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I have old Dell Optiplex 980 and use Asus RTL8812AE 802.11ac PCIe to connect to my wifi network. I would prefer wired, but live in a small studio with odd layout and running CAT cable is not really an option for me.

I installed Ubuntu 18.04 fresh. To my knowledge there is some issue with full support of wifi cards with Realtek chipset on Linux. After installation, the wifi worked straight out of box but it was slow. Upgraded wifi drivers with rtlwifi_new stack from GIT. It allowed the card to have full speed, however next time after reboot, the pages were loading slow or timing out. I reloaded the wifi module and rebooted my machine a few times which had no effect on the connection's reliability. I turn my computer next day to gather some diagnostic data and post to forum and all of sudden it is working! :confused: During this whole time it has stayed on 5GHz frequency. During the same time I tested other devices to my wifi network with no issues.

Previously I had ubuntu 16.04 and after installing rtlwifi_new stack, I had no problems except it tended to drop randomly from 5 to 2.4 GHz and I figured out how to force it to stay on 5 Ghz. Sometimes it would had dropped wifi connection for a second and re-establish connection.

If anyone knows a good source of drivers to try or what settings I should look at with configuration files please share!

If these lead to no progress, I am thinking about switching to Mint to address reliability but is it worth it since it is based on Ubuntu? In worst case, if performance deteriorates and stays unstable, I may have to go full with Windows 10 and install Ubuntu as VM since the card works consistently well under that platform.



lspci | grep Wireless
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8812AE 802.11ac PCIe Wireless Network Adapter (rev 01)

eno1 no wireless extensions.

wlp1s0 IEEE 802.11 ESSID:"skywalker"
Mode:Managed Frequency:5.745 GHz Access Point: E4:F0:42:EB:EF:5A
Bit Rate=400 Mb/s Tx-Power=30 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-38 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:389 Missed beacon:0

sudo lspci -vv -s 01:00.0
[sudo] password for tom:
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8812AE 802.11ac PCIe Wireless Network Adapter (rev 01)
Subsystem: ASUSTeK Computer Inc. RTL8812AE 802.11ac PCIe Wireless Network Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
09-18-2018, 04:30 AM
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