Groups > comp.sys.laptops.thinkpad > #505

No Thunderbolt Display Output on T470

From	Tedward <usenet@xy0.org>
Newsgroups	comp.sys.laptops.thinkpad
Subject	No Thunderbolt Display Output on T470
Date	2023-07-02 23:09 +0000
Organization	A noiseless patient Spider
Message-ID	<u7t02t$3ejui$1@dont-email.me> (permalink)

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I assumed since it's a Thunderbolt 3 port that it would support Display
Port out, but I'm unable to get any video signal.

I am running Arch Linux. Under xrandr I see the following screens: eDP1,
DP1, DP2, HDMI1, HDMI2 and VIRTUAL1. I am using HDMI2 without any issues
to drive my external monitor but it's limited to 4k@30hz only while the
DP over Thunderbolt should be capable of 4k@60hz. Trouble is, I haven't
been able to find a way to get a signal out of that port. Even xrandr
shows it as disconnected while plugged in. Similarly, plugging in a
USB-C device to charge over the port does not register anything on
either the charging device or the laptop via dmesg. So, I'm at a loss.
Is this port busted or is there a setting somewhere I've missed to
enable it?

// T

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Thread

No Thunderbolt Display Output on T470 Tedward <usenet@xy0.org> - 2023-07-02 23:09 +0000
  Re: No Thunderbolt Display Output on T470 psvrh <d_spam@generaleclectic.org> - 2023-07-04 12:16 -0400

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