Low signal Wifi

[koala236]

Hello.

I've installed linux mint 17.1 and i have some issues with wifi signal. Even with the router side by side with the notebook i cant get more than 30% signal.

I researched for a while and found nothing about my wireless card with this same problem. I found some similar issues but the solutions did not seem to fit in my problem (or i did not know how to interpret, since this is my first time with linux).

Also, i didnt install anything since i got it. I just formated the notebook and installed firefox, etc...
When i go to the Driver Manager, it shows nothing. Only "No proprietary drivers are in use".

My wireless card is:
Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller (rev 10)

[JeremyB]

Please post

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lsusb; lspci -nnk | grep -iA2 neet

Some Realtek cards aren't supported very well in the kernel but there are alternatives

[koala236]

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lsusb; lspci -nnk | grep -iA2 net
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 13d3:3249 IMC Networks Internal Bluetooth
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
04:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller [10ec:8172] (rev 10)
	Subsystem: Realtek Semiconductor Co., Ltd. RTL8191SEvB Wireless LAN Controller [10ec:8172]
	Kernel driver in use: rtl8192se
06:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
	Subsystem: FIRST INTERNATIONAL Computer Inc Device [1509:3011]
	Kernel driver in use: r8169

[JeremyB]

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sudo apt-get install linux-headers-generic build-essential

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wget https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v3.19-rc1/backports-3.19-rc1-1.tar.gz

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tar -zxvf backports-3.19-rc1-1.tar.gz

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cd backports-3.19-rc1-1

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make defconfig-rtlwifi

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make

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sudo make install

Reboot and see if it helps

[koala236]

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backports-3.19-rc1-1 # sudo make install
  Building modules, stage 2.
  MODPOST 18 modules
  INSTALL /home/julio/backports-3.19-rc1-1/compat/compat.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/btcoexist/btcoexist.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8188ee/rtl8188ee.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192c/rtl8192c-common.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192ce/rtl8192ce.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192cu/rtl8192cu.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192de/rtl8192de.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192ee/rtl8192ee.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8192se/rtl8192se.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8723ae/rtl8723ae.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8723be/rtl8723be.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8723com/rtl8723-common.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl8821ae/rtl8821ae.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl_pci.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtl_usb.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/drivers/net/wireless/rtlwifi/rtlwifi.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/net/mac80211/mac80211.ko
Can't read private key
  INSTALL /home/julio/backports-3.19-rc1-1/net/wireless/cfg80211.ko
Can't read private key
  DEPMOD  3.13.0-37-generic
depmod will prefer updates/ over kernel/ -- OK!
Note:
You may or may not need to update your initramfs, you should if
any of the modules installed are part of your initramfs. To add
support for your distribution to do this automatically send a
patch against "update-initramfs.sh". If your distribution does not
require this send a patch with the '/usr/bin/lsb_release -i -s'
("Ubuntu") tag for your distribution to avoid this warning.

Your backported driver modules should be installed now.
Reboot.

I rebooted and still the same thing...Except now wicd says "No wireless network found" while system network manager say its connected 42% signal with the modem next to me. But if i take 2 steps away from it, it disconnects me.

[JeremyB]

It isn't a good idea to run WICD and Network Manager at the same time as it can cause problems. Have you checked the antenna connections on the wifi card, this may involve removing a cover from the bottom of a laptop

http://beta.ivc.no/wiki/images/thumb/3/ ... nector.jpg
shows the the white antenna wire connected and the black one disconnected just to the right of the black wire is the connector on the card for it

[koala236]

Right. I uninstalled wicd and checked the wires. They're both connected correctly.

Im trying that backport thing again now without WICD, maybe it works.
EDIT:
nope. Still 40% and disconnecting.

Anything else that i can try?

[JeremyB]

Right. I uninstalled wicd and checked the wires. They're both connected correctly.

Im trying that backport thing again now without WICD, maybe it works.
EDIT:
nope. Still 40% and disconnecting.

Anything else that i can try?

Any chance your wifi router is using TKIP encryption, check

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iwlist scan

You want WPA2-AES or WPA2 only

It might work better with

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echo "options rtl8192se ips=0" | sudo tee /etc/modprobe.d/rtl8192se.conf

and reboot

[koala236]

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# iwlist scan
eth0      Interface doesn't support scanning.

lo        Interface doesn't support scanning.

wlan0     Interface doesn't support scanning.

 # echo "options rtl8192se ips=0" | sudo tee /etc/modprobe.d/rtl8192se.conf
options rtl8192se ips=0

I checked the router settings and it is set to WPA-PSK/WPA2-PSK with AES encryption. I've set it to "No security" now just to test and it didnt work. Still the same 30/40%.

[JeremyB]

What does

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iwconfig

show?

[koala236]

What does

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iwconfig

show?

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# iwconfig
eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     no wireless extensions.

[koala236]

Anything I can do to fix this, guys?

[JeremyB]

You could try Larry Fingers latest driver

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sudo apt-get install git linux-headers-$(uname -r)

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git clone https://github.com/lwfinger/rtlwifi_new.git

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make

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sudo make install

And if it isn't any better you can open a issue https://github.com/lwfinger/rtlwifi_new/issues/new and see if a kernel developer can fix it