I edited /etc/modules and changed the radeonfb line to read
radeonfb force_sleep=1
I rebooted, suspended, resumed and checked dmesg -- nothing about going
to D2 sleep.
I then rebooted and added video=radeonfb:force_sleep=1 to the kernel
command line, suspended, resumed and checked dmesg. Nothing about going
to D2 sleep.
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Excessive battery usage in ACPI sleep
https://launchpad.net/bugs/65856
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