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Thread: Realtek RTL8188CUS very slow download speed

  1. #1

    Default Realtek RTL8188CUS very slow download speed

    Hello,

    I use openSUSE (Xfce) on my Desktop PC.

    openSUSE Tumbleweed (July 28, 2020)
    http://download.opensuse.org/tumblew...iso?mirrorlist

    I have installed openSUSE on an internal hard disk and have not set anything after installation. I only use the default setting.

    After installation I connected to my Wi-Fi network immediately (my internet data plan is 21.6 Mbits maximum), but the download speed is extremely low compared to Windows 8.1.

    openSUSE achieves only these results in the speedtest:
    0.88 Mbits/s (Download)

    4.07 Mbps (Upload)


    Windows 8.1
    10.18 Mbps (Download)

    4.63 Mbit/s (Upload)

    On Windows 8.1, the Wi-Fi adapter there is called RTL8188CU. On openSUSE, it is called RTL8188CUS. I don't know why, it's different on openSUSE. I only use the default setting and have nothing installed.

    On Windows 8.1 I only use the default driver on Windows 8.1, I have nothing installed except all Windows updates (July 2020) and Firefox 78.0.2.

    I looked at YaST Hardware Information and it says that it uses the rtl8192cu driver. What to do?

    Can the developers fix the bug here? I think the standard driver for RTL8188CU on openSUSE needs to be improved. How can I solve this problem? I am a beginner. Thanks for the help.

  2. #2
    Join Date
    Mar 2011
    Location
    Sauerland
    Posts
    4,696

    Default AW: Realtek RTL8188CUS very slow download speed

    Is this an USB Stick?
    Post
    Code:
    lsusb
    Use Code-Tags:
    https://forums.opensuse.org/showthre...und-Your-Paste

  3. #3

    Default Re: AW: Realtek RTL8188CUS very slow download speed

    Quote Originally Posted by Sauerland View Post
    Is this an USB Stick?
    I don't know. It's a purchased desktop computer.

    I've never seen the Wi-Fi adapter or a USB stick before. It's in the PC and a friend of mine removed a blue cable (USB) from the motherboard and then the Wi-Fi adapter was not visible in Windows 8.1.

    Is this a USB stick for you?



    Code:
    lsusb
    Code:
    Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 006: ID 046d:c08b Logitech, Inc. 
    Bus 001 Device 005: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
    Bus 001 Device 004: ID 195d:2074 Itron Technology iONE 
    Bus 001 Device 003: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
    Bus 001 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 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

  4. #4
    Join Date
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    Default AW: Realtek RTL8188CUS very slow download speed

    Bus 001 Device 003: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
    Here on Kernel 5.7:
    Code:
    modprobe -c | grep -i "0bda.*8176"
    alias usb:v0BDAp8176d*dc*dsc*dp*ic*isc*ip*in* rtl8192cu
    alias usb:v0BDAp8176d*dc*dsc*dp*icFFiscFFipFFin* rtl8xxxu
    So 2 modules are maybe using for this USB-Stick.


    So post:
    Code:
    modprobe -c | grep -i "0bda.*8176"

  5. #5

    Default Re: AW: Realtek RTL8188CUS very slow download speed

    So post:
    Code:
    modprobe -c | grep -i "0bda.*8176"
    Code:
    modprobe: command not found
    I then got the tip from the friend to enter that and it showed a result in Terminal.

    Code:
    sudo modprobe -c | grep -i "0bda.*8176"
    [sudo] password for root: --- enter my password ---
    Result:

    Code:
    alias usb:v0BDAp8176d*dc*dsc*dp*ic*isc*ip*in* rtl8192cu
    alias usb:v0BDAp8176d*dc*dsc*dp*icFFiscFFipFFin* rtl8xxxu

  6. #6
    Join Date
    Mar 2011
    Location
    Sauerland
    Posts
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    Default AW: Realtek RTL8188CUS very slow download speed

    As root:
    Code:
    lsmod | grep -i rtl
    Please ever the whole commandline and output:
    Code:
    linux64:~ # lsmod | grep -i rtl
    
    btrtl                  24576  1 btusb
    bluetooth             700416  43 btrtl,btintel,btbcm,bnep,btusb,rfcomm
    Last edited by Sauerland; 30-Jul-2020 at 23:32.

  7. #7

    Default Re: Realtek RTL8188CUS very slow download speed

    Code:
    rtl8xxxu              151552  0
    rtl8192cu             102400  0
    rtl_usb                24576  1 rtl8192cu
    rtl8192c_common        73728  1 rtl8192cu
    rtlwifi               135168  3 rtl8192c_common,rtl_usb,rtl8192cu
    mac80211             1044480  4 rtl_usb,rtl8192cu,rtlwifi,rtl8xxxu
    cfg80211              888832  3 rtlwifi,mac80211,rtl8xxxu
    usbcore               335872  11 xhci_hcd,ehci_pci,usbhid,rtl_usb,rtl8192cu,usb_storage,ehci_hcd,xhci_pci,rtl8xxxu,uas,ums_realtek

  8. #8
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    Default AW: Realtek RTL8188CUS very slow download speed

    As root:

    Code:
    modprobe -r rtl8xxxu
    Restart your network.

    Better?

  9. #9

    Default Re: Realtek RTL8188CUS very slow download speed

    It's working now.

    Then I also restart my Desktop PC and connect it to the Wi-Fi network. That works too.

    The download speed is now fast, like on Windows 8.1. I hope it remains so permanent.

    Thank you very much.

  10. #10
    Join Date
    Mar 2011
    Location
    Sauerland
    Posts
    4,696

    Default AW: Realtek RTL8188CUS very slow download speed

    It's working now.
    After removing rtl8xxxu?

    Then blacklist it:
    Code:
    echo 'blacklist rtl8xxxu' > /etc/modprobe.d/disable-rtl8xxxu.conf
    Last edited by Sauerland; 31-Jul-2020 at 11:15.

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