F20: fail to suspend with ext monitor, and backlight off

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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)

-- 
Never do today what you can put off till tomorrow.
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