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Date:   Sat, 16 May 2020 20:03:48 +0200
From:   Martin Blumenstingl <>
To:     Tobias Baumann <>
Subject: Re: RTL8723BS driver doesn't work for,me but I can help testing

Hi Tobias,

On Thu, May 7, 2020 at 10:57 AM Tobias Baumann <> wrote:
> Hello Community
> I was referred to you by Martin. I have an older Android TV box that
> runs for over 3 years with Armbian Linux (Debian Jessie Headless Kernel
> 3.10.99). I'm looking forward to the new kernels and I'm glad that older
> hardware is still supported.
> Together with Oleg(balbes150) and Martin(xdarklight) I am testing the
> new kernel 5.x for ARM ( Amlogic S812 / Meson8m2 ) . Martin has written
> a patch for the SDIO controller in the last days so that also Wifi
> module and MMC are recognized. I could now successfully load the driver
> module RTLWIFI from the kernel. But unfortunately the card is only
> listed on the desktop as "not ready" or in the terminal (iwlist) as "no
> scan result". In the dmesg/lsmod RTLWIFI->RTL8723bs is loaded and the
> module is loaded with version v4.3.5.5_12290.20140916_BTCOEX20140507-4E40 .
> I would like to ask you to check the driver because even in kernel
> 3.10.99 a newer version (v4.3.16_13854.20150410_BTCOEX20150119-5844) is
> loaded and also at github are hard kernels ( version 2017 Kernel 4.9>)
> and ap17 and thirdyouth (v5.2.17.1_26955.20180307_COEX20180201-6f52).
> More recent ones can also be found - these have already been
> successfully tested with Debian 10. i hope that this may solve the
> problem with my Linux box.
> I would appreciate feedback on this request or information about
> debugging . My Linux box is also available for testing purposes
I just tried this on one of my Meson8b boards to see if it's some
problem with the MMC controller driver (meson-mx-sdio).
Here are my steps:
- (boot the board)
- ip link set up dev wlan0
- (wait until that finishes, it takes a while because it seems to load
the wifi firmware)
- iw dev wlan0 scan
- (wait a few seconds, then it shows many 2.4GHz wifi networks)
- wpa_passphrase MY_24GHz_WIFI_SSID > /tmp/wpa_supplicant_conf
- (enter the passphrase and press CTRL-D)
- wpa_supplicant -iwlan0 -c/tmp/wpa_supplicant.conf -Dnl80211 &
- (wait a couple more seconds for it to connect)
- dhcpcd wlan0
- then I ran iperf3, see the attached result
- then I ran dmesg | grep -Ei "(rtl8723bs|wlan0)", see the attached result

with these commands wifi is working "fine" for me.
my definition of fine: it connects to my AP and traffic can flow.
transfer speeds are on the low side (with 15Mbit/s and 5Mbit/s) but I
have no reference (for example from a vendor kernel) so I can't say if
that's to be expected.

I am not sure about any "desktop" tools and their behavior because I
don't use these.
can you please try the steps above and attach the output of the
"failing" commands (together with the dmesg output)?

Best regards,

View attachment "iperf3.txt" of type "text/plain" (2511 bytes)

View attachment "dmesg.txt" of type "text/plain" (992 bytes)

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