[Bug 90804] System "forgets" about its DVI output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90804

--- Comment #10 from Stephen Kitt <steve at sk2.org> ---
I've replaced the DVI cable, but it hasn't fixed things (I even tried with a
third DVI cable).

I can trigger this reliably by switching inputs on the monitor; this has always
logged invalid EDIDs, but only recently has it caused the system to forget it's
there. I've noticed that whichever VT is selected when I switch inputs is the
one that goes away; if it's a console VT though, all the console VTs go and I
haven't found a way to get them back. An X VT won't come back either but I can
restart X and that restores the display (most of the time).

Should I just go for the stored EDID approach? Or is there some change I could
revert somewhere?

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