[Bug 102312] [HSW] 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

--- Comment #7 from Dominik 'Rathann' Mierzejewski <dominik at greysector.net> ---
One additional data point: if I remove 'rhgb' and 'quiet' from the kernel
command line, I can see kernel messages scrolling up the screen after booting
the kernel, but very soon, the screen goes blank. I assume this happens around
the same time as the LUKS prompt appears, because if I type the password
blindly, the system continues to start and I get the X login screen soon
afterwards. The external monitor connected via HDMI remains in sleep mode until
Xorg starts.

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