Public bug reported:
Looks like 5.13.0 kernel broke something in the USB-serial PL2303 driver
module. I have a Sky-Watcher EQ6-R Pro telescope mount with a PL23D3
USB-serial chip (I think). My MSECORE mini PC running Ubuntu 20.04.3
has been working with this mount for the last couple of years with the
5.11 kernel. Now with the 5.13 kernel, the pl2303 module doesn't
recognize the USB-serial device. I revert back to the 5.11 kernel and
it works fine again. Here's the snippets from dmesg:
5.13.0-28-generic kernel:
[ 2.894277] usbcore: registered new interface driver usbserial_generic
[ 2.894292] usbserial: USB Serial support registered for generic
[ 2.907539] usbcore: registered new interface driver pl2303
[ 2.907574] usbserial: USB Serial support registered for pl2303
[ 2.907596] pl2303 1-6:1.0: pl2303 converter detected
[ 2.907602] pl2303 1-6:1.0: unknown device type, please report to
linux-...@vger.kernel.org
5.11.0-27-generic kernel
[ 3.201216] usbcore: registered new interface driver pl2303
[ 3.201228] usbserial: USB Serial support registered for pl2303
[ 3.201243] pl2303 1-5:1.0: pl2303 converter detected
[ 3.201349] usb 1-5: pl2303 converter now attached to ttyUSB1
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: 5.13.0 eq6-r pl2303 pl23d3
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https://bugs.launchpad.net/bugs/1960579
Title:
PL2303 Driver Bug in 5.13 Kernel
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