[Bug 101406] [BSW] CarChase benchmark misrenders

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101406

            Bug ID: 101406
           Summary: [BSW] CarChase benchmark misrenders
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 131926
  --> https://bugs.freedesktop.org/attachment.cgi?id=131926&action=edit
Screenshot of the problem

Setup:
- Ubuntu 16.04
- BSW NUC (N3050)
- Latest 3D stack (kernel, X, Mesa)
- GfxBench v4 from gfxbench.com


Use-case:
- Run GfxBench CarChase ("gl_4") test

Expected outcome:
- Renders fine like on other platforms, and like the other GfxBench tests

Actual outcome:
- Mountains and some tree trunks are not rendered, bushes hang in the sky
  (see attached screenshot)

I'm not sure whether this is a regression, or has this just been broken since
Mesa started supporting GL 4.3, and this benchmark started working on other
platforms (it uses compute shaders & tessellation).  I went back several months
and the same issue is visible at least already in mid February.

(There's also some issue with cursor planes on BSW, cursor gets duplicated when
you move it, but that's kernel/X problem and I think unrelated.)

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