I'm seeing this as well, I've got some work in progress towards this, but not finding the time I'd hoped. CH340 devices work "fine" with the current linux driver, but CH341, very very very flaky, if at all.
- Re: ch341.c does not work with new ch34x devices Greg KH
- Re: ch341.c does not work with new ch34x devices Liangent
- Re: Re: ch341.c does not work with new ch34x devices Karl Palsson