After 3 days of digging, I found the fix for the OptiPlex 790 and 990 PCI Serial Port Driver issue which shows as a yellow triangle under Device Manager. ![]() Lenovo makes no representation or warranty regarding third party products or services. I can you tell me from time and ISAPNP Services. I did a clean install of Windows 10 on the x220T and installed all drivers and updates. The Lenovo ThinkCentre M91p is a premium enterprise-class desktop computers optimized for high performance and manageability.Ī faster and easier option is to use the Driver Update Utility for Lenovo to scan your system for free. Solved, I have this same problem after upgrading my 6200 Pro finally to W10. ![]() Not sure of the name for the driver though unless I'm required to open up the computer, then I'll do that. Download Now LENOVO M91P PCI SERIAL PORT DRIVER
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