Switch to a text console and back does switch the backlight on. In gutsy
it happened automatically, for the Thinkpad X61 at least, by using the
fix in
http://www.thinkwiki.org/wiki/Problem_with_display_remaining_black_after_resume:
By setting the following in /etc/default/acpi-support the display
comes back on X61s using Intel chipset:
DOUBLE_CONSOLE_SWITCH=true
This does not work after upgrading to hardy.
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Backlight doesn't turn on after resume
https://bugs.launchpad.net/bugs/189260
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