If you are running Linux, you can suspend using the following command, to re-initialize the GPU when resuming, which works around some ACPI bugs:

    pm-suspend --quirk-vbe-post

I have a 1st-gen Lenovo X1 Yoga, and it is the only laptop series that has everything I want: an OLED display, a stylus, and a TrackPoint input. ACPI worked fine when I first bought it, and I can't remember if it's had one BIOS update or two, but after the most recent update, it sometimes won't wake from sleep. When that happens, he power LED fades on and off, no matter how many times I press the power button or close and open the lid. I have to hold the power button to force it off, then power it back on from a fresh boot.

Also, the Linux kernel added support for adjusting the OLED's brightness through ACPI, years ago, but it's never been supported on my laptop, and I have to resort to using xrandr to output dimmer images, which reduces bit depth.

My fan sometimes gets stuck on full speed, too.