Wifi drops after ~ 5 minutes with RTL8821AE

Question

My wifi connection doesnt work properly; it stays connected only for around 5 minutes after I turn on the PC. I'm using Ubuntu 16.04.

I've tried

sudo service network-manager restart

which makes no difference

Same with

killall nm-applet && nm-applet &

After that I tried

sudo gedit /etc/pm/config.d/config

where I insert this string

SUSPEND_MODULES = "drivername logicalchipname"

But since I don't have permission to modify that file I tried to use chmod on it, which led to A problem that was solved but left me still in the same situation.

$ lspci -knn | grep Net -A3; rfkill list
03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd.
RTL8821AE 802.11ac PCIe Wireless Network Adapter [10ec:8821]
Subsystem: XAVi Technologies Corp. RTL8821AE 802.11ac PCIe Wireless Network Adapter [1b9a:2482]
 Kernel driver in use: rtl8821ae
 Kernel modules: rtl8821ae

0: hci0: Bluetooth  Soft blocked: yes   Hard blocked: no
1: phy0: Wireless LAN   Soft blocked: no    Hard blocked: no

What do you suggest I do?

https://askubuntu.com/questions/939477/ubuntu-16-04-lts-lost-administrator-rights-bash-etc-profile-permission-denied#comment1490504_939477 — , Jul 25 '17 at 21:52
Please [edit] your question and add output of lspci -knn | grep Net -A3; rfkill list terminal command. — Pilot6, Jul 25 '17 at 22:00
Same problem as Wireless disconnect issues Ubuntu 16.04 with RTL8821ae but I don't think this question has a working answer — Zanna, Jul 26 '17 at 07:13
So do you think Is an hardware problem?? In the case i still have assiciration — Zeno Raiser, Jul 26 '17 at 07:29
Sorry rinzwind i didnt see your post, i've already tried what you said and it doesnt work — Zeno Raiser, Jul 26 '17 at 07:32
This seems a method: https://gauravssnl.wordpress.com/2017/06/18/how-to-fix-realtek-rtl8723be-wireless-network-adapter-low-wi-fi-signal-issue-on-ubuntulinux-os/ Change the "rtl8723be" for your "rtl8821ae". it also describes the same problems you list. — Rinzwind, Jul 26 '17 at 07:35
Thanks @Rinzwind finally i solved this issue!! Otherwise i've should reinstall again Ubuntu and It Will be the third time... Thanks thanks thanks — Zeno Raiser, Jul 26 '17 at 22:42

Zeno Raiser · Accepted Answer · 2017-08-04T11:01:24.520

if wifi quits working again execute the commands given again (you must do this everytime there is a kernel update)

Thanks to @Rinzwind I've found a way to solve the problem, just follow this guide:

Download rtlwifi_new from here on GitHub and extract it to Desktop (or to your desired folder).
Open Terminal and change your directory to the folder where you extracted rtlwifi_new zip file (here , Desktop/rtlwifi_new-master) by using the cd command, eg
cd Desktop/rtlwifi_new-master 
Now, run these commands in Terminal:
make clean 
make 
sudo make install  
If everything is alright, you will see the message Install rtlwifi SUCCESS. It means that rtlwifi has beeen installed successfully.
Now, run this command:
sudo modprobe rtl8723be 
Amd run this command:
echo “options rtl8723be ant_sel=2” | sudo tee /etc/modprobe.d/rtl8723be.conf

Then reboot and choose your wifi network to connect.

Yes, in the original link posted by @Rinzwind in the comments there is a list of which "rtl.." are compatible with the solution — Zeno Raiser, Aug 04 '17 at 11:18

Wifi drops after ~ 5 minutes with RTL8821AE

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