Vamos tentar outra versão mais recente do driver:
cd rtlwifi_new-master
sudo make uninstall
sudo modprobe -r rtl8821ae
cd ..
sudo rm -rf rtlwifi_new-master
git clone -b extended https://github.com/lwfinger/rtlwifi_new
cd rtlwifi_new
make
sudo make install
sudo modprobe rtl8821ae
Alguma melhoria?
EDITAR : Na sua análise, vemos:
Cell 03 - Address: xx
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=70/70 Signal level=-40 dBm
Encryption key:on
ESSID:"sdcwireless WiFi"
<snip>
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
<snip>
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
O ideal é que adoremos ver essas alterações:
First, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.
Além disso, gostaríamos que o SSID fosse renomeado para um sem espaço no nome, como sdcwireless_WiFi.
Normalmente, os drivers do Linux são incomodados pelo TKIP; assim, é bastante inseguro: link
TKIP itself is no longer considered secure, and was deprecated in the 2012 revision of the 802.11 standard.
Esperamos que você consiga convencer a empresa a proteger a rede.
Também vemos, no seu log de mensagens:
[ 3313.007137] _rtl_pci_interrupt: 417 callbacks suppressed
[ 3318.009871] _rtl_pci_interrupt: 1732 callbacks suppressed
[ 3323.014813] _rtl_pci_interrupt: 2015 callbacks suppressed
[ 3328.018509] _rtl_pci_interrupt: 2167 callbacks suppressed
Vamos tentar um parâmetro de driver para ver se isso ajuda:
sudo modprobe -r rtl8821ae
sudo modprobe rtl8821ae int_clear=0
Se isso ajudar, vamos torná-lo permanente.