Bug 94468 - [HSW, regression, bisected] numerous Sascha demos render incorrectly
Summary: [HSW, regression, bisected] numerous Sascha demos render incorrectly
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Vulkan/intel (show other bugs)
Version: git
Hardware: Other All
: medium normal
Assignee: Jordan Justen
QA Contact: Intel 3D Bugs Mailing List
Depends on:
Reported: 2016-03-09 19:40 UTC by Nanley Chery
Modified: 2016-05-17 20:13 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:

Incorrectly rendered demo (231.49 KB, image/png)
2016-03-09 19:40 UTC, Nanley Chery

Description Nanley Chery 2016-03-09 19:40:38 UTC
Created attachment 122184 [details]
Incorrectly rendered demo

On Gen7, and prior the following commit:

commit 248ab61740c4082517424f5aa94b2f4e7b210d76
Author: Jason Ekstrand <jason.ekstrand@intel.com>
Date:   Tue Mar 8 17:10:05 2016 -0800

    anv/cmd_buffer: Pull the core of flush_state into genX_cmd_buffer

the Sascha Willems vulkanscene demo was rendering correctly. Now however, a gray oval is rendered in the middle of the demo.

Comment 1 Nanley Chery 2016-03-09 21:32:30 UTC
With further testing, I've determined that a number of demos besides vulkanscene are affected.
Comment 2 Jason Ekstrand 2016-03-09 22:19:25 UTC
Turns out that the problem is that calling cmd_buffer_config_l3 isn't safe to do when rendering on gen7.  We need to fix that.  Re-assigning to Jordan.
Comment 3 Jason Ekstrand 2016-03-12 16:59:08 UTC
I just pushed a band-aid patch that doesn't actually solve the problem but does get it back to working as well as it did before:

commit 41af9b2e517dd0c17e519490ca915b96f6898390
Author: Jason Ekstrand <jason.ekstrand@intel.com>
Date:   Sat Mar 12 08:54:41 2016 -0800

    HACK: Don't re-configure L3$ in render stages pre-BDW
    This fixes a "regression" on Haswell and prior caused by merging the gen7
    and gen8 flush_state functions.  Haswell should still work just fine if
    you're on a 4.4 kernel, but we really should make it detect the command
    parser version and do something intelligent.
Comment 4 Jordan Justen 2016-03-12 23:42:37 UTC
I've tried (unsuccessfully) to reproduce this on
two Haswell systems.

Device: Mesa DRI Intel(R) Haswell Mobile  (0xa26)

Device: Mesa DRI Intel(R) Haswell Mobile  (0xa2e)
Comment 5 Lionel Landwerlin 2016-05-10 21:06:52 UTC
I've had a similar problem with the vkcube demo (https://github.com/krh/vkcube) on my MacBook Air HSW :


I wonder whether that's the same issue.

Interestingly enough the cube demo from https://github.com/LunarG/VulkanTools.git works.

My system : Device: Mesa DRI Intel(R) Haswell Mobile  (0xa26)
Comment 6 Jordan Justen 2016-05-17 20:13:17 UTC
Jason had a workaround patch to fix this previously, but
hopefully it is fixed without the workaround as of

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