** Changed in: linux (Ubuntu Groovy)
Status: Confirmed => Fix Committed
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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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