[Bug 89578] New: [IVB CPU eDP] local flat panel stays blank

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89578

            Bug ID: 89578
           Summary: [IVB CPU eDP] local flat panel stays blank
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: linux at rempel-privat.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org,
                    jani.nikula at intel.com

This clean repost of Bug 48652, as was requested by Jani Nikula.

Short summary:
- reproducible with current drm-intel-nightly.git f7def439e21ca 14.03.2015

- affected hardware: Asus Zenbook ux31a
Vendor: 0x8086, Device: 0x0166, Revision: 0x09 (??)
render clock: unknown  sampler clock: unknown

- if external VGA is attached, internal eDP will stay blank.
- known workaround: switch from VGA to eDP in grub or BIOS
- it is not possible to configure BIOS to use eDP as default output.

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