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[Bug 1572698] CurrentDmesg.txt
** Attachment added: "CurrentDmesg.txt"
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Slow speed and dropped connections with Realtek RTL8192CU-based wifi
Status in linux package in Ubuntu:
I am using a D-Link DWA-131 USB wlan adapter to connect to my private wlan.
The adapter works fine under Windows and I have no problems connecting to my wlan with other devices (e.g. my laptop running Linux Mint).
However, the adapter, which is based on the Realtek rtl8192cu chipset, won't work correctly on any current Ubuntu machine (in my case Kubuntu 15.10 64bit):
As also showcased by a myriad of other bug reports (most of which have expired by now), wlan-adapters based on the Realtek rtl8192cu chipset exhibit very slow connection speeds and frequently dropped connections with current Linux kernels.
I have noticed this originally in Linux Mint 17 running kernel 3.19.x, in Kubuntu 15.10 up to 18.104.22.168 and can confirm that it is still present in a live session of Xenial Xerus (16.04).
I have tried commonly mentioned "fixes" such as deactivating hardware encryption without success.
The drivers available on the Realtek homepage are apparently intended
for older kernels and won't install.
There is, however, a fixed driver available via github (https://github.com/pvaret/rtl8192cu-fixes).
I have followed the instructions found there and finally my wlan-adapter is working correctly.
Apparently the issues caused by the broken driver in the linux kernels might be connected to power management.
I am posting this bug here in the hope that some developer finally manages to incorporate the (obviously available) fixes found in the github-drivers into the drivers already included in the kernel.
USER PID ACCESS COMMAND
/dev/snd/controlC0: patrick 2300 F.... pulseaudio
/dev/snd/controlC1: patrick 2300 F.... pulseaudio
DistroRelease: Ubuntu 15.10
InstallationDate: Installed on 2015-10-22 (181 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Gigabyte Technology Co., Ltd. GA-870A-UD3
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-35-generic root=UUID=1016b861-fa27-4990-bac9-58a3ab27ff5b ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
No PulseAudio daemon running, or not running as session daemon.
UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
Uname: Linux 4.2.0-35-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.vendor: Award Software International, Inc.
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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