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[Helge <580225@xxxxxxxxxxxxxxxxxx>]

Setting SAVE_VIDEO_PCI_STATE=true in /etc/default/acpi-support did note solve the problem - it happened again today.
Once the screen goes buggy after resume, I can't do anything to turn the light back on.

I tried all pm-suspend quirks.
Hibernating brings the screen back on during boot-up, but as soon as I get to the resumed desktop it's off again.
Switching to console (Ctrl+Alt+F1) and back doesn't bring the light on at any moment.

The only way to get the light back on is with a full reboot.
Must be a bug with the Intel driver then...?

Maybe I should turn off kernel-mode setting and try the console-switch
method next time it happens?

If anyone knows anything I can try, please let me know.

-- 
[gm45] Backlight sometimes stays off after resume on Lenovo X200
https://bugs.launchpad.net/bugs/580225
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