[Bug 71461] monitor doesn't get detected after boot or disconnection

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71461

--- Comment #19 from Tom Yan <tom.ty89@gmail.com> ---
(In reply to Alex Deucher from comment #18)
> It's required to re-establish the DP link if you physically disconnect and
> reconnect an active display since DP requires link training while other
> digital links do not, otherwise you'd end up with a blank display after
> disconnecting and reconnecting a DP display.  It sounds like may have a
> problem with the hpd interrupts on your board.

Unfortunately it doesn't work as intended but only cause some side effect, at
least for my case. FYR my board is Sapphire HD5850 Toxic, and my monitor is
EIZO EV2336W.

> How are you turning it off in X vs console?  Are you physically powering the
> monitor off or triggering dpms (e.g., xset dpms force off)?

All "turning it off" mean physically powering it off. I even tried unplugging
the power today.

> Are you physically powering off the TV or do you mean dpms?
In the case that I found out the problem, I was nuking a disk in console, so I
physically powered off the TV after I ran the command. When I turn on my TV
again after a long time, I can't get back the display.

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