No matter how much time we spend with a laptop while we review it, there are some things that are just harder to gauge -- namely, what happens once you've owned the thing for a while and the Sandy Bridge-fueled honeymoon comes to an end. That couldn't be more true of the Lenovo ThinkPad X220, one of our favorite ultraportables at the moment. We're seeing assorted reports from folks whose machines keep downthrottling to 800MHz, even when they're plugged in, set to the maximum performance profile, and not overheating. The result, they say, is slower HDD and SSD performance and reduced random read / write speeds, among other pernicious side effects. Worse, the only reliable solution so far seems to be shutting down the system and performing a cold boot. (For some -- but not all -- disabling Intel Speedstep and / or CPU Power Management in the BIOS works, too.) Judging by the threads in Lenovo's user forum, the company is definitely aware of the problem, though it's unclear if it's found a fix yet. We've pinged Lenovo for comment and will let you know what we hear. In the meantime, how's your X220 treating you?