I've a laptop that was fine under F18, but since upgrading to F20 over the weekend, now has difficulties with suspending, and with turning the laptop's backlight on again.
The symptoms are:
On a freshly booted system, login, and where I *haven't* yet connected my external monitor, closing and opening the laptop lid suspends and resumes fine.
If I plug in the external monitor, wait a bit, unplug the external monitor and wait a bit more, then from then onwards, closing the lid causes a suspend followed immediately by a resume (i.e. with the lid still closed).
The second issue is that once suspend is broken, if I halt the machine, power off (and even remove the laptop battery), then when I reboot, at a late point in the boot process (where the Fedora teardrop/speech-bubble is nearly full), the laptop's backlight turns off. At this point the laptop becomes useless. Almost nothing I try will cause the backlight to come back on; not mouse or keyboard activity, or Alt_Ctl-F<n>, nor suspending, rebooting etc. (Well, rebooting gets the backlight on again during the early part of the reboot, then it turns off again as before.) The only way I managed to get it back on again was ssh-ing in from another host and messing about with xrandr and xbacklight.
As regards the immediate resume after suspend, /var/log/messages shows that both the suspend and the immediate resume are actually happening (as opposed to it just not attempting to suspend, say):
Mar 31 11:30:34 robin kernel: [ 54.250729] smpboot: CPU 7 is now offline Mar 31 11:30:34 robin kernel: [ 54.252183] ACPI: Low-level resume complete Mar 31 11:30:34 robin kernel: [ 54.252228] PM: Restoring platform NVS memory Mar 31 11:30:34 robin kernel: [ 54.253848] microcode: CPU0 sig=0x306a9, pf=0x10, revision=0x19 Mar 31 11:30:34 robin kernel: [ 54.253868] Enabling non-boot CPUs ... Mar 31 11:30:34 robin kernel: [ 54.253909] x86: Booting SMP configuration:
The only untowards thing I can find in /var/log/messages is:
Apr 1 11:05:31 robin kernel: [80684.720042] ACPI Warning: _SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Apr 1 11:05:31 robin kernel: [80684.720198] ACPI Warning: _SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Apr 1 11:05:31 robin kernel: ACPI Warning: _SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95) Apr 1 11:05:31 robin kernel: ACPI Warning: _SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95)
The graphics are "Intel Ivybridge Mobile". (The laptop has an Nvidia too, but I don't think its being used. And I've certainly never installed the nvidia binary blob thing)