I recently bought a new desktop, and everything's been running fine, except I noticed this issue, Upon going into my devices and printers, there's a little troubleshooting triangle next to my desktop's symbol, so I troubleshooted it, told me PCI and SM Bus Controller had no drivers. Intel does not make finding a driver for an unknown SM Bus Controller easy. Download Lenovo laptop and netbook drivers or install DriverPack Solution for automatic driver update. I have a XPS420 and I've got the yellow exclamation point next to SM Bus Controller in my device manager. I just installed a fresh copy of windows 7 64 bit on a thinkpad t400 4236 and I'm missing the sm bus controller driver. I recently did a system System Diagnostic test on my PC and the test revealed that I needed a SM Bus Controller Device. Download Now SM BUS CONTROLLER LENOVO G50 DRIVER
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