Hi @chaoqin, I can't find the device "8086:4b7e", I have also tried the mainline kernel v5.14-rc6 but no luck. I also tried to boot into the UEFI shell and use the 'pci' command to list the devices, but still no luck. [1] Do I need to enable some settings in BIOS so that I can see the device "8086:4b7e"? Thanks! BIOS version: EHLSFWI1.R00.3044.A01.2101210945 -- [1] Shell> pci Seg Bus Dev Func --- --- --- ---- 00 00 00 00 ==> Bridge Device - Host/PCI bridge Vendor 8086 Device 452E Prog Interface 0 00 00 02 00 ==> Display Controller - VGA/8514 controller Vendor 8086 Device 4571 Prog Interface 0 00 00 08 00 ==> Base System Peripherals - Other system peripheral Vendor 8086 Device 4511 Prog Interface 0 00 00 10 00 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B44 Prog Interface 0 00 00 10 01 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B45 Prog Interface 0 00 00 11 00 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B96 Prog Interface 8 00 00 11 01 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B97 Prog Interface 9 00 00 13 00 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B84 Prog Interface 14 00 00 14 00 ==> Serial Bus Controllers - USB Vendor 8086 Device 4B7D Prog Interface 30 00 00 14 02 ==> Memory Controller - RAM memory controller Vendor 8086 Device 4B7F Prog Interface 0 00 00 15 00 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B78 Prog Interface 0 00 00 15 02 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B7A Prog Interface 0 00 00 15 03 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B7B Prog Interface 0 00 00 16 00 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B70 Prog Interface 0 00 00 17 00 ==> Mass Storage Controller - Serial ATA controller Vendor 8086 Device 4B63 Prog Interface 1 00 00 19 00 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B4B Prog Interface 0 00 00 19 02 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B4D Prog Interface 0 00 00 1A 00 ==> Base System Peripherals - SD Host controller Vendor 8086 Device 4B47 Prog Interface 1 00 00 1A 01 ==> Base System Peripherals - SD Host controller Vendor 8086 Device 4B48 Prog Interface 1 00 00 1B 00 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4BB9 Prog Interface 0 00 00 1B 01 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4BBA Prog Interface 1 00 00 1B 06 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4BBF Prog Interface 6 00 00 1C 00 ==> Bridge Device - PCI/PCI bridge Vendor 8086 Device 4B3E Prog Interface 0 00 00 1D 00 ==> Base System Peripherals - Other system peripheral Vendor 8086 Device 4BB3 Prog Interface 35 00 00 1D 01 ==> Network Controller - Ethernet controller Vendor 8086 Device 4BA0 Prog Interface 18 00 00 1E 00 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B28 Prog Interface 0 00 00 1E 01 ==> Simple Communications Controllers - Other communication device Vendor 8086 Device 4B29 Prog Interface 0 00 00 1F 00 ==> Bridge Device - PCI/ISA bridge Vendor 8086 Device 4B00 Prog Interface 0 00 00 1F 03 ==> Multimedia Device - Audio device Vendor 8086 Device 4B58 Prog Interface 0 00 00 1F 04 ==> Serial Bus Controllers - System Management Bus Vendor 8086 Device 4B23 Prog Interface 0 00 00 1F 05 ==> Serial Bus Controllers - Other bus type Vendor 8086 Device 4B24 Prog Interface 0 00 01 00 00 ==> Network Controller - Other network controller Vendor 8086 Device 2526 Prog Interface 0 Shell>