rhgb boot -> monitor losing signal (sometimes)

[Michael Schwendt]

This has been happening some time since F-15. Not always, but occasionally
multiple times in a row. With F-16 I had believed it was gone, especially
when the boot screen switched to grey colours, but it still happens:

Shortly before the Plymouth LUKS passphrase prompt, the screen turns black,
the monitor reports "No signal" and enters power-saving mode. The system
hasn't crashed, because instead of pressing Ctrl+Alt+Del I can also enter
the passphrase blindly for the boot procedure to continue. However,
nothing "wakes up" the monitor afterwards. Switching to a virtual console
causes the signal to return, and what is displayed on the screen is not
GDM but the gray background with the central animation having reached
100% or nearly that. There is no virtual console available, and one cannot
return to GDM either.

Any hints on what I could try out? Or any theories about what could be
the culprit?

My obvious work-around is to boot without "rhgb".

-- 
Fedora release 16 (Verne) - Linux 3.1.0-0.rc9.git0.0.fc16.x86_64
loadavg: 0.89 0.42 0.16