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No Thunderbolt Display Output on T470

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  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

#505 — No Thunderbolt Display Output on T470

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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#506

   I understand you're using Arch, but had you tried seeing if it works 
under Microsoft Windows?  Or do you have a USB-C thumbdrive that might 
show as bootable in BIOS?

   Either way, the TB port on these laptops is a ticking time bomb and 
there's been a lot of chatter about why and if/how it could be fixed.

   Have a look at:
* 
https://www.reddit.com/r/thinkpad/comments/eszg2o/thinkpad_tb3_failure_what_we_know_repair/

* 
https://www.notebookcheck.net/ThinkPad-Thunderbolt-3-failure-What-s-happening-why-it-s-happening-and-how-to-fix-it.451207.0.html

   tl;dr, the non-volatile memory backing the TB controller burns out. 
You might be able to fix it and/or solder a new chip and/or replace the 
motherboard.  Be careful replacing the motherboard if you go that route, 
as a **lot** of these machines suffered this failure, and a lot of 
replacement motherboards have dead TB ports.

On 2023-07-02 7:09 p.m., Tedward wrote:
> 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?

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