We had mentioned before that there are issues with the USB 3.0 implementation in Haswell systems. When a computer with Haswell processor wakes up from S3 sleep mode, problems can occurs with devices connected via USB 3.0. In practice that could result in Acrobat Reader showing a blank PDF file, or that a video stops playing. To solve this, new hardware is required.
Through an official Product Change Notification (PCN) Intel has now confirmed that there really is a problem and that a solution is being worked on. That entails changing the stepping from C1 to C2, which should address the problem of USB 3.0 devices not being recognized after waking from S3 sleep.
This solution will affect the delivery dates of certain products, and according to the PCN that includes the Z87, H87, Q85 and Q87, the C222, C224 and C226, and the QM87, HM87 and HM86.
Update Friday April 5 2013: 23:22
Intel sent us this short statement:
“4th gen Core is on track for a mid-year launch. Intel issued a PCN documenting a chipset USB errata and stating that chipsets with the errata will be in production during the initial ramp. But Intel has confirmed that there is no chance of data loss or corruption. This issue has only been observed with a small subset of USB SuperSpeed thumb drives and does not affect other USB peripherals. We take all customer issues seriously and should any customer have a question or concern they can always contact Intel customer support.”
The complete document can be read here.