If you see this device listed as an "Unknown Device" or "SM Bus Controller" with a yellow exclamation mark in Device Manager, you need to install the Intel Chipset Device Software MSI Global English Forum
The hardware identifier you provided refers to the Intel(R) 8 Series/C220 Series SMBus Controller pci ven8086 ampdev8c22 ampsubsys309f17aa amprev04 patched
Visit the Lenovo Support page for your specific laptop model (e.g., T440p) and install the "Chipset" drivers. If you see this device listed as an
While driver patching is a legitimate and necessary tool for embedded systems engineers and enthusiasts repairing legacy hardware, it is rarely the first solution for a malfunctioning storage controller. Before you alter a single byte of an .inf file or download a shady "patched driver" from a forum, ensure you have exhausted official support channels from Intel and Lenovo. Your data’s integrity—and the stability of your entire system—depends on the correct, unmodified operation of that REV_04 chip. Your data’s integrity—and the stability of your entire
This issue frequently occurs after a clean install of Windows 10 or 11. While Windows Update sometimes provides a generic driver, it can occasionally overwrite functional drivers with basic versions that lack full feature support, leading to the "patched" or "exclamation mark" status. How to Fix the Missing SMBus Controller Driver
Many users on Linux forums reported that 8086:8c22 rev 04 on Lenovo hardware would negotiate a SATA link speed of 1.5 Gbps (SATA I) instead of 6.0 Gbps (SATA III). The unpatched kernel would misread the controller’s speed capabilities due to a bad Capabilities register. The patch involved blacklisting the automatic speed negotiation for this specific subsystem and forcing a link re-initialization.