From: Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: "C. SB" <fenugrec-f9SIN1PjVWVBDgjK7y7TUQ@public.gmane.org>
Cc: linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: CH340/341: cannot open twice
Date: Sat, 19 Sep 2015 15:10:32 -0700 [thread overview]
Message-ID: <20150919221032.GF2360@localhost> (raw)
In-Reply-To: <trinity-deaddc67-9f42-4260-9032-d3eb30b7e8f1-1442696993994@3capp-mailcom-lxa06>
On Sat, Sep 19, 2015 at 11:09:54PM +0200, C. SB wrote:
> Hi,
> I'm having a strange issue with a CH340 usb-serial IC : I can only
> use/open it once. Here's what I try:
> The only solution is to unplug+replug the IC; any code using open()
> will fail with the same error.
>
> lsusb output:
> Bus 002 Device 002: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
>
> I tried only on kernels 4.0.6 and 4.1.6, system is archlinux x86-64.
>
> Am I alone having this problem ?
I'm afraid not. There has been a couple of reports of problem with this
device. The reported problems have looked like hardware issues, but it
now seems like support for these devices is simply lacking in the
driver.
Could you try the vendor driver and see if that makes the device work so
that we'd know for sure?
Thanks,
Johan
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next parent reply other threads:[~2015-09-19 22:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <trinity-deaddc67-9f42-4260-9032-d3eb30b7e8f1-1442696993994@3capp-mailcom-lxa06>
2015-09-19 22:10 ` Johan Hovold [this message]
[not found] ` <trinity-efc5f19e-b3a1-4cc7-b944-04deb6368aca-1442710334176@3capp-mailcom-lxa02>
2015-09-20 20:56 ` CH340/341: cannot open twice Johan Hovold
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