Bug 82759

Summary: [HSW] very visible rendering errors from fast clear change
Product: Mesa Reporter: Tapani Pälli <lemody>
Component: Drivers/DRI/i965Assignee: Kristian Høgsberg <krh>
Status: RESOLVED FIXED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: major    
Priority: medium CC: eero.t.tamminen, jianx.zhou
Version: git   
Hardware: Other   
OS: All   
See Also: https://bugs.freedesktop.org/show_bug.cgi?id=82796
Whiteboard:
i915 platform: i915 features:
Attachments: steam ui screenshot
dota loading screenshot

Description Tapani Pälli 2014-08-18 09:56:34 UTC 
Steam UI and Dota2 loading screen have black tiles in them, attached screenshot tells more than words.

Tested this on HSW machine, 64bit Ubuntu 14.04 and 32bit Mesa (dota2 is 32bit)

Bisected to following commit:
--- 8< ---
commit 2f28a0dc23165123cf1e8b5942acad37878edd8a
Author: Kristian Høgsberg <krh@bitplanet.net>
Date:   Mon Jul 7 16:44:58 2014 -0700

    i965: Implement fast color clears using meta operations
    
    This patch uses the infrastructure put in place by previous patches
    to implement fast color clears and replicated color clears in terms of
    meta operations.
    
    This works all the way back to gen7 where fast clear was introduced and
    adds support for fast clear on gen8.  It replaces the blorp path
    completely and improves on a few cases.  Layered clears are now done
    using instanced rendering and multiple render-target clears use a
    MRT shader with rep16 writes.
    
    Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
    Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Comment 1 Tapani Pälli 2014-08-18 09:57:08 UTC 
Created attachment 104809 [details]
steam ui screenshot
Comment 2 Tapani Pälli 2014-08-18 09:57:24 UTC 
Created attachment 104810 [details]
dota loading screenshot
Comment 3 Eero Tamminen 2014-08-18 10:53:04 UTC 
Is also visible in Synmark's Batch* tests, so this can be trivially caught by its validation.  Besides the vertical stripes, there's also noise visible in some of the triangles, so there might be even couple of separate issues.

Happens only on HSW (GT3e), not on IVB or BYT.
Comment 4 Tapani Pälli 2014-08-18 12:04:16 UTC 
We tried with Curro on HSW GT2 and did not reproduce the errors (using Synmark tests).
Comment 5 Eero Tamminen 2014-08-20 13:58:34 UTC 
I'm not seeing issues listed in this bug anymore [1], but bug 82796 issue (with Synmark CPU<->GPU communication terrain tests) still remains.

[1] Maybe fixed by: e6a53533b7aa790f66b044f77deaac450aa39fde

Tapani, what about you, can this be set as fixed?
Comment 6 Tapani Pälli 2014-08-22 04:26:13 UTC 
yes
Comment 7 Eero Tamminen 2014-08-22 06:39:59 UTC 
*** Bug 82891 has been marked as a duplicate of this bug. ***

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