Public bug reported:
I plug in this device:
067b:2303 Prolific Technology, Inc. PL2303 Serial Port / Mobile Phone
Data Cable
Output from kern.log is:
2026-03-11T10:52:42.261970+00:00 chopper kernel: usb 3-3.4: new full-speed USB
device number 20 using xhci_hcd
2026-03-11T10:52:42.335994+00:00 chopper kernel: usb 3-3.4: New USB device
found, idVendor=067b, idProduct=2303, bcdDevice= 3.00
2026-03-11T10:52:42.336044+00:00 chopper kernel: usb 3-3.4: New USB device
strings: Mfr=1, Product=2, SerialNumber=0
2026-03-11T10:52:42.336049+00:00 chopper kernel: usb 3-3.4: Product: USB-Serial
Controller
2026-03-11T10:52:42.336051+00:00 chopper kernel: usb 3-3.4: Manufacturer:
Prolific Technology Inc.
2026-03-11T10:52:42.344878+00:00 chopper kernel: pl2303 3-3.4:1.0: pl2303
converter detected
2026-03-11T10:52:42.346956+00:00 chopper kernel: usb 3-3.4: pl2303 converter
now attached to ttyUSB0
2026-03-11T10:52:42.447837+00:00 chopper kernel: ppdev1: no associated port!
Text from remote device appears as garbage in minicom or other serial
communication program, e.g.,
)B)�(�xB)CxB)C(J)C)B)�(�)B)�(�)C8B)C
This all worked fine on Questing (kernel 6.18) and still works on other
machines
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-6.19.0-9-generic 6.19.0-9.9
ProcVersionSignature: Ubuntu 6.19.0-9.9-generic 6.19.5
Uname: Linux 6.19.0-9-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jaspert 5256 F.... pipewire
jaspert 5273 F.... wireplumber
/dev/snd/seq: jaspert 5256 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 11 10:57:30 2026
InstallationDate: Installed on 2022-08-11 (1308 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 930QED
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.19.0-9-generic
root=UUID=2937ab94-dfa7-410e-9a6d-364c229c68b6 ro quiet splash
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-03-10 (1 days ago)
dmi.bios.date: 12/04/2024
dmi.bios.release: 5.25
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: P12VAB.690.241204.MP
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP930QED-KB4UK
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SGLB192A1W-C01-G002-S0002+10.0.22000
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrP12VAB.690.241204.MP:bd12/04/2024:br5.25:svnSAMSUNGELECTRONICSCO.,LTD.:pn930QED:pvrP12VAB:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP930QED-KB4UK:rvrSGLB192A1W-C01-G002-S0002+10.0.22000:cvnSAMSUNGELECTRONICSCO.,LTD.:ct31:cvrN/A:skuSCAI-ICPS-A5A5-ADLP-PVAB:
dmi.product.family: Galaxy Book2 Pro 360
dmi.product.name: 930QED
dmi.product.sku: SCAI-ICPS-A5A5-ADLP-PVAB
dmi.product.version: P12VAB
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2143897
Title:
usb serial convertor not working
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