Bug 35165

Summary: [SNB]Flashing spots come out when running Enemy-territory
Product: Mesa Reporter: meng <mengmeng.meng>
Component: Drivers/DRI/i965Assignee: Kenneth Graunke <kenneth>
Status: VERIFIED DUPLICATE QA Contact:
Severity: major    
Priority: medium CC: bo.b.wang
Version: git   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: The photo for screen mess
Xorg

Description meng 2011-03-09 17:06:13 UTC 
System Environment:
-------------------------------------------------------------------
Platform:  SNB
Libdrm:    (master)2.4.24-6-g3b04c73650b5e9bbcb602fdb8cea0b16ad82d0c0
Mesa:      (7.10)3ed9054cc598a38d2cbcadd3f81943635148514c
Xserver:   (master)xorg-server-1.10.0
Xf86_video_intel:       
           (master)2.14.901-2-g049ce4397ddf7fd088ce364cbb53cacf5133176f
Kernel:    (drm-intel-fixes) 91355834646328e7edc6bd25176ae44bcd7386c7 

Bug detailed description:
-------------------------
When running enemy-territory, flashing spots come out and some trees become dimness possibly on SNB. And it could work normally again sometimes.It works fine on Piketon.It also existed on 2010Q4 release.Pls see attached photo.

Reproduce steps:
----------------
1. start X
2. run enemy-territory
3. MAIN--HOST GAME—START SERVER
Comment 1 meng 2011-03-09 17:11:23 UTC 
Created attachment 44291 [details]
The photo for screen mess
Comment 2 meng 2011-03-09 17:11:57 UTC 
Created attachment 44292 [details]
Xorg
Comment 3 Joel 2011-07-31 18:21:35 UTC 
A wild guess (N.B.) of mine is that this is caused by mesa doing some error with z-coordinates. In meng's screenshot it's seen as sky being mixed over the tree's texture, in a checkerbox pattern.

I've observed similar pattern on trees in Neverwinter nights, but it's much more visible on certain overlapping items on the ground. For example I can see through rugs and other flat textures easily. But other geometries are less affected. (I have a good screenshot of this available if anyone is interested)

The pattern is also not constant in NWN, but changes all the time like unstable pixels.
Comment 4 Joel 2011-08-30 04:48:05 UTC 

*** This bug has been marked as a duplicate of bug 39730 ***

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