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I'm posting this for the record, in case anyone have the same problem.
The recent Xorg major upgrade got me into quite some troubles. At first, X stopped working and completely freezed my computer. I got it solved by activating the Kernel Mode Settings.
But then, the sleep mode stopped working : at resume time, the computer behaves normally but the backlight of the screen stays off. It was not the first time I had this problem. The usual fix was to add acpi_sleep=s3_bios in the kernel boot line in grub's config file.
None of the pm-suspend quirks worked for me.
"sudo vbetool post" turned on the screen, but not in the right "mode" or whatever, thus rendering the screen unusable.
For those who don't want to read, the solution
sudo pacman -S uswsusps2ram works perfectly.
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You can also use uswsusp as backend for pm-utils (instead of the kernel one).
$ cat /etc/pm/config.d/module
SLEEP_MODULE=uswsusp
$
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