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I'm having a wifi issue on my laptop that I have no idea how to solve.

My laptop runs in dual-boot Windows 8.1/Ubuntu 14.04: whenever I'm using windows, all the connections run with no problem; on ubuntu, instead, wifi connections work for a couple minutes after start-up, and then they stop working until I reboot. Wired connections work fine.

I found this question, probably relevant to my case. Refering to this answer I saw that in my case Power Management:on, so I tried running sudo iwconfig wlan0 power off, but I get this error

Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.

Probably useful infos:

##### lspci #############################
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Lenovo Device [17aa:b736]
Kernel driver in use: rtl8723be

##### iwconfig ##########################
wlan0     IEEE 802.11bgn  ESSID:off/any  
      Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
      Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
      Power Management:on

Thanks in advance for help!

EDIT: It seems Power Management is not the cause of the problem, as turning it off didn't solve it.

Community
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Matteo V
  • 103

2 Answers2

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I suspect that power management is not manipulable by iwconfig because the driver has available several parameters related to power saving; from modinfo:

parm:           swlps:bool
parm:           swenc:using hardware crypto (default 0 [hardware])
 (bool)
parm:           ips:using no link power save (default 1 is open)
 (bool)
parm:           fwlps:using linked fw control power save (default 1 is open)
 (bool)

I suggest you try this; from a terminal:

sudo -i
echo "options rtl8723be fwlps=0 swlps=0"  >  /etc/modprobe.d/rtl8723be.conf
exit

Reboot and test.

chili555
  • 60,188
  • This command managed to turn the Power Management off, but unfortunately it seems like the problem is still there. – Matteo V Apr 14 '15 at 17:19
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It seems I found a solution to the problem, using

echo "options rtl8723be fwlps=0 swlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf

More on this on this forum post. Wifi has been working for a couple hours now with no problems.

Matteo V
  • 103
  • How is this different from the answer by @chili555? – user68186 Apr 20 '15 at 14:24
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    You're correct, they're the same, my bad. Funny thing is, when I first tried this command after chili555's comment it didn't work. I would actually be curious to know why did it work the second time. – Matteo V Apr 20 '15 at 16:08
  • I have no idea why it didn't work the first time. I am glad that you figured it out and solved the problem. – user68186 Apr 20 '15 at 17:08