** Description changed:

- This morning I upgraded to Ubuntu 21.04.
+ This morning I upgraded to Kubuntu 21.04.
  
  I use two external monitors connected to my Dell XPS laptop via a Dell
  WD19 dock.
  
  Post-upgrade the monitors and also network functionality through the
  dock appear to have completely stopped functioning.
  
  When the dock is plugged in and the computer is booted the monitors do not 
enable.
  When the dock is not plugged in the computer boots normally.
  
  When I look at the dmesg output there appears to be some notable errors
  when I plug the dock in:
  
  [  516.173451] xhci_hcd 0000:39:00.0: xHCI host controller not responding, 
assume dead
  [  516.207480] xhci_hcd 0000:39:00.0: HC died; cleaning up
  [  521.313422] pcieport 0000:02:00.0: can't change power state from D3cold to 
D0 (config space inaccessible)
  [  555.140320] xhci_hcd 0000:39:00.0: xHCI host controller not responding, 
assume dead
  [  555.140343] xhci_hcd 0000:39:00.0: HC died; cleaning up
  [  560.291086] pcieport 0000:02:00.0: can't change power state from D3cold to 
D0 (config space inaccessible)
  [  850.385934] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  850.499763] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  851.717630] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  851.815190] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  856.231021] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  856.301269] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  856.320487] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  856.343208] i915 0000:00:02.0: [drm] *ERROR* CPU pipe B FIFO underrun
  [  856.382831] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  860.704920] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  860.765138] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  860.894454] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  860.965337] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  861.115198] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  861.182111] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  866.232326] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  866.351715] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  866.454536] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 
00000000eaa106e4 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
  [  866.473097] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  [  866.534697] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
  
  With the dock plugged in:
  
  * neither monitor displays although they are present under display 
configuration
  * since my laptop screen is not usually on if both monitors are present on 
the dock the immediate result was no display at all under the dock was detached
  * network connectivity is not established although the network device appears 
under networks
  
  Unfortunately I lack the skills to diagnose this further without
  assistance or to install a more recent kernel to see if it is resolved
  there.
  
  It appears that communications between the laptop and the Dock are not
  going well to my eyes (is this what link training is on Thunderbolt)
  
  I'm happy to provide further information... although in a few days the
  lack of Dock and monitors will be a bit of an issue and I may have to
  roll something back.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: linux-image-5.11.0-16-generic 5.11.0-16.17
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  Uname: Linux 5.11.0-16-generic x86_64
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC2:  mulhollandd   1940 F.... pulseaudio
-  /dev/snd/controlC1:  mulhollandd   1940 F.... pulseaudio
-  /dev/snd/controlC0:  mulhollandd   1940 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC2:  mulhollandd   1940 F.... pulseaudio
+  /dev/snd/controlC1:  mulhollandd   1940 F.... pulseaudio
+  /dev/snd/controlC0:  mulhollandd   1940 F.... pulseaudio
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Sat May  1 08:57:26 2021
  InstallationDate: Installed on 2020-06-13 (321 days ago)
  InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Dell Inc. XPS 13 9360
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-16-generic 
root=/dev/mapper/vgkubuntu-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-5.11.0-16-generic N/A
-  linux-backports-modules-5.11.0-16-generic  N/A
-  linux-firmware                             1.197
+  linux-restricted-modules-5.11.0-16-generic N/A
+  linux-backports-modules-5.11.0-16-generic  N/A
+  linux-firmware                             1.197
  SourcePackage: linux
  UpgradeStatus: Upgraded to hirsute on 2021-04-30 (0 days ago)
  dmi.bios.date: 03/09/2021
  dmi.bios.release: 2.15
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.15.1
  dmi.board.name: 0115N5
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.15.1:bd03/09/2021:br2.15:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0115N5:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9360
  dmi.product.sku: 075B
  dmi.sys.vendor: Dell Inc.

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https://bugs.launchpad.net/bugs/1926809

Title:
  WD19 dock stops working in Ubuntu 21.04

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