A computer on which Windows 7 has been deployed via a clean install can stop responding completely after the second restart. This issue also affects Windows Server 2008 R2, Microsoft informed, and is related to the 1394 bus driver.
According to the Redmond company, machines running Windows 7 or Windows Server 2008 R2 can also stop responding when customers enable or install a 1394 device. The IEEE 1394 is a serial bus interface standard most known by the following brands FireWire (Apple), i.LINK (Sony), and Lynx (Texas Instruments).
Microsoft even offered an example of the hardware configuration on which users have been experiencing this problem. The software giant notes that the issue affects PCs with nVidia MCP7A-GeForce 9300 rev B1 motherboard that also feature an LSI Logic FW533 or an FW643 1394 Host controller. Disabling and then enabling, as well as uninstalling and then installing the 1394 host controller will render the machine unresponsive, as will restarting the computer, or putting it to sleep and then waking it.
“This issue occurs because the 1394 bus driver in Windows 7 does not issue an Open Host Controller Interface (OHCI) Soft Reset command to the 1394 host controller when the computer enters a low power (D3) state. When the 1394 host controller later enters a high power (D0) state, it may generate an incorrect PCI-Express packet. In this situation, the motherboard chipset stops responding,” Microsoft explained.
Ahead of Windows 7 and Windows Server 2008 R2, the 1394 bus driver in Windows platforms generated an Open Host Controller Interface (OHCI) Soft Reset command to the 1394 host controller concomitantly with the moment when the PC was entering a low power state. Microsoft doesn’t offer users an update to fix the issue.
However, the company does have a hotfix available for download via Microsoft Support. “If the 1394 host controller is an add-on card, remove the card from the system before you install Windows 7. After setup is complete, apply this hotfix, and then re-enable the 1394 host controller,” the company advised affected users.