Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Medium
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: Medium
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: Invalid
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.6 (Ubuntu Groovy)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Groovy)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => Medium
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1904221
Title:
Ask 8821C Bluetooth controller to drop old firmware
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