1. Forum
  2. Usenet
  3. LINUX.DEBIAN.USER

  • Bluetooth/SSH issue

    From Charles Curley@21:1/5 to All on Sun Jun 16 22:40:02 2024
    On one of my machines, I have some interesting interference. Bluetooth
    works just fine, and so does networking. Bluetooth is normally disabled. However, when I have Bluetooth turned on (and after I turn it off), SSH
    is *slow*.

    I gather that the network controller is also the Bluetooth controller:

    root@tiassa:~# lspci -vs 2:0.0
    02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
    Subsystem: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter
    Flags: bus master, fast devsel, latency 0, IRQ 132, IOMMU group 10
    I/O ports at 4000 [size=256]
    Memory at 80500000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [40] Power Management version 3
    Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [70] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [148] Device Serial Number 00-e0-4c-ff-fe-c8-21-01
    Capabilities: [158] Latency Tolerance Reporting
    Capabilities: [160] L1 PM Substates
    Capabilities: [170] Precision Time Measurement
    Capabilities: [17c] Vendor Specific Information: ID=0003 Rev=1 Len=054 <?>
    Kernel driver in use: rtw_8821ce
    Kernel modules: rtw88_8821ce

    root@tiassa:~# uname -a
    Linux tiassa 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
    root@tiassa:~#

    https://www.realtek.com/Product/Index?id=587

    Is there some sort of cross-talk issue?

    --
    Does anybody read signatures any more?

    https://charlescurley.com
    https://charlescurley.com/blog/

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Ryan Nowakowski@21:1/5 to Charles Curley on Mon Jun 17 01:20:01 2024
    On Sun, Jun 16, 2024 at 02:30:32PM -0600, Charles Curley wrote:
    On one of my machines, I have some interesting interference. Bluetooth
    works just fine, and so does networking. Bluetooth is normally disabled. However, when I have Bluetooth turned on (and after I turn it off), SSH
    is *slow*.
    Is there some sort of cross-talk issue?

    Sometimes Bluetooth and Wi-Fi share the same radio. Are you running ssh over Wi-Fi? Try running ssh over Ethernet while using Bluetooth. Is ssh still slow?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From George at Clug@21:1/5 to All on Mon Jun 17 01:30:01 2024
    Rayan,

    On Monday, 17-06-2024 at 09:18 Ryan Nowakowski wrote:
    On Sun, Jun 16, 2024 at 02:30:32PM -0600, Charles Curley wrote:
    On one of my machines, I have some interesting interference. Bluetooth works just fine, and so does networking. Bluetooth is normally disabled. However, when I have Bluetooth turned on (and after I turn it off), SSH
    is *slow*.
    Is there some sort of cross-talk issue?

    Sometimes Bluetooth and Wi-Fi share the same radio. Are you running ssh over Wi-Fi? Try running ssh over Ethernet while using Bluetooth. Is ssh still slow?

    What do you mean by "Bluetooth and Wi-Fi share the same radio" ?

    In the early days of Windows 8 Tablet and laptop devices, I noticed that the bluetooth mouse would move jerkily while a large download was happening over Wi-Fi. Many people had this issue, and it was so annoying it lead me to tell people not to use
    bluetooth mice.

    You comment might explain why this problem existed, though I am still not sure what "share the same radio" actually means?

    Thanks for your comment,

    George.





    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From eben@gmx.us@21:1/5 to George at Clug on Mon Jun 17 03:30:01 2024
    On 6/16/24 19:27, George at Clug wrote:
    Rayan,

    On Monday, 17-06-2024 at 09:18 Ryan Nowakowski wrote:
    On Sun, Jun 16, 2024 at 02:30:32PM -0600, Charles Curley wrote:
    On one of my machines, I have some interesting interference. Bluetooth
    works just fine, and so does networking. Bluetooth is normally disabled. >>> However, when I have Bluetooth turned on (and after I turn it off), SSH
    is *slow*.
    Is there some sort of cross-talk issue?

    Sometimes Bluetooth and Wi-Fi share the same radio. Are you running ssh over Wi-Fi? Try running ssh over Ethernet while using Bluetooth. Is ssh still slow?

    What do you mean by "Bluetooth and Wi-Fi share the same radio" ?

    There is some circuitry in the computer (the radio) that does both BT and
    wifi (at least 2.4GHz wifi) in some cases, probably by toggling from one to
    the other. They share the same frequency, or are close enough that the same electronics works.

    --
    O freddled gruntbuggly
    Thy micturations are to me
    As plurdled gabbleblotchits on a lurgid bee. -- P. V. Jeltz

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)