Thinkpad USB-C 40AS Dock not working

[currydaddy]

I currently have a Lenovo ThinkPad USB-C Dock Gen 2 (40AS0090) for my personal Thinkpad that works perfectly (monitor, keyboard, mouse, power). However, when I try to connect my Steam Deck via the USB-C connector, I am getting everything BUT the video output (so keyboard, mouse, and power is working). Does anyone know a solution to this problem? Does the Steam Deck have any missing drivers such as DisplayLink that I must manually install?

[Irziosa]

I am having the same issue. Everything except for the monitor works perfectly.

[GorathTheDestroyer]

Hey, hope this helps had the same issue with the previous model Type 40A9. After fiddling about with it I found that if you go into desktop mode, hit the proton menu, go into settings, select system settings, then select the tab for display configuration when it loads, you can do the following.
Next to the device drop down see if the monitor is truly detecting (the deck will show as a laptop screen and be set to enabled and primary). If you see your monitor in the drop down, before you do anything else click enable. Probably see nothing otherwise it would have already broadcast likely. Next dumb down the resolution of your monitor to 1080p and match the refresh rate to the deck at 60hz, then hit enable again. Let me know if that worked for you and remember, Luck is always belong to the justice!

[GorathTheDestroyer]

Oh and hit apply for each event trigger.

[Remy561]

The Thinkpad 40B0 thundebolt 4 dock detects my monitor but it only works with external display save mode on. This reduces the external video resolution to 720p 60fps, anything higher doesn't seem to work.
When using the Thinkpad 40AY the deck doesn't detect the display at all.

Both docks were updated to the latest firmware. So I guess Thinkpad docks aren't the best solution for Steamdeck right now.

[Mitch911]

Same here. I've only bought this dock to connect my laptop and my SteamDeck. So sad 😭

[Mitch911]

Find a solution, DisplayPort don't work but HDMI does 👌

[Mitch911]

OK, final solution: use DisplayPort on the top of the HDMI Port, not on the left

[Sbeven't]

Same here, 40AS does not seem to be working, neither hdmi, nor two DP ports.

[zer0din]

Also faced the same problem. It looks like some kind of bug in the system. The solution turned out to be simple. It is enough to connect and disconnect the usb-c cable several times. As a result, I received an image output to 3 external monitors.
https://steamcommunity.com/sharedfiles/filedetails/?id=2967551282

[madskas]

Model 40AY here. Yanking out the DisplayPort cable and using an HDMI cable instead worked for me.

After plugging in the Steam Deck to the hub after switching video output cables Desktop mode immediately asked me how to use the newly added display. The settings - use external only, 1920x1200 resolution - carried over (or just happened to be the same) in Gaming mode.

[z3roCoo1]

I have the same problem. Only way I can get it working is repeatedly unplugging and plugging the hdmi. Must be a better solution?

[z3roCoo1]

Originally posted by z3roCoo1:

I have the same problem. Only way I can get it working is repeatedly unplugging and plugging the hdmi. Must be a better solution?

Looks like it was fixed in a patch added to 6.1.5.arch2-1. Not filtered down to Steam Deck Holo yet.

[burningcorner]

Old thread, I know but I just bought me a refurbished 40AS. Everything works great with Steam Deck, Picture via HDMI and Display Port, Ethernet and USB. Except for Sound. This is strange, as my other Dock (JSAUX) passes Sound through on the same Monitor. Windows and Mac do work. Anyone got a solution for it?

[zer0din]

Updated the docking station firmware. Now there are no problems. The firmware is on the Lenovo website.

[andree]

I have 40AS, hub's USB ports are +- always detected, PD works, but no matter how many times I reconnect USB cable, video via HDMI doesn't. It works after combo

SD Power On
AS40 plugin plug in
Repeat a few times: HDMI out / HDMI in

After next AS40 reconnect, it needs to be done again... Pretty funny, that each answer ITT has a completely different workaround :)