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I use Windows 10 and Ubuntu 21.04 with multiboot, and Ubuntu cannot find wifi drivers (no wifi adaptors found)

cn flag

I was using Ubuntu 21.04 with mt7921 MEDIATEK NETWORK controller as internal wireless network device, and wifi functioned well until i installed Windows 10 to another hard disk partition Fortunately both ubuntu and windows boot well and Windows 10 does find wifi, but ubuntu cannot find wifi. I use notebook Acer Swift sf314-43 and kernel version 5.12.9-051209-generic. Please help me... I knew my wireless network device's driver name is mt7921e (because i used ubuntu 20.04 at first but my notebook could not find wifi and solved with installing 21.04 and updating kernel to version 5.12.9, spending all days trying to install proper driver... everything was useless.

I tried change settings in windows 10: disable Turn on fast startup, and my network device's driver is up to date in windows, but nothing changed.

Here are outputs:

dmesg|grep mt7921 : I think this is where the problem is but cannot handle it

[    2.329810] kernel: mt7921e 0000:01:00.0: enabling device (0000 -> 0002)

[    2.330018] kernel: mt7921e 0000:01:00.0: ASIC revision: 79610010

[    2.332303] kernel: mt7921e: probe of 0000:01:00.0 failed with error -5

lspci

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 7
01:00.0 Network controller: MEDIATEK Corp. Device 7961
02:00.0 Non-Volatile memory controller: Kingston Technology Company, Inc. OM3PDP3 NVMe SSD (rev 01)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Lucienne (rev c2)
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
03:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
03:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
03:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
03:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
03:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller
04:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 81)
04:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 81)

dmesg |grep -i wire

[    1.635991] usb 1-4: Product: Wireless_Device
[    2.141201] input: Acer Wireless Radio Control as /devices/LNXSYSTM:00/10251229:00/input/input12

rfkill list all

0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: acer-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

lshw -C network

  *-network                 
       description: Network controller
       product: MEDIATEK Corp.
       vendor: MEDIATEK Corp.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: /dev/fb0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm cap_list fb
       configuration: depth=32 latency=0 mode=1920x1080 visual=truecolor xres=1920 yres=1080
       resources: iomemory:fc0-fbf iomemory:fc0-fbf iomemory:fc0-fbf memory:fca0200000-fca02fffff memory:fca0300000-fca0303fff memory:fca0304000-fca0304fff
  *-network
       description: Ethernet interface
       physical id: 1
       bus info: usb@2:2
       logical name: enxf8e43b019dd4
       serial: f8:e4:3b:01:9d:d4
       size: 100Mbit/s
       capacity: 1Gbit/s
       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=ax88179_178a driverversion=5.12.9-051209-generic duplex=full ip=192.168.219.101 link=yes multicast=yes port=MII speed=100Mbit/s

in flag
How do you switch from Windows to Ubuntu? Do you tell Windows to “Reboot” or “Shutdown”? Sometimes Windows will power-down internal devices, and this affects them when booting into something else. Although annoying, it’s occasionally better to use “Shutdown”, then turn the machine on and boot into Ubuntu
rudxor02 avatar
cn flag
it's same when i reboot or shutdown from windows and i noticed that when i turn off notebook and wait long time, then turn on first on ubuntu it makes wifi function well but after boot from windows it does not
mangohost

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