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[SOLVED] TPLINK T4U V2 - chipset RTL8812AU drops connection
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sayusi
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PostPosted: Thu Aug 16, 2018 9:12 am    Post subject: [SOLVED] TPLINK T4U V2 - chipset RTL8812AU drops connection Reply with quote

Hi All,

I bought this TP-Link T4U USB Wifi adapter because after some re-org in my flat there is no way to have cable connection between my desktop and router.

I installed the driver successfully following this tutorial. I would like to continue gentoo install by sshing from my laptop to the desktop sitting on my armchair. I experience that the desktop drops connection after a while and I have to restart the net.wlp0s20f0u9 interface to be able to connect again.

Based on the log below I think the RTL871X and the rtl8812au module conflicts and the first decides to shutdown the driver and it might shuts down the usb for a moment.

Any other idea how can I make this device working stable with gentoo?

Dmesg:

Code:

[ 1350.582935] usb usb1-port9: disabled by hub (EMI?), re-enabling...
[ 1350.582938] usb 1-9: USB disconnect, device number 11
[ 1350.583123] RTL871X: rtw_cmd_thread: DriverStopped(1) SurpriseRemoved(1) break at line 550
[ 1350.593291] RTL871X: rtw_ndev_uninit(wlp0s20f0u9)
[ 1350.617074] RTL871X: rtw_dev_unload: driver not in IPS
[ 1350.839069] usb 1-9: new high-speed USB device number 12 using xhci_hcd
[ 1350.966392] usb 1-9: New USB device found, idVendor=2357, idProduct=010d
[ 1350.966393] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1350.966394] usb 1-9: Product: 802.11n NIC
[ 1350.966395] usb 1-9: Manufacturer: Realtek
[ 1350.966395] usb 1-9: SerialNumber: 123456
[ 1351.051807] RTL871X: rtw_ndev_init(wlan0)
[ 1352.600093] rtl8812au 1-9:1.0 wlp0s20f0u9: renamed from wlan0
[ 1352.969090] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u9: link is not ready
[ 1356.940427] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1367.347415] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1378.481065] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1389.755055] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1407.139738] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1432.471443] IPv6: ADDRCONF(NETDEV_UP): wlp0s20f0u9: link is not ready
[ 1436.317575] RTL871X: rtw_set_802_11_connect(wlp0s20f0u9)  fw_state=0x00000008
[ 1436.407700] RTL871X: start auth
[ 1436.409919] RTL871X: auth success, start assoc
[ 1436.420848] RTL871X: rtw_cfg80211_indicate_connect(wlp0s20f0u9) BSS not found !!
[ 1436.420862] RTL871X: assoc success
[ 1436.421961] RTL871X: send eapol packet
[ 1436.424980] RTL871X: send eapol packet
[ 1436.425111] RTL871X: set pairwise key camid:4, addr:f4:f2:6d:9c:3d:68, kid:0, type:AES
[ 1436.425393] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s20f0u9: link becomes ready
[ 1436.426073] RTL871X: set group key camid:5, addr:f4:f2:6d:9c:3d:68, kid:1, type:TKIP

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Last edited by sayusi on Thu Aug 16, 2018 2:50 pm; edited 1 time in total
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NeddySeagoon
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PostPosted: Thu Aug 16, 2018 9:21 am    Post subject: Reply with quote

sayusi,

The entire dmesg would be useful. Please post it on a pastebin.

At face value
Code:
[ 1350.582935] usb usb1-port9: disabled by hub (EMI?), re-enabling...
says that the USB hub turned off your WiFi because of (EMI).
That's Electro-Magnetic Interference. Your WiFi is supposed to do some of that as its a transmitter.

Try another USB bus. Not usb1.

lsusb will show your USB device layout.
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sayusi
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PostPosted: Thu Aug 16, 2018 2:49 pm    Post subject: Reply with quote

Thank you very much for the suggestion to put the device into another USB slot. It works now, but there are side effects. Sometimes it drops the connection temporarily - whenever I check output of ifconfig it shows that the interface does not have IP address - but a few seconds later it works again. Ssh connection got frozen for a few secs. DMESG does not contain any error in these cases. I assume this behaviour is kind of nature of wireless connection. The bandwidth of the connection is acceptable (10-15 MByte/sec with 5GHz), under Win 10 I have the same speed.

I mark this post as solved.
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PostPosted: Thu Aug 16, 2018 3:04 pm    Post subject: Reply with quote

sayusi,

Maybe that's power saving?
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NeddySeagoon

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sayusi
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PostPosted: Thu Aug 16, 2018 3:21 pm    Post subject: Reply with quote

I assume - I'm not expert on this field, under continuous traffic - emerge output is displayed on my laptop screen - power saving should not be enabled. On the other hand, these glitches are not periodical, they rather random.
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NeddySeagoon
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PostPosted: Thu Aug 16, 2018 4:00 pm    Post subject: Reply with quote

sayusi,

Be sure there is continuous traffic.
Run ping in another terminal Window. Its not very efficient but it will prove a point. If that stops the connection dropping, its worth looking into power saving.
If the connection still drops randomly, its not power saving.
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