PL2303GL chips not recognised by 21.10 beta

[Adrian Knagg-Baugh]

L2303GL usb to serial chips are not recognised by the pl2303 module in 5.13.0-16-generic #16-Ubuntu SMP Fri Sep 3 14:53:27 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux (the current 21.10 candidate kernel). These chips are fairly common so it will cause a problem for users.

I reported this to the upstream maintainer and he confirmed it is a known issue and fixed by commit dcf097e7d21f ("USB: serial: pl2303: fix GL type detection"). Please backport for 21.10.

Email correspondence confirming bug pasted below.

Johan Hovold <email address hidden>

9:33 AM (1 hour ago)

to me, linux-usb
On Tue, Oct 05, 2021 at 05:28:24PM +0100, Adrian Knagg-Baugh wrote:
> Hi,
> As requested in dmesg I'm reporting an unknown device type for the
> pl2303 driver. Here's the extract from dmesg:
>
> [ 2824.450073] usb 1-2: new full-speed USB device number 5 using xhci_hcd
> [ 2824.621910] usb 1-2: New USB device found, idVendor=067b,
> idProduct=23d3, bcdDevice= 4.05
> [ 2824.621922] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [ 2824.621926] usb 1-2: Product: USB-Serial Controller
> [ 2824.621928] usb 1-2: Manufacturer: Prolific Technology Inc.
> [ 2824.621931] usb 1-2: SerialNumber: EKCRb19B616
> [ 2824.630068] pl2303 1-2:1.0: pl2303 converter detected
> [ 2824.630084] pl2303 1-2:1.0: unknown device type, please report to
> <email address hidden>
>
> adrian@mononoke:~$ uname -a
> Linux mononoke 5.13.0-16-generic #16-Ubuntu SMP Fri Sep 3 14:53:27 UTC
> 2021 x86_64 x86_64 x86_64 GNU/Linux
>
> The pl2303 is in a Skywatcher telescope synscan handset, the behaviour
> is a regression since it was working fine in the 5.11 kernels packaged
> with Ubuntu 21.04, it's only since updating to 5.13 (which I've had to
> do to resolve issues with the graphics card in my new laptop) that
> I've seen the problem.
>
> See below for the output of sudo lsusb -v
>
> I hope this helps.

Thanks for the report. This should already have been fixed by commit
dcf097e7d21f ("USB: serial: pl2303: fix GL type detection") which was
backported to v5.13.15 (released about a month ago).

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-16-generic 5.13.0-16.16
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: adrian 1773 F.... pulseaudio
 /dev/snd/controlC0: adrian 1773 F.... pulseaudio
 /dev/snd/controlC1: adrian 1773 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 6 10:55:35 2021
InstallationDate: Installed on 2021-10-02 (3 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Beta amd64 (20210922)
MachineType: ASUSTeK COMPUTER INC. ROG Strix G513IH_G513IH
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-16-generic root=UUID=8a2303d3-7aba-4e56-9501-3d719f7e2f1f ro quiet splash vt.handoff=7
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-16-generic N/A
 linux-backports-modules-5.13.0-16-generic N/A
 linux-firmware 1.201
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/16/2021
dmi.bios.release: 5.16
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: G513IH.310
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: G513IH
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.ec.firmware.release: 0.68
dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrG513IH.310:bd07/16/2021:br5.16:efr0.68:svnASUSTeKCOMPUTERINC.:pnROGStrixG513IH_G513IH:pvr1.0:sku:rvnASUSTeKCOMPUTERINC.:rnG513IH:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: ROG Strix
dmi.product.name: ROG Strix G513IH_G513IH
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Po-Hsu Lin (cypressyew)]

Hello!
Thanks for your report, this patch has been applied to Impish kernel master-next branch via stable update process, it should be available in -updates soon.