Description of problem: There are USB to serial adapter HL-340, which use module ch341. If connect it to console of any ciso devices, it doesn't work. Steps to Reproduce: 1. Insert converter and connect to console port of cisco switch Catalist 2960. 2. Run minicom and set Bps/Par/Bits : 9600 8N1 on port settings Actual results: Show nothing. Expected results: Information from device Additional info: In the network there are many descriptions of the problem.Everything start working if apply this patch: https://github.com/karlp/ch341-linux/blob/master/0001-usb-serial-ch341-Add-parity-support.patch There are discussed in linux-usb group: http://www.spinics.net/lists/linux-usb/msg105238.html But patch was not applied. Please, make me happy and Fedora better :) Thank you.
(In reply to Viacheslav Dubrovskiy from comment #0) > Description of problem: > There are USB to serial adapter HL-340, which use module ch341. If connect > it to console of any ciso devices, it doesn't work. > > Steps to Reproduce: > 1. Insert converter and connect to console port of cisco switch Catalist > 2960. > 2. Run minicom and set Bps/Par/Bits : 9600 8N1 on port settings > > Actual results: > Show nothing. > > Expected results: > Information from device > > Additional info: > In the network there are many descriptions of the problem.Everything start > working if apply this patch: > https://github.com/karlp/ch341-linux/blob/master/0001-usb-serial-ch341-Add- > parity-support.patch > > There are discussed in linux-usb group: > http://www.spinics.net/lists/linux-usb/msg105238.html > But patch was not applied. > Please, make me happy and Fedora better :) > Thank you. Upstream requested changes and the original author never followed up as far as I can tell. We can't apply this as-is. Moving this bug to rawhide as it needs to be fixed there first if we get to it.
Maybe duplicate of #1235715
This bug still exists with kernels 4.7.3.200-fc24.x86_64 and 4.7.4.200-fc24.x86_64
This has not been fixed with the Fedora 25 Beta 1 release. Kernel 4.8.0-0.rc7.git0.1.fc25.x86_64 USB-Serial Adapter driver: ch341 idVendor=1a86, idProduct=7523 The chipset is recognized, and the ch341 kernel module is loaded, but the baud rate is not set correctly, and so garbage is sent/received through the usb/serial adapter instead of valid characters (for instance with minicom).
Fixed. Thanks. See: https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=1235715