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Which dock for Thinkpad X1 Extreme Gen 2 or Thinkpad P1 Gen 2 with multiple monitors?

2019-12-01, 17:43 PM

I'd like to share my experiance and discuss which dock is appropriate for either one of the Thinkpad X1 Extreme Gen 2 or Thinkpad P1 Gen 2 Laptops when run with Linux. These both models seem to be almost identicaly by hardware.


Obviously, the description on the Lenovo support pages is wrong, since different links provide different information. This is at least the case for the 'UBS-C doc Gen 2' (40AS0009) .

One page says it is compatible, there: https://accessorysmartfind.lenovo.com/#/products/40AS0090EU .

But another page says it is not, there: https://support.lenovo.com/lk/en/accessories/ACC500106 

Both pages say, it can run at most one Monitor with 4K @60Hz. But practically, in contrast to this, I do run it right now with 3 monitors at once:  

  • Monitor1 : 4K @ 60Hz by DP
  • Monitor2 : 4K @ 60Hz by DP
  • Monitor3 : 1920x1200 @ 60Hz by HDMI


According to the spec, this is impossible. While that is of course a nice surprise to me, since it is better then specified, it am curious why it works, and why Lenovo hides these great capabilities? Has anybody an explanation for this?


When I look at the Lenovo store, they recommend me the 'ThinkPad Thunderbolt 3 Workstation Dock (Gen 2)' : 40AN0230EU , just the most expensive one... . But unfortunately I own that one, and it does NOT work with Linux (while it does Win10). See there: https://forums.lenovo.com/t5/Ubuntu/Thinkpad-P1-Gen2-with-Thunderbolt-3-Workstation-Dock-external/td-p/4575709 .


There is some more information from Lenovo, but not very detailed. I downloaded this huge Excel:


from there: 



which tells in table 14 (of 56!), column 'F', rows 234 to 287, which docks should work. That includes the USB-C doc Gen 2, and some other docs, but it does not tells about the capabilities in this combination (like how many 4K monitors are possible with the X1 Extreme / P1 Gen 2 ).


So in summary, for me the 'USB-C doc Gen 2' works, and the 'Workstation Dock Gen2'does not, which is exactly the opposite of what at least some Lenovo pages say.


Is there more experiance ? Which configurations work for you, which don't ?


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Re: Which dock for Thinkpad X1 Extreme Gen 2 or Thinkpad P1 Gen 2 with multiple monitors?

2020-02-15, 12:20 PM

I would also like to add that it now seems as if Lenovo changed the compatibility list for my/our X1 Extreme Gen2...

Earlier statement said that the 40AN0170xx and 40AN0230xx were compatible with our X1 Extreme Gen2, but in later documentation Lenovo now (AFTER I've bought the 40AN0230xx !!) states the X1 Extreme Gen2 should use a 40ANY170xx or 40ANY230xx....

What is the correct info??

How can Lenovo change this afterwards?? And, what responsibility will they take in terms of replacing my dock with a correct/working one??

I post this sice, even after multiple firmware updates for both the X1 Extreme itself (1.28 now) and the 40AN0230EU dock fw per 20200214, the situation is unacceptable even in Windows 10!

The PC cannot go to sleep without having heavy problems waking up. Each and every time the screens (sometimes all three of them, sometimes two or one of them) constantly flickers or do not show a picture, or show as we call it in Sweden "the ants war" - that is, like when you look at a TV where no broadcast is received and no test image is shown, pretty much as what the little girl in the classic movie Poltergeist looks at.... I did not even know this type of pic existed in these setup...

Even when I completly shut it down and then start it up I often get pretty much the same problems.

Sometimes, while in the middle of working, the screens (three-display setup) just gets black and then I have to shutdown or at least re-initialize the screens by the Shift-CTRL-Win-B combo...

And, the sound from the dock's 3,5mm outlet constantly making an irregular popping noice, no matter how I try to upgrade the drivers for the Thunderbolt sound drivers etc. (No problem via the 3,5mm outlet on the X1E2 itself, though..)

Are all of the above problems related to hardware faults/miss-design from Lenovo, and that's why the 40ANY230xx docks started to show up as the compatible one for our X1 Extreme Gen2:s?? (I have the one X1 Extreme Gen2 called 20QV).

So, Lenovo - how will you solve these problems??


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Re:Which dock for Thinkpad X1 Extreme Gen 2 or Thinkpad P1 Gen 2 with multiple monitors?

2020-03-09, 19:50 PM

I have a similar issues, like freezing the laptop, not be able to shutdown or not always able to boot.

My setup is using closed lid X1 extreme gen 2 connected to single 5K monitor via 2x DP ports. I'm also like you bought 40AN0230EU which was recommended for Gen 2 X1 extreme, not only by the documentation but also by Lenovo Rep.

I'm having countless issues, but the firmware version of the dock that creates least issues for me (i.e. it is possible at all to use my external monitor) is 3.1.64.

Take a look at the other threads:

Did you manage to find solution or lenovo to replace your docking station?


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Re:Which dock for Thinkpad X1 Extreme Gen 2 or Thinkpad P1 Gen 2 with multiple monitors?

2020-03-09, 20:43 PM

Btw, looking in both products:


They are using identical firmware and reference to the same ReadMe file: https://download.lenovo.com/consumer/options/thinkpad_tbt3_update_v3166.txt

The difference is that the newer version uses single power brick with Y-cable (maybe that's why they are using Y letter in the name) instead of two power bricks as on the older version.

Based on the usage of the same firmware I guess you'll see no benefit of switching, performance or stability wise, except for the convenience to save space on the desk.

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