[Bug 70740] New: HiZ on SNB causes GPU hang with WebGL web app

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70740

          Priority: medium
            Bug ID: 70740
          Assignee: idr at freedesktop.org
           Summary: HiZ on SNB causes GPU hang with WebGL web app
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: joe.konno at linux.intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

If HiZ enabled on any recent Mesa on a "sandybridge" platform, the Chrome
browser with WebGL enabled will hang the GPU within 10-30 minutes. Not seen on
"ivybridge".

To reproduce on a "sandybridge" machine:
  1. Build Mesa with HiZ enabled
  2. Enable WebGL in the Chrome browser
  3. Log into Google Maps, and "try the new maps"

Expected result: Can enjoy WebGL web application to heart's content.

Actual result: Within 10-30 minutes, GPU hangs. Game over.

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