| Error Message | Likely Cause | Solution | |---|---|---| | “This device cannot start. (Code 10)” | IRQ conflict or power management | Go to driver properties → Advanced → Uncheck “Allow the computer to turn off this device” | | “Driver is unsigned” (Windows 11) | Exclusive driver uses SHA-1 certificate | Boot into “Disable Driver Signature Enforcement” → Install → Permanently sign using SignTool | | PCI Serial Port disappears after reboot | Fast Startup feature | Control Panel → Power Options → Choose what power buttons do → Uncheck “Turn on fast startup” | | No COM port assigned | Driver installed but port not enumerating | Use “Add legacy hardware” wizard → Manually select “PCI Serial Port” → Set COM3 or higher | | Data corruption or garbage characters | Baud rate mismatch or FIFO issue | Open Device Manager → Port Settings → Advanced → Lower FIFO buffers (receive to 8, transmit to 8) |
Microsoft often hosts legacy and specific hardware drivers under its optional updates panel. Press to open Settings .
| Vendor ID | Manufacturer | |-----------|--------------| | 8086 | Intel | | 1022 | AMD | | 14e4 | Broadcom | | 10ec | Realtek | | 1b21 | ASMedia | exclusive download driver pci serial port 60806a
Older motherboard chipsets requiring specialized management engine drivers.
A: Yes, but Linux does not need an exclusive download. The kernel module 8250_pci or mcs9922 usually handles 60806A natively. Use lspci -v to confirm. | Error Message | Likely Cause | Solution
Select the version corresponding to your operating system architecture (64-bit is standard for modern systems).
Older systems route serial ports through an onboard Super I/O chip manufactured by Realtek, Nuvoton, or ITE. | Vendor ID | Manufacturer | |-----------|--------------| |
"PCI Serial Port" under Device Manager [1]. "No Driver Installed" Error: Code 28 in Device Manager.