We have a poorly behaving BIOS that simply returns from its suspend procedure, rather then jumping to the restart routine indicated by the FACS. This appears to Linux as a failed S3 attempt. This would normally succeed, but the sysenter msrs are not restored and the restart fails. It is not clear if this is the only omission, but if the sysenter msrs are manually entered in the debugger, the OS resumes. The attached patch would invoke the register restore function on failure. This has absolutely no effect on correct systems, and, "does the right thing" for failed or stupid BIOSes, at least as far as I am concerned. Comments? Jordan -- Jordan Crouse Senior Linux Engineer Advanced Micro Devices, Inc.