[Bug 90014] New: CPU core 1/4 stuck at 100% load only if i915 is loaded

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90014

            Bug ID: 90014
           Summary: CPU core 1/4 stuck at 100% load only if i915 is loaded
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gianguidorama at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115054
  --> https://bugs.freedesktop.org/attachment.cgi?id=115054&action=edit
dmesg of running system

Hardware: Retina MacBook Pro 13", Intel Core i5 4258U with Intel Iris 5100
integrated graphics.

Distribution: Ubuntu 15.04 daily release
Kernel version: 3.19.0-13-generic

Output from glxgears -info:
GL_RENDERER   = Mesa DRI Intel(R) Haswell 
GL_VERSION    = 3.0 Mesa 10.5.2
GL_VENDOR     = Intel Open Source Technology Center

This bug affects all distributions using kernels after 3.14.

On my hardware, 1 core of 4 is stuck at about 70% load, even without any
CPU-intensive operation running.

If the system is booted without loading i915 module the CPU load stays at
normal levels.

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