I believe this issue is related to your video driver reenabling the
backlight as it is suspending with X.  This happens to me with the
closed-source nVidia driver, but not nv.

Do you have nVidia graphics?  Does it behave differently with the
different drivers?

Thanks.

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Closing the lid does not switch off backlight (Dell Latitude X1)
https://bugs.launchpad.net/bugs/30802
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