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

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

Ansh Gupta <anshgupta1941@outlook.com> wrote:
> Hello,
> 
> 
> > If you play a local music without WiFi connection, does it work well?
> 
> Works a lot better, no disconnections even after going to idle mode.
> There is still a delay in providing audio output, but the delay has
> reduced to 1 to 2 seconds, after which I can hear.
> 
> 
> > If only WiFi connection (without Bluetooth), does connection drop?
> No.
> 
> 
> > Bluetooth operates on 2.4GHz band, so is it possible to connect AP on
> > 5 GHz band?
> 
> The 5GHz band SSID does not show up in the available network list until
> I am 1 to 2 feet away from AP. This happens regardless of whether
> bluetooth is on or off. When connected, I can use that network at normal
> speeds even if I am about 3 meters away from AP with a wall in
> between. I have a separate SSID setup for both the 2.4 and 5GHz bands. I
> did cross check with other devices, and they could connect to the 5GHz
> SSID from a 3 meter distance.
> 
> Please note that I do not have access to this particular AP anymore than
> 9 days, so I would not be able to provide information regarding it after
> that. The issue with bluetooth and 2.4GHz band is not unique to this AP.
> I tried this with my phone hotspot using 5GHz band, but the results are
> same for every device - it would connect only within a 1 foot radius.

This is very weird. Actually, STA can find AP passively by listening beacons.
Is it possible take your phone with hotspot on 5GHz at a clear place?

> 
> Besides, bluetooth works fine on 5GHz band, although delay in audio
> output by 1 to 2 seconds is present.
> 
> > Turn off power saveing entirely by
> >    sudo iw wlan0 set power_save off
> >
> > to see if ease symptom.
> No improvements noticed in bluetooth and 5GHz wifi detection.
> 
> 
> Additional details I thought would be useful:
> 
> 
> I have a wireless usb mouse attached to my laptop,
> 
> $ lsusb -d 3938:1031
> 
> Bus 003 Device 003: ID 3938:1031 MOSART Semi. 2.4G Wireless Mouse
> 
> However, disconnecting the mouse did not make a noticeable difference.
> 
> 
> Occasionally, the earphones disconnect when audio profiles are switched,
> from A2DP to HSP/HFP and vice versa.
> 
> This only occurred with the 2.4GHz band and not the 5GHz band. Software
> which records voice does this profile switching.

To diagnose BT disconnection problem, please capture log by:
   
   while [ 1 ]; do echo ""; date -R; cat /sys/kernel/debug/ieee80211/phy0/rtw89/btc_info ; sleep 2; done | tee xxxxx.log

As I add 'date' in log, please manually record the time BT gets disconnect
or abnormal.

Also, reproduce symptoms at least three times. (more is better)


Summarize what we need:
1. btc_info log (mentioned above)
2. kernel and syslog log (with date to align btc_info log)
3. repeat experiments at least three times, and record/share the
   disconnection/abnormal time/symptom to us.