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Thread: RTL8188CE / Ubuntu 12.04 / Sager 8130

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  1. #1
    Join Date
    Jun 2012
    Beans
    1

    RTL8188CE / Ubuntu 12.04 / Sager 8130

    Hello, I recently installed Ubuntu 12.04 64-bit with Wubi on my laptop which has Windows 7 64-bit. Even though the wireless was recognized and worked out of the box, it is very unstable. I have tried to find solutions online but my situation differs from the general slow wireless problem. My wireless is not slow but unstable. I am using Chrome and I constantly see Error 102 (net::ERR_CONNECTION_REFUSED) and Error 137 (net::ERR_NAME_RESOLUTION_FAILED) or it takes a longer than usual time to load a page but when a website is opened successfully, the connection is fast and I can download at normal speed. I tried Firefox too but it did not solve the problem. I have tried these solutions: http://www.unixmen.com/resolve-slow-...natty-narwhal/ and setting the MTU to 1500 (from automatic) as well as some others.

    I am new to linux so please write out the commands you mention so I can copy paste them. I will try to post as much information as I can, hopefully they will all be helpful for solving this issue. Since the current router settings work normally in Windows I am hoping to not change the router settings such as disabling N and using B/G instead as that would be avoiding the problem and not solving it.

    Code:
    Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
    
    ifconfig
    eth0      Link encap:Ethernet  HWaddr 00:90:f5:b7:c4:eb  
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:53 
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:510 errors:0 dropped:0 overruns:0 frame:0
              TX packets:510 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:50389 (50.3 KB)  TX bytes:50389 (50.3 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 48:5d:60:cf:37:25  
              inet addr:192.168.1.108  Bcast:192.168.1.255  Mask:255.255.255.0
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:32802 errors:0 dropped:0 overruns:0 frame:0
              TX packets:22152 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:45127805 (45.1 MB)  TX bytes:2381810 (2.3 MB)
    
    
    iwconfig
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11bgn  ESSID:"Sleipnir"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 58:6D:8F:0E:52:A4   
              Bit Rate=72.2 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
              Power Management:off
              Link Quality=58/70  Signal level=-52 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:336   Missed beacon:0
    
    eth0      no wireless extensions.
    
    
    lsmod
    Module                  Size  Used by
    rtl8192ce              84826  0 
    rtl8192c_common        75767  1 rtl8192ce
    rtlwifi               111202  1 rtl8192ce
    
    
    dmesg | grep rtl
    [    9.638595] rtl8192ce 0000:04:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
    [    9.638605] rtl8192ce 0000:04:00.0: setting latency timer to 64
    [    9.987448] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
    [    9.987849] rtlwifi: wireless switch is on
    [   14.857832] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cfw.bin
    [   15.393241] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cfw.bin
    
    
    sudo lshw -C network
      *-network               
           description: Ethernet interface
           product: JMC250 PCI Express Gigabit Ethernet Controller
           vendor: JMicron Technology Corp.
           physical id: 0
           bus info: pci@0000:03:00.0
           logical name: eth0
           version: 05
           serial: 00:90:f5:b7:c4:eb
           size: 10Mbit/s
           capacity: 1Gbit/s
           width: 32 bits
           clock: 33MHz
           capabilities: pm pciexpress msix msi bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
           configuration: autonegotiation=on broadcast=yes driver=jme driverversion=1.0.8 duplex=half latency=0 link=no multicast=yes port=MII speed=10Mbit/s
           resources: irq:53 memory:f6320000-f6323fff ioport:d100(size=128) ioport:d000(size=256) memory:f6310000-f631ffff memory:f6300000-f630ffff
      *-network
           description: Wireless interface
           product: RTL8188CE 802.11b/g/n WiFi Adapter
           vendor: Realtek Semiconductor Co., Ltd.
           physical id: 0
           bus info: pci@0000:04:00.0
           logical name: wlan0
           version: 01
           serial: 48:5d:60:cf:37:25
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=rtl8192ce driverversion=3.2.0-24-generic firmware=N/A ip=192.168.1.108 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
           resources: irq:18 ioport:c000(size=256) memory:f6200000-f6203fff
    
    
    iwlist scan
    wlan0     Scan completed :
              Cell 01 - Address: 58:6D:8F:0E:52:A4
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=57/70  Signal level=-53 dBm  
                        Encryption key:on
                        ESSID:"Sleipnir"
                        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=0000004538c0818e
                        Extra: Last beacon: 4308ms ago
                        IE: Unknown: 0008536C6569706E6972
                        IE: Unknown: 010882848B962430486C
                        IE: Unknown: 030106
                        IE: Unknown: 2A0100
                        IE: Unknown: 2F0100
                        IE: IEEE 802.11i/WPA2 Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (2) : CCMP TKIP
                            Authentication Suites (1) : PSK
                        IE: Unknown: 32040C121860
                        IE: Unknown: 2D1AFC181BFFFF000000000000000000000000000000000000000000
                        IE: Unknown: 3D1606080000000000000000000000000000000000000000
                        IE: Unknown: DD6E0050F204104A00011010440001021041000100103B0001031047001036918C47F88B8D2739AA36757336690E10210005436973636F102300054531323030102400063132333435361042000234321054000800060050F2040001101100054531323030100800020084103C000101
                        IE: Unknown: DD090010180201F0040000
                        IE: WPA Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (2) : CCMP TKIP
                            Authentication Suites (1) : PSK
                        IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

  2. #2
    Join Date
    Apr 2007
    Beans
    1

    Unhappy Re: RTL8188CE / Ubuntu 12.04 / Sager 8130

    Hi,

    I'm experiencing the same unstable connection on Ubuntu 12.04 with the RTL8188CE on a Toshiba Satellite C660.

    The same occurs with Linux Mint 13 Mate, which makes sense since it's based on Ubuntu.

    Using Windows 7 the connection is stable, so I'm guessing this is related to the drivers.

    It got so unstable that after 1min of connection to the WLAN Router, I had to dis- and reconnect to be able to use the internet for another 1-2min until it broke down again. Ubuntu will show me that I'm connected to the router with a strong signal even when the problem occurs. Strangely the connection has been quite stable for the last 30min. Maybe it's also related to heavy network usage (downloading using full bandwidth)

    Code:
    ~$ lspci | grep Network
    03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
    
    ~$ ifconfig
    eth0      Link encap:Ethernet  HWaddr dc:0e:a1:46:f5:24  
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:41 Base address:0xe000 
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:1578 errors:0 dropped:0 overruns:0 frame:0
              TX packets:1578 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:152613 (152.6 KB)  TX bytes:152613 (152.6 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 9c:b7:0d:99:9e:8a  
              inet addr:192.168.0.35  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::9eb7:dff:fe99:9e8a/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:135065 errors:0 dropped:0 overruns:0 frame:0
              TX packets:72795 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:188307204 (188.3 MB)  TX bytes:7104601 (7.1 MB)
    
    ~$ iwconfig
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11bgn  ESSID:"BWLAN"  
              Mode:Managed  Frequency:2.472 GHz  Access Point: 80:C6:AB:1D:AC:E1   
              Bit Rate=72.2 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
              Power Management:off
              Link Quality=55/70  Signal level=-55 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0   Missed beacon:0
    
    eth0      no wireless extensions.

  3. #3
    Join Date
    Feb 2012
    Beans
    1

    Re: RTL8188CE / Ubuntu 12.04 / Sager 8130

    Hi,

    I know it's an old topic but I've got the same problem with the RTL8188CE driveron a Toshiba Satellite C???(don't remember the exact number)
    I'm wondering if the problem has been solved now.

    Thanks!

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