I'm also seeing this on Hardy with 64-bit kernel 2.6.24-2.4 on a
Thinkpad X61s.
Neither the acpi_sleep nor the POST_VIDEO suggestions work for me, but I
can get the backlight back by switching to another VT (e.g. with
Ctrl+Alt+F6) and then back.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Gutsy Tribe 5: Backlight does not come back on after resuming from suspend
https://bugs.launchpad.net/bugs/134391
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