[ltp] Re: Which Thinkpads easiest to display on external HDMI?

Marius Gedminas linux-thinkpad@linux-thinkpad.org
Mon, 16 Jun 2014 15:53:49 +0300

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On Mon, Jun 16, 2014 at 04:48:35AM -0700, keitho@strucktower.com wrote:
> > Did you try it? ...
> > Evgeni
> Yes, I should have said.

When you run xrandr, do you see anything about HDMI1/DP1?

Another thing: when I plug in an external monitor to my X220 (integrated
Intel video) using a DisplayPort -> DVI cable, it's usually not
autodetected (in like 95%) because of I-don't-know-what, the hotplug
interrupt happens before the monitor is ready to talk EDID over DDC or
something.  I have to manually trigger an xrandr query to get the
external monitor to be autodetected.

> From: Micha Feigin
> >     Not sure about the hardware in the thinkpad. I would think that it
> >     would have a dual purpose displayport / hdmi port, but if it
> >     doesn't, you can get an active displayport to hdmi, would be cheaper
> >     than another laptop. <br>
> Hmmm... I'll study that a bit. But I assume that in my T520. there is no
> physical connection of the DisplayPort to anything...
> ThinkWiki says:
> "The T520 also requires Discrete Graphics to use DisplayPort. "

That might only apply to Optimus models.

It wouldn't make any sense to include a DP connector in a laptop that
cannot ever be used.

Marius Gedminas
Seen on a button at an SF Convention:
Veteran of the Bermuda Triangle Expeditionary Force.  1990-1951.

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