Bug 201921

Summary:	Bluetooth: hci0: RTL: rtl: unknown IC info, lmp subver a99e, hci rev 826c, hci ver 0008
Product:	Drivers	Reporter:	Cristian Aravena Romero (caravena)
Component:	Bluetooth	Assignee:	linux-bluetooth (linux-bluetooth)
Status:	NEW ---
Severity:	normal	CC:	kai.heng.feng, vasthusya
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	Ubuntu 4.19.0-8.9-generic 4.19.6	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg 4.20.0-042000rc7-generic Add IC_INFO(a99e, 826c) to load rtl8821c firmware Kernel messages from various boot states. 0001-Bluetooth-btrtl-Let-rtl_load_file-always-return-erro.patch 0002-Bluetooth-btrtl-Let-btrtl_initialize-always-return-e.patch 0003-Bluetooth-btrtl-Skip-initialization-if-firmware-is-a.patch 0004-Bluetooth-btrtl-Expose-btrtl_device_info.patch

Description Cristian Aravena Romero 2018-12-07 11:43:32 UTC

Hello,

Open bug in launchpad.net
https://bugs.launchpad.net/bugs/1807375

dmesg:
Bluetooth: hci0: RTL: rtl: unknown IC info, lmp subver a99e, hci rev 826c, hci ver 0008

Best regards,
--
Cristian Aravena Romero (caravena)

Comment 1 Cristian Aravena Romero 2018-12-19 19:35:39 UTC

Created attachment 280099 [details]
dmesg 4.20.0-042000rc7-generic

I really do not know if the problem was definitively solved. Because Bluetooth devices now appear in GNOME.

Comment 2 vasthusya 2019-01-09 08:09:39 UTC

(In reply to Cristian Aravena Romero from comment #1)
> Created attachment 280099 [details]
> dmesg 4.20.0-042000rc7-generic
> 
> I really do not know if the problem was definitively solved. Because
> Bluetooth devices now appear in GNOME.

It is still affecting me on vanilla 4.20 and 4.19.12.

I was able to modify drivers/bluetooth/btrtl.c to use rtl_bt/rtl8821c_fw.bin firmware for this device.

Comment 3 vasthusya 2019-01-13 09:49:13 UTC

Created attachment 280449 [details]
Add IC_INFO(a99e, 826c) to load rtl8821c firmware

With this patch, it has been working fine for a week using Bluetooth mouse.

Other things tested:

 - File transfer
 - A2DP Source

Comment 4 Kai-Heng Feng 2019-01-13 17:03:29 UTC

vasthusya,

I also see this issue, but this only happens to reboot.

Do you see this on cold boot?

Comment 5 vasthusya 2019-01-14 07:30:33 UTC

Created attachment 280459 [details]
Kernel messages from various boot states.

Yes, the coldboot lmp_subver=8221 & hci_rev=c are correct and Bluetooth works on vanilla kernel.

Unfortunately, I must restart the computer in order to gain CPU clock boost on my Ryzen 5 2500u.
Separate issue, haven't checked around here for that bug yet.
https://community.amd.com/thread/229980#2893988

Comment 6 Kai-Heng Feng 2019-01-24 14:21:13 UTC

Created attachment 280713 [details]
0001-Bluetooth-btrtl-Let-rtl_load_file-always-return-erro.patch

Comment 7 Kai-Heng Feng 2019-01-24 14:22:00 UTC

Created attachment 280715 [details]
0002-Bluetooth-btrtl-Let-btrtl_initialize-always-return-e.patch

Comment 8 Kai-Heng Feng 2019-01-24 14:22:25 UTC

Created attachment 280717 [details]
0003-Bluetooth-btrtl-Skip-initialization-if-firmware-is-a.patch

Comment 9 Kai-Heng Feng 2019-01-24 14:23:17 UTC

Please try these patches. It should the issue.

Comment 10 vasthusya 2019-01-26 03:07:43 UTC

Created attachment 280781 [details]
0004-Bluetooth-btrtl-Expose-btrtl_device_info.patch

Hi Kai,

Your patch #2 had two issues:
 - btrtl_device_info definition is unavailable in hci_h5.c as it's not in header
 - a couple of argument type mismatch

It would have compiled fine when you don't have CONFIG_BT_HCIUART_RTL=y

I have made it compilable and running it now with working Bluetooth.

Thanks

Comment 11 Kai-Heng Feng 2019-01-27 08:35:16 UTC

Turns out it's a regression, I sent V2 patch to address the issue.

https://lkml.org/lkml/2019/1/27/16

Comment 12 vasthusya 2019-08-08 09:21:57 UTC

The patch has been working for me since kernel 5.1.

Thank you.