Comment # 25 on bug 810133 from Olav Reinert

(In reply to Takashi Iwai from comment #24)
> The light off behavior must be from BIOS, as now the kernel has no control
> at all.

Agreed. I just mention it for info.

> And, now try to rmmod only i915 module but keeping button module (and don't
> forget to boot with nomodeset option), and check the lid behavior again.  Is
> it same behavior like the previous test?  Or system reacts for the action
> you defined?

In this case, the system reacts according to the action defined in logind.conf.
Multiple sleep/resume cycles works reliably.