http://bugzilla.opensuse.org/show_bug.cgi?id=1189466 http://bugzilla.opensuse.org/show_bug.cgi?id=1189466#c2 --- Comment #2 from Hans Mayer ---

Hi Takashi

I just checked 5.3.18-lp152.54, 5.3.18-lp152.57, 5.3.18-lp152.60 and 5.3.18-lp152.63. 5.3.18-lp152.57 seems to be the last working kernel. 5.3.18-lp152.54 works 5.3.18-lp152.57 works 5.3.18-lp152.60 and 63 do not work and both show the behavior that after first plug in of the device the kernel driver is reported active

..... [ 0.004845] [000010fe] libusb: debug [libusb_open] open 1.7 [ 0.004879] [000010fe] libusb: debug [usbi_add_pollfd] add fd 9 events 4 [1629110656:9634] INFO: Device is open [ 0.004893] [000010fe] libusb: debug [libusb_kernel_driver_active] interface 0 --->>>> [1629110656:9634] INFO: Kernel Driver Active [ 0.004905] [000010fe] libusb: debug [libusb_detach_kernel_driver] interface 0 [1629110656:9651] INFO: Kernel Driver Detached! [ 0.006673] [000010fe] libusb: debug [libusb_claim_interface] interface 0 [1629110656:9652] INFO: Claimed Interface [1629110656:9652] DEBUG: ABACOM, nothing to do, USB_setup_device() [ 0.006726] [000010fe] libusb: debug [libusb_alloc_transfer] transfer 0x16e8930 [ 0.006734] [000010fe] libusb: debug [libusb_submit_transfer] transfer 0x16e8930 ......

Hope this helps

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http://bugzilla.opensuse.org/show_bug.cgi?id=1189466 http://bugzilla.opensuse.org/show_bug.cgi?id=1189466#c4 --- Comment #4 from Takashi Iwai --- Thanks, now it became easier to hunt down. Between the working and non-working kernels (*-57 and *-60), there is a backport of the upstream fix 46ee4abb10a07bd8f8ce910ee6b4ae6a947d7f63 USB: serial: ch341: add new Product ID for CH341A And this exactly matches with your device, 1a86:5512. It's a patch to add this device to ch34 serial driver. That is, on the recent kernel, your device is already bound with the serial device driver, hence the behavior changed. For restoring the old behavior, you may try blacklist ch341 module, e.g. add the following to /etc/modprobe.d/*.conf file blacklist ch341 Could you give it a try? -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1189466 http://bugzilla.opensuse.org/show_bug.cgi?id=1189466#c6 Takashi Iwai changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED Flags|needinfo?(mail@hjmayer.de) | --- Comment #6 from Takashi Iwai --- Good to hear that workaround is actually effective. I guess we don't want to change the upstream behavior, as binding to the serial device is basically good as default. You can keep the workaround for applying your specific workload. -- You are receiving this mail because: You are on the CC list for the bug.