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Suspend hangs

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https://bbs.archlinux.org – I have a Lenovo Thinkpad X1 Carbon, running Arch Linux booting from UEFI/GRUB. Sometimes when I suspend (to RAM) the system hangs in the process. It used to happen maybe 5% times, but after recent upgrades, it's more of 30% chance. This laptop has a LED indicating suspend/resume status. When it's in the process of suspending/resuming, it flashes, when it's suspended, it slowly fades in and out.I have laptop-mode-tools and pm-utils installed but I never use it.What happens is that when I suspend (using XFCE or with sysctl suspend), the screen goes blank (as in turned off, no curs (HowTos)