you should note that acpi-support is deprecated, you need to use
/etc/pm/config.d/ ... try with adding a file there with the following
line:

ADD_PARAMETERS="--quirk-vbemode-restore --quirk-s3-bios"

that helped on some intel cards i have seen in the past ... also if the
screen comes up black, did you try hitting brightness up or down ? it
could be that the backlight just didnt get switched on...

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wakeup problem from suspend
https://bugs.launchpad.net/bugs/242344
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