Description of problem:
Suspend does not work out of the box on the chromebook Acer C720P

Version-Release number of selected component (if applicable):
Fedora 21

How reproducible:
Always

Steps to Reproduce:
1. Buy an Acer C720P ;-)
2. Install the firmware by John Lewis: http://johnlewis.ie/
3. Install Fedora 21
4. Boot into F21
5. Close the Lid

Actual results:
The computer does not go to suspend

Expected results:
The computer should go to suspend

Additional info:
There is a proposed hack to have suspend working with F21:
http://forums.fedora-fr.org/viewtopic.php?id=61252
I copy below a translation of it.
It does indeed allow to suspend, albeit at wake up, I loose the sound of google-chrome or epiphany if there are playing youtube video. I have to restart them.
So I am asking:
- if the hacks proposed or some other working solution could be incorporated into Fedora
- if there is a way to keep the sound working on youtube videos after a wake up

-----------------------------------------------

1) Create the /etc/tmpfiles.d/cros-acpi-wakeup.conf file:

# /etc/tmpfiles.d/cros-acpi-wakeup.conf
w /proc/acpi/wakeup - - - - EHCI
w /proc/acpi/wakeup - - - - HDEF
w /proc/acpi/wakeup - - - - XHCI
w /proc/acpi/wakeup - - - - LID0
w /proc/acpi/wakeup - - - - TPAD
w /proc/acpi/wakeup - - - - TSCR
On crée le fichier /usr/lib/systemd/system-sleep/cros-sound-suspend.sh
#!/bin/bash
case $1/$2 in
  pre/*)
    # Kill flash plugin as it prevent suspend
    pgrep -f flashplayer | xargs kill >/dev/null 2>&1
    # Unbind ehci for preventing error 
    echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci-pci/unbind
    # Unbind snd_hda_intel for sound
    echo -n "0000:00:1b.0" | tee /sys/bus/pci/drivers/snd_hda_intel/unbind
    echo -n "0000:00:03.0" | tee /sys/bus/pci/drivers/snd_hda_intel/unbind
    ;;
  post/*)
    # Bind ehci for preventing error 
    echo -n "0000:00:1d.0" | tee /sys/bus/pci/drivers/ehci-pci/bind
    # bind snd_hda_intel for sound
    echo -n "0000:00:1b.0" | tee /sys/bus/pci/drivers/snd_hda_intel/bind
    echo -n "0000:00:03.0" | tee /sys/bus/pci/drivers/snd_hda_intel/bind
    ;;
esac

2) Make the file executable:
# chmod +x /usr/lib/systemd/system-sleep/cros-sound-suspend.sh

3) Edit GRUB file /etc/default/grub, and add this line at the end:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash tpm_tis.force=1 tpm_tis.interrupts=0"

4) Update grub:
# grub2-mkconfig -o /boot/grub2/grub.cfg

5) Reboot.