For all my users with the rtl8723be chipset, I have had to use the ant_sel parameter to make it work. As of the 4.12 kernel this no longer works, there are no access points visible. I have to keep them on the 4.11 kernel or they can't use wifi.
In case it matters, I'm using ant_sel=1 and I can't verify if a laptop that needs ant_sel=2 would still work.
Larry Finger has found the bugs and created patches. Would it be possible to get these added until they make it upstream? https://github.com/lwfinger/rtlwifi_new/issues/259#issuecomment-327005167
After an update of 4.12 a few weeks ago, the problem was solved. Since the last update from yesterday, kernel 4.13, the problem came again. I do not have time to investigate for now.
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