rtw88 8723de WiFi speed drops when BT is connected

Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> · Thu, 20 Aug 2020 20:08:45 +0800

WiFi becomes super slow after a while, if BT is connected.
Output from `iperf3 -R`:
[ 4] 334.00-335.00 sec 112 MBytes 941 Mbits/sec
[ 4] 335.00-336.00 sec 72.5 MBytes 608 Mbits/sec
[ 4] 336.00-337.00 sec 0.00 Bytes 0.00 bits/sec
[ 4] 337.00-338.00 sec 3.36 MBytes 28.2 Mbits/sec
[ 4] 338.00-339.00 sec 2.98 MBytes 25.0 Mbits/sec

Still reproducible on latest wireless-drivers-next, top commit for rtw88 is 7b080e085943 ("rtw88: 8821c: coex: add functions and parameters").

Firmwares are also latest:
u@u:/lib/firmware/rtw88$ md5sum *8723d*
ea7a621393871e579bcca1b9539e9639 rtw8723d_fw.bin

u@u:/lib/firmware/rtl_bt$ md5sum *8723d*
6551d1f5c5a9c4ce7ab755d58576e0b0 rtl8723d_config.bin
e66f08b49eb0c8b79b175298b1be328a rtl8723d_fw.bin

Thanks!

Kai-Heng