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I've recently installed Ubuntu 12.04 on my desktop. Everything works fine, i can see wireless networks and connect to them. But, sometimes (This is quite often), my internet speed goes from 2-3 MB/s download speed (On steam) to 0 in 10-20 seconds. Then it goes back to normal. This also often happends in firefox, where i can be surfing around the internet, and it's working just fine. Then it just suddenly can't load any web-pages - and i'm in both cases still connected to the wireless net!

My desktop has the following specs:

Wireless network-card: ASUS PCE-N15
Ram: 8GB kingston RAM.
GPU: GTX 670
CPU: Intel I5 3570
Harddisk: 500gb.
Ubuntu 12.04 full installation, installed after Windows 7 Home Premium 64-bit.
ubuntu is also 64-Bit.

But, it's quite odd. My download rate in Ubuntu is about 1-2 MB/s faster than in Windows 7 (Same computer), but in Ubuntu it just sometimes goes to 0.

I have disabled ipv6, wich actually made the internet become much faster and more stable (It is less likely to reach 0.)

Anyone have any idea about how to solve this?

Thanks!

Update: After i finished downloading from Steam, i've got no connection. I've rebooted the computer, but the internet is really slow now! (About 1/10 of normal).

lspci -nnk | grep -iA2 net:

    02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter [10ec:8178] (rev 01)
    Subsystem: ASUSTeK Computer Inc. Device [1043:84b6]
    Kernel driver in use: rtl8192ce
--
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 09)
    Subsystem: ASUSTeK Computer Inc. Device [1043:8505]
    Kernel driver in use: r8169

lsusb:

Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 1532:001c Razer USA, Ltd RZ01-0036 Optical Gaming Mouse [Abyssus]
Bus 001 Device 004: ID 1532:010b Razer USA, Ltd 

nm-tool:

NetworkManager Tool

State: connected (global)

- Device: eth0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            r8169
  State:             unavailable
  Default:           no
  HW Address:        08:60:6E:E6:3C:57

  Capabilities:
    Carrier Detect:  yes

  Wired Properties
    Carrier:         off


- Device: wlan0  [vokal97kanel58liter] -----------------------------------------
  Type:              802.11 WiFi
  Driver:            rtl8192ce
  State:             connected
  Default:           yes
  HW Address:        50:46:5D:AE:18:A6

  Capabilities:
    Speed:           144 Mb/s

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points (* = current AP)
    *vokal97kanel58liter: Infra, 00:26:24:78:D5:36, Freq 2417 MHz, Rate 54 Mb/s, Strength 73 WPA2
    stund86motto37kahyt: Infra, E8:40:F2:6B:F2:0F, Freq 2442 MHz, Rate 54 Mb/s, Strength 89 WEP
    amab:            Infra, 30:46:9A:1B:4B:59, Freq 2417 MHz, Rate 54 Mb/s, Strength 87 WPA2
    TDC-9BDC:        Infra, 00:19:70:75:73:75, Freq 2452 MHz, Rate 54 Mb/s, Strength 87 WPA WPA2
    skole63video51meter: Infra, 00:26:24:3F:4B:12, Freq 2442 MHz, Rate 54 Mb/s, Strength 87 WPA2

  IPv4 Settings:
    Address:         192.168.87.114
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.87.1

    DNS:             212.10.10.4

Sudo iwlist scan:

eth0      Interface doesn't support scanning.

lo        Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: 00:26:24:78:D5:36
                    Channel:2
                    Frequency:2.417 GHz (Channel 2)
                    Quality=63/70  Signal level=-47 dBm  
                    Encryption key:on
                    ESSID:"vokal97kanel58liter"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=00000000bd61ad42
                    Extra: Last beacon: 60ms ago
                    IE: Unknown: 0013766F6B616C39376B616E656C35386C69746572
                    IE: Unknown: 010882848B962430486C
                    IE: Unknown: 030102
                    IE: Unknown: 2A0104
                    IE: Unknown: 2F0104
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 32040C121860
                    IE: Unknown: 2D1AFC181BFFFF000000000000000000000000000000000000000000
                    IE: Unknown: 3D1602080400000000000000000000000000000000000000
                    IE: Unknown: DD090010180202F02C0000
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

iwconfig:

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"vokal97kanel58liter"  
          Mode:Managed  Frequency:2.417 GHz  Access Point: 00:26:24:78:D5:36   
          Bit Rate=144.4 Mb/s   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
          Power Management:off
          Link Quality=68/70  Signal level=-42 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:82   Missed beacon:0

rfkill list all:

0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

Update 2: It's somehow a bit more stable now. But i can only get 1-2 MB download rate in a speed test, but in windows i get about 30 MB.

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Please open the terminal(ctrl+alt+t) run the commands one line at a time: lspci -nnk | grep -iA2 net lsusb nm-tool sudo iwlist scan iwconfig rfkill list all –  Wild Man Aug 8 '13 at 21:03
    
Theese are now added to the post. Thank you. –  Guns4Pandas Aug 9 '13 at 10:53
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1 Answer

This seems to be the same chipset, as yours.

How to get a stable WLAN-connection with a Lenovo x121e?

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1  
Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. Plus, there is no reason to be a smart aleck and tell folks to use Google. ;-) –  Kevin Bowen Aug 9 '13 at 0:52
    
You don't know how much time i've spent on google. I've used 2 days finding a solution. I believe i must now have checked this, as it was a Lenovo - but when i think about it, lenovo isn't just laptops facepalm –  Guns4Pandas Aug 9 '13 at 10:02
    
Yeah sorry, it wasn't my intent to play a smart aleck. I've just typed in your network chipset rather than the name of your laptop and plenty of answers did come up. So, I wrongly assumed that you didn't look up google. –  piotrektt Aug 9 '13 at 14:22
    
Have you installed a new driver? This driver is problematic, there is something we can try with it but usually installing a newer driver works better. –  Wild Man Aug 9 '13 at 15:44
    
Change this 802.11b/g/n to this 802.11b/g in the router it is usually needed but we may still have to install a driver. Run this command echo 'options rtl8192se swenc=1' | sudo tee /etc/modprobe.d/rtl8129.conf –  Wild Man Aug 9 '13 at 16:05
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