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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
The source will be the invalid EDID - we use it to confirm that you have a DVI
connection. You can do a bisect to find which commit aggravated the issue for
you. It might be something wrong in the comms protocol, e.g. switching to using
GMBUS rather than GPIO, caused more frequent failure, but if the monitor always
has returned invalid EDID at some point, then I'm not optimistic that it will
be that. My guess is that the bisect would report that the offending commit is
one that causes to try less hard to recover a broken EDID.

But maybe the bisect would be a surprise and we find a genuine bug.

Whilst I would appreciate a bisect, it may take a few days to perform, longer
based on how long it takes for the invalid EDID to generate a disconnect.
Overriding the EDID would take a couple of minutes to setup, so I can
understand if you just did the workaround.

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