This bug is awaiting verification that the linux-riscv/6.2.0-27.28.1
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-lunar' to 'verification-done-lunar'. If the
problem still exists, change the tag 'verification-needed-lunar' to
'verification-failed-lunar'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags removed: verification-done-lunar
** Tags added: kernel-spammed-lunar-linux-riscv verification-needed-lunar

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-6.0 in Ubuntu.
https://bugs.launchpad.net/bugs/2021949

Title:
  Fix Monitor lost after replug WD19TBS to SUT port with VGA/DVI to
  type-C dongle

Status in HWE Next:
  New
Status in OEM Priority Project:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in linux-oem-6.0 package in Ubuntu:
  Invalid
Status in linux-oem-6.1 package in Ubuntu:
  Invalid
Status in linux source package in Jammy:
  New
Status in linux-oem-6.0 source package in Jammy:
  Fix Released
Status in linux-oem-6.1 source package in Jammy:
  Fix Released
Status in linux source package in Kinetic:
  Fix Committed
Status in linux-oem-6.0 source package in Kinetic:
  Invalid
Status in linux-oem-6.1 source package in Kinetic:
  Invalid
Status in linux source package in Lunar:
  Fix Released
Status in linux-oem-6.0 source package in Lunar:
  Invalid
Status in linux-oem-6.1 source package in Lunar:
  Invalid
Status in linux source package in Mantic:
  Fix Committed
Status in linux-oem-6.0 source package in Mantic:
  Invalid
Status in linux-oem-6.1 source package in Mantic:
  Invalid

Bug description:
  [Impact]
  Enabling CL1 (Controller Low Power) states during discovery of existing 
tunnels established by the system firmware can interfere with the operation of 
those tunnels.
  The DisplayPort tunnel establishment timeout of 1.5 seconds can be 
insufficient for some docking stations, leading to blank displays.

  [Fix]
  CL1 states are now not enabled during discovery of existing tunnels. The TMU 
settings also remain unchanged.
  The timeout is increased to 3 seconds to allow more time for the DisplayPort 
connection manager handshake, fixing the issue of displays remaining blank.

  [Test Cases]
  1. plug docking station on the host
  2. bring up the host and get into desktop.
  3. flip docking station's cable.
  4. check if the external monitor works well

  [Where problems could occur]
  Low, If the handshake actually requires even more than 3 seconds in some 
cases, the timeout may still need to be increased further.

  [Misc]
  Jammy needs more patches to enable the thunderbolt CLx and the SRU will be a 
huge,  
  so skip Jammy.

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