This bug is awaiting verification that the 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-
groovy' to 'verification-done-groovy'. If the problem still exists,
change the tag 'verification-needed-groovy' to 'verification-failed-
groovy'.

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 added: verification-needed-groovy

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.6 in Ubuntu.
https://bugs.launchpad.net/bugs/1904221

Title:
  Ask 8821C Bluetooth controller to drop old firmware

Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem-5.6 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Fix Committed
Status in linux-oem-5.6 source package in Focal:
  Confirmed
Status in linux source package in Groovy:
  Fix Committed
Status in linux-oem-5.6 source package in Groovy:
  Invalid

Bug description:
  [Impact]
  Some platforms may keep USB power in S3/S4/S5, so Realtek 8821C retains
  its firmware even with a cold boot.

  [Fix]
  Use vendor command to drop firmware if the version is old.

  [Test case]
  Use dmesg to check if new firmware is loaded.
  With the patch applied, we can find new firmware is loaded.

  [Where problems could occur]
  There's a 200ms delay which can slow down when BT controller is opened
  by userspace first time.

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