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<p>Just out of curiosity, why did you choose to run such an old
distribution (16.04) of Ubuntu on a relatively new laptop?</p>
<p>I just happened to receive a marketing email from Lenovo this
morning (I've bought a few PCs from them in the past) that
included the Carbon X1 Gen 7 and I looked it up. It has USB 3.1
ports (2x Gen 2 Type-C with Thunderbolt and 2x Gen 1). I'd think
that you'd need the latest possible version of Ubuntu (and the
Linux kernel) to support this laptop. <br>
</p>
<p>Looking at the Ubuntu certification page for the Carbon X1, it
shows as having been tested with Ubuntu 18.04 LTS 64-bit.</p>
<p>Your symptoms (device appears, disappears, works sometimes but
not others) could be due to instability in the underlying kernel
support for the motherboard and/or USB controllers.<br>
</p>
<p>Another issue to investigate is the use of USB 3.1 ports. In the
past there have been issues with USB 3 ports causing RF
interference with devices that are connected. This mostly
manifests with wireless keyboards and mice, but it wouldn't
surprise me if it was an issue here. The common fix is to use a
USB extension cable to move the USB device away from the port.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/17/20 7:39 AM, Kheong Sann CHAN
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOR0DQoKBtDgaL-eVj2b9Qx9DbeKtU4cEE4LqOLi-Z_LpOWXgw@mail.gmail.com">
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<div dir="ltr">I had connected the cable, tried to access it from
chirpw causing it to disconnect a few times, by the time I did
dmesg. I removed out the multiple connect/disconnect lines from
dmesg output because the information was mostly duplicate.<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Feb 17, 2020 at 7:24
PM Tom Henderson <<a href="mailto:Tom@henderson4.us"
moz-do-not-send="true">Tom@henderson4.us</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Just double checking here. The log messages below show
the cable connecting, and then disconnecting. Had you
disconnected the cable again before running dmesg, or did
the cable fail?<br>
</p>
<pre cols="72">Tom Henderson</pre>
<div>On 2/16/20 11:56 PM, Kheong Sann CHAN wrote:<br>
</div>
<blockquote type="cite">
<div>The tty port is found when I plug it in:<br>
</div>
<div>$ dmesg | grep tty<br>
[ 7527.188154] usb 1-2: pl2303 converter now attached to
ttyUSB0<br>
[ 7548.490452] pl2303 ttyUSB0: pl2303 converter now <u><b>disconnected</b></u>
from ttyUSB0</div>
<div><br>
</div>
</blockquote>
</div>
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