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Re: strange problem with usb wifi adapter

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On Sat 11 Dec 2021 at 22:03:41 (+0000), Long Wind wrote:

> David is right, lsusb:
> Bus 002 Device 004: ID 148f:7601 Ralink Technology, Corp. MT7601U Wireless Adapter
> 
> i do some interesting test, am able to reproduce my problem,
> it reaffirm my suspicion that it's related to power cutoff,
> something i can't explain because of my limited hardware knowledge  
> 
> i think my adapter uses mt7601u.bin in /lib/firmware
> i remove firmware-misc-nonfree, wifi works even after reboot
> though /lib/firmware/mt7601u.bin is gone
> 
> then i shutdown and unplug power cord and wait for half minute
> i  plug power cord and boot, same problem arise
>  lsusb can list my adapter, but "ip link" doesn't show it
> and i have to install firmware-misc-nonfree to solve it

Firmware isn't like most software, where it's read from the
filesystem whenever it's needed. It's not even like heavily
used software, where it's kept in cache in memory to avoid
having to read the filesystem so frequently.

What you appear to be describing is a case where the kernel
module loads some firmware into the chips inside the device,
making it work correctly. And until the power is removed
from those chips, the firmware remains in the chips.

In days of yore, many people had to initialise some internal
devices in PCs using DOS, and then perform what was termed
a warm/soft reboot to load linux without losing the effects
of the initialisation.

Cheers,
David.

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Thread

strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-11 06:40 +0100
  Re: strange problem with usb wifi adapter <tomas@tuxteam.de> - 2021-12-11 08:50 +0100
    Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-11 09:20 +0100
      Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-11 09:20 +0100
      Re: strange problem with usb wifi adapter Cindy Sue Causey <butterflybytes@gmail.com> - 2021-12-11 09:30 +0100
        Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-11 10:00 +0100
          Re: strange problem with usb wifi adapter Andrei POPESCU <andreimpopescu@gmail.com> - 2021-12-11 10:30 +0100
      Re: strange problem with usb wifi adapter <tomas@tuxteam.de> - 2021-12-11 09:50 +0100
  Re: strange problem with usb wifi adapter "Andrew M.A. Cater" <amacater@einval.com> - 2021-12-11 13:20 +0100
    Re: strange problem with usb wifi adapter David Wright <deblis@lionunicorn.co.uk> - 2021-12-11 20:40 +0100
      Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-11 23:10 +0100
        Re: strange problem with usb wifi adapter David Wright <deblis@lionunicorn.co.uk> - 2021-12-12 00:20 +0100
          Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-12 01:20 +0100
            Re: strange problem with usb wifi adapter David Wright <deblis@lionunicorn.co.uk> - 2021-12-12 03:00 +0100
            Re: strange problem with usb wifi adapter "Andrew M.A. Cater" <amacater@einval.com> - 2021-12-12 11:10 +0100
              Re: strange problem with usb wifi adapter <tomas@tuxteam.de> - 2021-12-12 11:30 +0100
                Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-12 14:10 +0100
                Re: strange problem with usb wifi adapter Curt <curty@free.fr> - 2021-12-12 14:40 +0100
                Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-15 11:10 +0100
                Re: strange problem with usb wifi adapter Curt <curty@free.fr> - 2021-12-15 12:40 +0100
                Re: strange problem with usb wifi adapter "Andrew M.A. Cater" <amacater@einval.com> - 2021-12-15 19:00 +0100
                Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-16 02:30 +0100
                Re: strange problem with usb wifi adapter Long Wind <longwind2@yahoo.com> - 2021-12-16 04:30 +0100
                Re: strange problem with usb wifi adapter <tomas@tuxteam.de> - 2021-12-12 14:40 +0100
              Re: strange problem with usb wifi adapter Curt <curty@free.fr> - 2021-12-12 14:00 +0100
  Re: strange problem with usb wifi adapter Joe <joe@jretrading.com> - 2021-12-11 16:00 +0100
    Re: strange problem with usb wifi adapter Andrei POPESCU <andreimpopescu@gmail.com> - 2021-12-12 10:00 +0100
      Re: strange problem with usb wifi adapter Brian <ad44@cityscape.co.uk> - 2021-12-12 13:00 +0100

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