RE: rtw89: RTL8852BE Frequent Bluetooth disconnections and occasional Wi-Fi dropouts

[Ping-Ke Shih <pkshih@realtek.com>]

Ansh Gupta <anshgupta1941@outlook.com> wrote:
> Hello,
> 
> 
> My Bluetooth earphones frequently disconnect when no media is playing.
> Here is the scenario to make it clearer:
> 
> 1. I connect to my Bluetooth earphones.
> 
> 2. I start streaming a video.
> 
> 3. When the video ends, I choose another one to stream.
> 
> 4. As soon as the new video starts playing, Bluetooth disconnects.
> 

If you play a local music without WiFi connection, does it work well?

> 
> A few related things also happen, such as:
> 
> 1. Delay in providing audio output from earphones when a video loads,
> 
> 2. Slow network (with bluetooth on), due to which I could not stream
> videos without buffering every 10-20 seconds,
> 
> 3. Occasional Wi-Fi and bluetooth dropouts at the same time.

If only WiFi connection (without Bluetooth), does connection drop?

> 
> The available network connection point(s) uses 2.4GHz band. I have
> concluded that the earphones are not problematic after testing them on a
> Windows installation on the same device and on my phone.

Bluetooth operates on 2.4GHz band, so is it possible to connect AP on
5 GHz band?

> 
> 
> I disabled power saving features as mentioned with the driver options in
> /etc/modprobe.d/rtw89.conf, which did not fix the issue. I went ahead to
> toggle disable_clkreq as well to see if it does something, it did not
> fix the problem either. I toggled disable_clkreq to N right after checking.
> 
> $ cat /etc/modprobe.d/rtw89.conf
> options rtw89_pci disable_clkreq=n disable_aspm_l1=y disable_aspm_l1ss=y
> options rtw89_core disable_ps_mode=y

Turn off power saveing entirely by
  sudo iw wlan0 set power_save off 

to see if ease symptom.


All experiments above are to clarify cause 

> [    4.364330] rtw89_8852be 0000:02:00.0: Firmware version 0.29.29.8
> [    5.037633] Bluetooth: hci0: RTL: fw version 0x098b154b

I have confirmed these are already the latest firmware of WiFi and BT.