Public bug reported:

No more /dev/ttyUSB? device for RS485 USB dongle after upgrading

lsusb -t #after upgrading
 /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
    |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M
        |__ Port 3: Dev 5, If 0, Class=Communications, Driver=, 12M
        |__ Port 3: Dev 5, If 1, Class=CDC Data, Driver=, 12M
        |__ Port 4: Dev 6, If 0, Class=Vendor Specific Class, Driver=, 12M
  should see something like 
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=ch341, 12M

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-1008-raspi 5.13.0-1008.9
ProcVersionSignature: Ubuntu 5.13.0-1008.9-raspi 5.13.14
Uname: Linux 5.13.0-1008-raspi aarch64
ApportVersion: 2.20.11-0ubuntu70
Architecture: arm64
CasperMD5CheckResult: unknown
Date: Tue Oct 19 07:13:27 2021
ImageMediaBuild: 20210421
SourcePackage: linux-raspi
UpgradeStatus: Upgraded to impish on 2021-10-19 (0 days ago)

** Affects: linux-raspi (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug arm64 arm64-image impish raspi-image

-- 
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Packages, which is subscribed to linux-raspi in Ubuntu.
https://bugs.launchpad.net/bugs/1947723

Title:
  /dev/ttyUSB? port lost on upgrading to 21.10

Status in linux-raspi package in Ubuntu:
  New

Bug description:
  No more /dev/ttyUSB? device for RS485 USB dongle after upgrading

  lsusb -t #after upgrading
   /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
  /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
      |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=uas, 5000M
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
      |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
          |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M
          |__ Port 3: Dev 5, If 0, Class=Communications, Driver=, 12M
          |__ Port 3: Dev 5, If 1, Class=CDC Data, Driver=, 12M
          |__ Port 4: Dev 6, If 0, Class=Vendor Specific Class, Driver=, 12M
    should see something like 
  /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
      |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
          |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=ch341, 
12M

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: linux-image-5.13.0-1008-raspi 5.13.0-1008.9
  ProcVersionSignature: Ubuntu 5.13.0-1008.9-raspi 5.13.14
  Uname: Linux 5.13.0-1008-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu70
  Architecture: arm64
  CasperMD5CheckResult: unknown
  Date: Tue Oct 19 07:13:27 2021
  ImageMediaBuild: 20210421
  SourcePackage: linux-raspi
  UpgradeStatus: Upgraded to impish on 2021-10-19 (0 days ago)

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