Ubuntu: Why is my wireless network adapter acting in a strange way? (Ubuntu 14.04)



Question:

I have a laptop with Intel Centrino Advanced-N 6235 wireless network card, and I'm on Ubuntu 14.04. For almost a week I have had a strange problem with my wireless card. When I plug in the power cable, the network card stays connected to the access point, but stops receiving altogether, but works completely normal on battery.

From the little digging around, I was narrow it down as a power management related issue. By design when I'm running the laptop on battery, the wireless card is in power management:on status, as verified by sudo iwconfig command. When I plug in the power cable, it goes into power management:off status, and stops receiving. Upon manipulating it with sudo iwconfig wlan0 power on, while still connected to the AC power, the power management is turned on, and the card starts to function normally.

The same laptop does not have this trouble when booted in Windows 7, so I don't think it is an OS independent case of faulty component. Is there a sophisticated solution to it, or do I need to rely on some shoddy script to execute sudo iwconfig wlan0 power on, every time I plug in the power cable?


Solution:1

Please open a terminal and do:

sudo cp /usr/lib/pm-utils/power.d/wireless /usr/lib/pm-utils/power.d/wireless.bak  gksudo gedit /usr/lib/pm-utils/power.d/wireless   

When the file opens, make the following changes; I refer to the line number in the file on my 14.04 system:

Line 38: iwconfig_ac="power on" instead of off  Line 41: *) iwconfig_ac="power on" instead of off  Line 75: false) wireless_powersave on ;; instead of off  

Spacing, spelling, etc. are crucial so proofread carefully. Save and close gedit. Reboot and check:

iwconfig  

If this is unclear, I have posted my amended file here for reference: http://paste.ubuntu.com/8020443/

On my 14.04 system, after reboot, power management is on for both AC and battery.


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