Since installing SP1 on a system running Win7 Ultimate x64 I have had a problem where the system BSODs after going into sleep mode immediately after logging back in.
The minidump points to ataport.SYS and ntoskrnl.exe with a consistent Bug Check Code of 0x000000d1.
1 crash also involved volmgr.sys. A copy of that minidump has been posted to: [deleted]
More system details available. This was an issue on a Dell Precision T3500.