[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 #18 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Tom Yan from comment #16)
> I tried to remove the DisplayPort-specific code in
> radeon_connector_hotplug() of radeon_connector.c and everything seems to
> work like a charm. What is the code supposed to do actually?
> 

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.

> Though, btw, it seems that only turning off my DP monitor in X would make it
> "dead". Doing that in console (or switch to console before turning it on)
> does not.
> 

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)?

(In reply to Tom Yan from comment #17)
> One thing to add, unplugging it physically in X still makes it blank. It
> happens no matter the code is removed or not.

That code is required to re-establish the link.

> 
> Also, HDMI doesn't work all time yet, seems that if the TV is powered off
> and it goes into DPMS after sometime (in console), the display still gone
> completely.

Are you physically powering off the TV or do you mean dpms?

-- 
You are receiving this mail because:
You are watching the assignee of the bug.