[Bug 77951] New: "intel_pstate: Set turbo VID for BayTrail" causes stall on Intel NUC DN2820FYKH

* [Bug 77951] New: "intel_pstate: Set turbo VID for BayTrail" causes stall on Intel NUC DN2820FYKH
@ 2014-06-15 13:45 bugzilla-daemon
  2014-06-15 13:46 ` [Bug 77951] " bugzilla-daemon
  2014-06-16  2:30 ` bugzilla-daemon
  0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2014-06-15 13:45 UTC (permalink / raw)
  To: cpufreq

https://bugzilla.kernel.org/show_bug.cgi?id=77951

            Bug ID: 77951
           Summary: "intel_pstate: Set turbo VID for BayTrail" causes
                    stall on Intel NUC DN2820FYKH
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.15
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
          Assignee: cpufreq@vger.kernel.org
          Reporter: rune@megahurts.dk
        Regression: No

The hardware:
DN2820FYKH (BIOS version:0028)

The symptom:
The kernel stalls at "Loading, please wait" or sometimes at the the next line
where udevd is launched.

I did a bisect which identified the commit
21855ff5bcbdd075e1c99772827a84912ab083dd "intel_pstate: Set turbo VID for
BayTrail" as the cause.

I also confirmed it by reverting the commit on v3.15 which fixed the stall.

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