Arch Linux

Chuck Arch Linux

Member

Registered: 2011-06-23

Posts: 81

[SOLVED] Lenovo Ideapad Z710 slow wireless unless boot from ac

First of all, I really appreciate Arch Linux on my new Ideapad Z710, overall everything work pretty well without to much pain to setup.

However, it take me a lot of configurations tries and power management testing before finding that if I do not boot from AC,
my wireless performance are very poor.

Indead, if you boot from AC, wireless work at 100% and if not, I got a max download rate of 250k.

If you booted from AC, it does'nt matter if you are plugged or not, you will always get full wireless speed.

My question is, does anyone know how to have full wireless speed whitout booting from AC?.

I found that some Dell have the same problems, but I can't find a real solution.

Thanks,

Last edited by Chuck Arch Linux (2014-12-23 00:15:47)

Kopkins

Member

Registered: 2012-07-01

Posts: 189

Re: [SOLVED] Lenovo Ideapad Z710 slow wireless unless boot from ac

Check out the wireless configuration wiki page and check some of the troubleshooting tips. Your udev is probably setting the powersave for your wifi card, but not acpi isn't changing it when it goes to AC. Try disabling powersave for you wifi card. `sudo iw dev <your_interface> set power_save off`

Chuck Arch Linux

Member

Registered: 2011-06-23

Posts: 81

Re: [SOLVED] Lenovo Ideapad Z710 slow wireless unless boot from ac

I have a udev rule that look like this

ACTION=="add", SUBSYSTEM=="net", KERNEL=="wlan*", RUN+="/usr/bin/iw dev %k set power_save on"

and setting this to on or off don't change anything.
I follow the power saving wiki and I used powertop to figure what rules I have to apply.

Is there setting somewhere other than Udev that control my wireless card?

Chuck Arch Linux

Member

Registered: 2011-06-23

Posts: 81

Re: [SOLVED] Lenovo Ideapad Z710 slow wireless unless boot from ac

Looks like adding the line in /etc/modprobe.d/iwlwifi.conf

options iwlwifi 11n_disable=8

work for me, AC plugged or not.

I got full speed now.