[Bug 38074] Dual head doesn't work for some combination of monitors (second screen still off)

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38074

--- Comment #5 from Jaromír Cápík <jcapik@redhat.com> 2011-07-28 09:33:22 PDT ---
>It seems plausible the 1280x1024 display only works because
>it's using the analog function of the connector and not the digital.
>I suspect that if you plugged another display in digitally
>on that port it'd still fail.

According to my NOTE #2 it's possible ...

>How exactly does it fail by the way,
>just the second display not showing an image?

Second display probably has no signal or unsupported signal (LED blinking and
display seems to be off).

>If you boot with a 1920x1080 display on the left connector,
>and plug the right, what happens?  What about the reverse?
>(Just trying to rule out if it's a problem with a particular
>connector, or with programming an output without vbios assistance).

I've tried to swap the connectors, and the result was the same.
The problem is always with DVI-I-2.
If I try to boot with monitor connected in DVI-I-2 only, then I see post
messages
and GRUB, but once the kernel starts booting and activate the framebuffer,
then the screen on DVI-I-2 goes black (and LED starts to blink) and the rest
of the kernel boot messages is being displayed on DVI-I-1 (disconnected at that
moment) ....

That means ... DVI-I-1 always works, DVI-I-2 never works

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