[Bug 102312] New: [regression] no output on HDMI until Xorg starts after upgrade to kernel 4.12.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102312

            Bug ID: 102312
           Summary: [regression] no output on HDMI until Xorg starts after
                    upgrade to kernel 4.12.5
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dominik at greysector.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This is on a Sony Vaio Pro 13 (Haswell) running Fedora 26.

After upgrading from kernel-4.11.11-300.fc26.x86_64 to 4.12.5-300.fc26.x86_64,
I no longer get any video output (in particular: the LUKS password prompt) on
the external monitor connected to the HDMI port. It's only displayed on the
internal LCD. The external monitor shows the expected video output only after
Xorg starts.

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