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I recently purchased an ASUS PCE-AC51 Wireless PCI-E Adapter for my PC and didn't have any driver problems on my Windows 10 (works as expected).

If I try to use it on my Linux (Fedora 26; 4.13.5-200.fc26.x86_64; GNOME 3.24.2) I have a tremendous performance drop. My connection is never faster than 100 Kb/s and it is simply useless.

The driver from the official ASUS website is out dated and I was not able to compile/install it.

I have tried installing rtl8821ae from here and succeeded, but still performance is not improving.

Here are some more info:

$ lspci | grep -i wireless
1f:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8812AE 802.11ac PCIe Wireless Network Adapter (rev 01)

$ lspci -vv -s 1f:00.0 
1f:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8812AE 802.11ac PCIe Wireless Network Adapter (rev 01)
    Subsystem: ASUSTeK Computer Inc. Device 86dd
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort+ <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 62
    Region 0: I/O ports at d000 [size=256]
    Region 2: Memory at fd500000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: rtl8821ae
    Kernel modules: rtl8821ae

$ lspci -n -s 1f:00.0
1f:00.0 0280: 10ec:8812 (rev 01)

Does anyone know what could be the cause of the issue I am dealing with?

PS. If I connect with LAN cable it works also as expected.

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