From hibernate, backlight on, then out

[precip9]

Software bug on an X61 tablet running Windows 7.

Restoring from hibernate, sometimes, always after the "Close Encounters" logo assembles, the backlight goes out. The machine responds to a fingerprint logon, and appears to be operating normally otherwise.

This is a software bug. The BIOS splash screen and Windows logo always appears before the backlight goes out. Toggling the internal/external display has no effect. I associate it with having tethered a Samsung phone prior to hibernation.

I have not hooked up an external display, but it's definitely not a hardware problem.

Has anyone found a workaround?