[Bug 88012] New: Baytrail complete freeze after: 31685c258e0b0ad6aa486c5ec001382cf8a64212 (bisected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88012

            Bug ID: 88012
           Summary: Baytrail complete freeze after:
                    31685c258e0b0ad6aa486c5ec001382cf8a64212 (bisected)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: fritsch at xbmc.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

We experienced strange full system freezes on Asrock Q1900 hardware with our
OpenELEC 5.0 release. No errors were visible via netconsole, the whole system
just fully hung.

We then started to bisect between kernel 3.13 and 3.18 stable. It was verified
before that 3.19-rc2 is also affected.

Commit: 31685c258e0b0ad6aa486c5ec001382cf8a64212 drm/i915/vlv: WA for Turbo and
RC6 to work together 

was found to be the first bad commit in that bisect.

A manual workaround was to set the max cstate to C1 (via BIOS), which
workarounded this bug.

We currently have > 10 users that are affected by this bug (mostly Asrock Q1900
users).

You can see the complete bisecting steps here:
https://github.com/OpenELEC/OpenELEC.tv/issues/3726#issuecomment-68626603

I will ask that user to subscribe to this tracker. As we freeze very hard, it's
not possible to add logfiles as the netconsole stays empty for us.

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