I am struggling with suspend-to-ram on my Acer Aspire V3 772G with Gentoo. My configuration:Gentoo 3.12.5 kernel (.config)/etc/portage/make.confPortage world file1) It works in Windows 7 and Linux LiveCD (Ubuntu 13.10). Therefore hardware is fine and it's not a general Linux issue, the cause must be in my Gentoo installation2) On Gentoo it fails both in console and X (black screen after resume). In order to debug I tried the following:dmesg > dmesg_before.ker; echo mem > /sys/power/state; dmesg > dmesg_after.kerThe results: dmesg_before.ker / dmesg_after.kerSince dmesg_after.ker was created, I can suspect BIOS resume works fine, but the graphics driver (i915) is the issue.3) I wondered if it would work without i915 driver. Since it was built into kernel, I recompiled the kernel with the driver built as a module (new .config) and:dmesg > dmesg_before.mod; echo mem > /sys/power/state; dmesg > dmesg_after.modSuprisingly, the suspend failed stopping at Suspending console(s) message. It was both with i915 module loaded and unloaded. Here's dmesg_before.mod.4) I also tried other kernel versions (3.10.17, 3.12.0) and newest unstable xf86-video-intel package, but no luck, same results.I feel this is something trivial, like some kernel parameter or a package missing, but I don't know how to debug it further. Any hints?EDIT: I was actually able to type touch TEST; reboot blindly after resume. It means that the resume is in fact successful, the only issue is that the screen remains off. 
Suspend-to-ram fails on Gentoo with i915
gentoo;suspend;acpi;intel;i915