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[Bug 1904221] Re: Ask 8821C Bluetooth controller to drop old firmware

This bug was fixed in the package linux - 5.8.0-36.40+21.04.1

---------------
linux (5.8.0-36.40+21.04.1) hirsute; urgency=medium

* Packaging resync (LP: #1786013)
- update dkms package versions

[ Ubuntu: 5.8.0-36.40 ]

* debian/scripts/file-downloader does not handle positive failures correctly
(LP: #1878897)
- [Packaging] file-downloader not handling positive failures correctly

[ Ubuntu: 5.8.0-35.39 ]

* Packaging resync (LP: #1786013)
- update dkms package versions
* CVE-2021-1052 // CVE-2021-1053
- [Packaging] NVIDIA -- Add the NVIDIA 460 driver

-- Kleber Sacilotto de Souza <kleber.souza@canonical.com> Thu, 07 Jan
2021 11:57:30 +0100

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1052

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1053

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