16.04 | Acer E5 575 | Qualcomm Atheros Device 0042 rev 31 | slow ethernet + no wifi

[ngm2]

I have had the issue when i freshly installed ubuntu 16.04 when i purchased the laptop recently. And i disabled the IPV6 feature to solve the issue. But suddenly today its not working properly and the ethernet works but it is too slow and the wifi listings are available but page fails to load.

Disable IPV6

sudo tee /proc/sys/net/ipv6/conf/all/disable_ipv6 <<< "1"

also attaching the output of wireless script from sticky

Update:
Replaced the power adapter and now ethernet issue is solved. Lets see if the issue is really solved after use it with same adapter for a day or two
And wifi is still not resolved.

[jeremy31]

Try disabling power management with

sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/*

Reboot

[ngm2]

Yes executed the command but still same issue. And anything to do with ath10k load error in dmesg?

[ngm2]

I was just going through dmesg output and came across this message

cant disable ASPM, OS doesnt have ASPM controls

Did it have anything to do with the above command?

[chili555]

[main]
NetworkingEnabled=true
WirelessEnabled=false
WWANEnabled=true

Jeremy and I hope you will click the Network Manager icon and click on Enable Wi-Fi. Does it help? Does it stick?

http://images.techhive.com/images/ar...0176-large.png

[ngm2]

@chili555 yes i enabled it when i was making the above changes.
And weirdest thing is i know the culprit, its the power adaptor, when ever i connect it the ethernet becomes very slow and when not connected it functions properly.

[chili555]

i know the culprit, its the power adaptor, when ever i connect it the ethernet becomes very slow and when not connected it functions properly.

Perhaps we can get some additional information from the log. With the adapter unplugged, open a terminal and run:

tail -f /var/log/syslog

Plug in the adapter and post the lines that appear in the terminal window when you plug it in.

Get out of 'tail' with Ctrl+c.

Also, please review system settings under power and see what the settings are for battery power vs. plugged in. Anything unusual? Here are mine for comparison.

power.png

[ngm2]

Today after i saw your message i tried to log it and to my surprise there is no issue now. I dont know whats happening, will update this thread when the bug shows up again. Thank you for helping me fix this.

But wifi is still not working. I can see all the wifi listings but pages dont load even though it says its connected.

Update:
The issue started again just now and here is the log. After the last event as per the log the ethernet became slow.

Jul  4 12:17:01 xxxx-Aspire-E5-575 CRON[11683]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jul  4 12:31:37 xxxx-Aspire-E5-575 kernel: [13383.459106] perf: interrupt took too long (4102 > 3975), lowering kernel.perf_event_max_sample_rate to 48750
Jul  4 13:17:01 xxxx-Aspire-E5-575 CRON[14618]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jul  4 13:38:25 xxxx-Aspire-E5-575 kernel: [17408.896476] perf: interrupt took too long (5135 > 5127), lowering kernel.perf_event_max_sample_rate to 38750
Jul  4 14:17:01 xxxx-Aspire-E5-575 CRON[16368]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)

[chili555]

Those are both rather benign messages. Please see: https://askubuntu.com/questions/6214...-interupt-mean

Are you confirming that those are the messages you see when you plug in the adapter? For comparison, on my machine, when I plug in the power adapter, syslog reports:

Jul  4 10:44:26 T440p kernel: [91087.336929] thinkpad_acpi: EC reports that Thermal Table has changed

[ngm2]

@chili555 yes those are the only messages i got when i plugged in the adapter.