http://lwn.net/Articles/243404/
Recently, we have added a feature allowing the user to make the kernel beep
in the early phase of resume, right after it has received control from the
platform, which may help confirm that the control is really passed from the
platform to the kernel. This feature can by activated by executing the
following command:
# r=`cat /proc/sys/kernel/acpi_video_flags` && r=`expr $r + 4` && \
> echo $r > /proc/sys/kernel/acpi_video_flags
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