56:52 UTC 
Granularity > 1 will cause linear->offset to be (generally) doubled.  This is quite bad if running OpenGL for whatever reason (AIGLX+Beryl) is mine, and attempting to do XVideo (on the Radeon at least -- haven't checked to see if it applies to other drivers' video implementation).  Either way it needs to be fixed.  I couldn't find a bug that seems to be related, although some other xvideo bugs (especially those regarding corruption) _might_ be.

Attaching a patch.
Comment 1 Jim Duchek 2007-02-01 22:58:23 UTC 
Created attachment 8578 [details] [review]
Fixes bug (see bug)
Comment 2 Daniel Stone 2007-02-27 01:36:08 UTC 
Sorry about the phenomenal bug spam, guys.  Adding xorg-team@ to the QA contact so bugs don't get lost in future.
Comment 3 Matt Turner 2010-12-03 14:16:11 UTC 
Wow, this was fixed in 2007.

commit 024bbc7cbb924daaf3e305ddfc8e74509acd1e15
Author: Eric Anholt <eric@anholt.net>
Date:   Tue Mar 6 16:18:59 2007 -0800

    Bug #9931: Fix linear allocations with a non-1-byte granularity.
    
    This was introduced in 83080809f9a1c1d24b0318e54632f25f5940da25.  Instead of
    aligning the offset, it doubled it.  Results were appropriately spectacular.

*** This bug has been marked as a duplicate of bug 9931 ***

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