[Bug 105891] miniDP to external monitor with DVI-D via miniDP to HDMI/DVI-D/DP adapter : DP dual mode HDMI ID: (err -6) and blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105891

--- Comment #7 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Somehow the entire dongle seems to disappear when you plug it into the bad
monitor. That's causing the drm_dp_dual_mode_detect() difference. Also it seems
to affect the DP AUX channel somehow as the timeouts that I would expect to see
are no longer there.

So my theory is that somehow the dongle does not detect your bad monitor and
defaults into some kind of DP passthrough mode instead. The dongle has a DP
output also right? That could perhaps explain why nothing is detected, and also
why no picture goes through when you override the EDID.

Did you try different cables between the dongle and the display? Also trying
both the DVI and HDMI oputputs of the dongle is worth a shot. And if the
monitor has multiple DVI/HDMI inputs you should also try all of them. If none
of that helps then I'm afraid it looks like you need to either get another
dongle, or another display.

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