Ubuntu on E5 573G-71L9 - wireless LAN disconnects randomly

eelcoherder

As mentioned in a different thread, I finally got Ubuntu 15.10 installed on my E5 573G-71L9. At first, the wireless LAN was not working, but I managed to find and install the presumably correct drivers.

 

What I did was: first ensure that I had the correct driver for the Realtek card: https://unixblogger.wordpress.com/2011/10/18/the-pain-of-an-realtek-rtl8111rtl8168-ethernet-card/. I blacklisted the r8169 driver.

 

As wifi still didn't work, I also figured out that it was the Atheros card that needed a proper driver. I followed this method (I basically just copied-pasted all commands without understanding them completely): http://askubuntu.com/questions/708061/qualcomm-atheros-device-168c0042-rev-30-wi-fi-driver-installation\

 

This brought my wireless connection to live, but I got disconnected frequently, about every two minutes. According to the network manager, I am still connected, but I can't even ping the DNS server (I can ping localhost). Sometimes the connection gets restored after some time, other times I need to 'disconnect' and reconnect again.

 

In addition, I purged the r8168 driver that I downloaded from Acer and installed the r8168 from the Ubuntu Software Center - no difference. I also replaced the Atheros driver with the one mentioned here (which worked for the other person facing the same problems - the driver is https://codeload.github.com/ajaybhat...nux/zip/master). For me, it did not work.

 

My regdomain is set to Germany (where I live). I tried to disable hardware encryption (nohwcrypt=0) and various other parameters for iwlwifi that were suggested in several forums and on askubuntu, which I don't really remember anymore (nothing worked, so I removed them all from the /etc/modprobe.d/ files, so they should be 'clean' again.

 

The other person (Sal) got his wifi working with just installing the Atheros driver and leaving the Realtek r8169 driver untouched. Do I need to get back to the r8169 driver (if so: how? just purging the r8168 driver did not do the trick) or does someone have a more specific suggestion?

 

Could it be that I just 'screwed up' my driver configuration and that a clean install, followed by just installing the Atheros driver could do the trick? Before I spend another couple of evenings toying around, I would be very grateful for some specific directions. Thanks again for your help!

 

eelcoherder

Does no one have a clue? I have some more information and details.

 

I just performed a clean install of Ubuntu 15.10, for a fresh start without traces from previous attempts. After that, I installed the Atheros driver that worked for the person with the same system and the same problem (https://codeload.github.com/ajaybhatia/Qualcomm-Atheros-QCA9377-Wifi-Linux/zip/master).

 

As the driver did not load properly, I installed the driver as recommended at http://askubuntu.com/questions/708061/qualcomm-atheros-device-168c0042-rev-30-wi-fi-driver-installation%5C . This did not solve anything.

 

Wired internet works without any problems.

 

This is the output of dmesg | grep ath10k

 

[   12.529816] ath10k_pci 0000:03:00.0: pci irq msi-x interrupts 8 irq_mode 0 reset_mode 0
[   12.835697] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/cal-pci-0000:03:00.0.bin failed with error -2
[   13.299474] ath10k_pci 0000:03:00.0: Direct firmware load for ath10k/QCA9377/hw1.0/board-2.bin failed with error -2
[   15.171270] ath10k_pci 0000:03:00.0: qca9377 hw1.0 (0x05020000, 0x003820ff sub 11ad:0806) fw WLAN.TF.1.0-00267-1 fwapi 5 bdapi 1 htt-ver 3.1 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1 features ignore-otp
[   15.171273] ath10k_pci 0000:03:00.0: debug 0 debugfs 0 tracing 0 dfs 0 testmode 0
[   15.228201] ath10k_pci 0000:03:00.0 wlp3s0: renamed from wlan0

With the ethernet cable disconnected, I executed the wireless-info script, as provided at Ubuntuforums. As the file is too large to copy here and attachments are not allowed, I put the output in my public Dropbox folder: https://dl.dropboxusercontent.com/u/22984057/Acer/wireless-info.txt

 

I would be grateful for any pointers in the right direction. Thanks!