Re: [BUG] usb-serial-simple: device conflict with Owon VDS1022I

[Amit <lestoppe@gmail.com>]

Hi Greg,

     You've made valid points on both. Let me check with the authors of 
the software, there is an ongoing discussion on this.

regards,

Amit

On 06/06/25 17:47, Greg KH wrote:
> On Fri, Jun 06, 2025 at 05:00:29PM +0530, Amit wrote:
>> Hi,
>>
>>      PATCH 6.1 082/167 adds serial support for OWON HDS200 through the simple
>> usb serial driver (). This causes issues with Owon VDS1022. The VID and PID
>> is the same for both devices so the the Linux kernel loads the serial
>> driver, preventing the associated software from working.
> As vendors are not supposed to use the same device id for different
> devices, that's against the USB.org rules, so that's on them, not us :)
>
>>      My current work around for this is to blacklist usb_serial_simple. Given
>> that this driver change was recent and still under testing, could we find a
>> solution for this that doesn't involve such hacks at my end.
>>
>>      I  was able to root cause this issue only because the USB device and
>> software was working correctly before. A new user would just assume that the
>> device is not Linux compatible.
>>
>>      I've filed a bugzilla report here :
>> https://bugzilla.kernel.org/show_bug.cgi?id=220193
>>
>>      This is the software : https://github.com/florentbr/OWON-VDS1022
> As that's just using libusb, it can disconnect the device from the
> usb-serial driver if it needs to from the program itself.  Why not
> suggest this change to the authors of the software, OR just change it to
> use the serial connection that the kernel now presents instead of
> attempting to talk to it directly from userspace?
>
> thanks,
>
> greg k-h