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Old 11-25-2014, 10:24 AM   #1
Registered: Nov 2001
Posts: 180

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rtl8723as driver - loads successfully but no wlan0 or similar device is created


I wanted to update that I seem to have gotten it working!

I investigated inside the "virtual folder" of the SDIO device and found the device ID and replaced the one for "CONFIG_RTL8723B" in sdio_intf.c. The first address (0x024c) is the vendor ID which should remain the same. The second address (0xB723) is the device ID which should be changed to (for my hardware) 0x0523. I then recompiled and ran insmod and it works. I knew it worked because there was a slight delay when loading the module.

I am using kernel 3.16.2 from the Ubuntu mainline kernel ppa and the second commit from the repository referenced which matches up with the version used in the thread referenced.


I have a device with an rtl8723bs SDIO wireless card. The rtl8723as driver should support it as seen here:, and on this source code page it seems to show support for all SDIO wireless adapters: .

I see the same lines in dmesg when the driver is loaded as the person on the ubuntuforums:
[   46.589898] 8723bs: module verification failed: signature and/or  required key missing - tainting kernel
[   46.604071] RTL871X: module init start version:v4.1.3_8883.20130902_v2
[   46.964685] RTL871X: module init ret=0
Unfortunately for me, the wlan0 device or similar is not created. I have compiled under the shipped Ubuntu 14.10 kernel and the 3.16.2 kernel referenced in the ubuntuforums thread. I do see the device under /sys/bus/sdio/devices like referenced in the ubuntuforums thread. In the past when I have had this happen it was the result of a conflict between wireless drivers. I am unsure how to directly troubleshoot that.

1. Could this be a wireless driver conflict?
2. Could I have a different hardware ID causing problems even though the source code seems set to accept all devices?
3. What troubleshooting steps can I take from here?

Last edited by Jason_25; 11-25-2014 at 11:56 AM.


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