Name
acpi_sleep — ACPI sleep options.
Synopsis
acpi_sleep=[s3_bios],[s3_mode]
Description
During S3 resume (which happens after the machine has been suspended
to RAM), hardware needs to be reinitialized properly. For most
devices this is simple, except for video cards, which are normally
initialized by the BIOS. The kernel does not have enough
information to restore the video device, because that information is in
the BIOS and not accessable at all. This option lets the kernel
try to use the ACPI subsystem to restore the video card in
two different ways.
See the file Documentation/power/video.txt for
more information on this option and how to find the proper value
for your type of hardware.