What is best ' dmegs..' code to use Thanks
Charles
yes
I use dmesg -w which is the same as dmesg --follow.
Disconnect the board.
Run dmesg -w; do not close it.
Press <enter> a few times to get some spacing between the current output and the output that follows.
Connect the board.
Observe the new output.
That is your problem, it should show in the dmesg output. Now the question is why it doesn't?
Can you post a clear picture of the IC on the bottom of the board.
Below was edited for clarity by me.
I wanted OP to provide certain info from dmesg, but it didn't work out and now I don't see how it's needed. The serial port is there but greyed out in the IDE, leaving me to believe your theory is valid
Googling around shows this is an old and persistent issue. 
On the underside the marking seems to be WH? and cannot read the reest.
I did try a removal of ref to BRLTTY says its done.
Ok, reboot your PC and see if it works!
[12042.804436] usb 5-1: new full-speed USB device number 2 using xhci_hcd
[12042.981245] usb 5-1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.54
[12042.981270] usb 5-1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[12042.981280] usb 5-1: Product: USB2.0-Serial
[12048.637185] usbcore: registered new interface driver usbserial_generic
[12048.637455] usbserial: USB Serial support registered for generic
[12048.776320] usbcore: registered new interface driver ch341
[12048.776496] usbserial: USB Serial support registered for ch341-uart
[12048.776624] ch341 5-1:1.0: ch341-uart converter detected
[12048.790734] usb 5-1: ch341-uart converter now attached to ttyUSB0
First time I ran. Nothing at all happened. Changed cable and Nano and got above.
Getting the scissors out for one cable.
Wow. Now uploading code ok. Now to test project. Thankyou to ledsyn and sterretje.
I will do some experiments to see if it was the cable or the Nano or both, at fault!
The Nano were from different suppliers and clones.
Thanks all
Charles Harris
I'm happy it worked out for you!
Please mark post #10 as Solution, since @sterretje provided the key to your problem.
1 Like
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.