I followed hedgefighter's solution in #28 (which is really just the
first part of James Keating's solution in comment #26). The addition of
'i915.modeset=0 nomodeset' to my kernel parameters eliminates the no-
backlight-upon-resume problem for me.
system.firmware.release_date = '02/03/2004'  (string)
system.firmware.vendor = 'IBM'  (string)
system.firmware.version = '1UET63WW (1.14 )'  (string)
system.hardware.primary_video.product = 13698  (0x3582)  (int)
system.hardware.primary_video.vendor = 32902  (0x8086)  (int)
system.hardware.product = '23718EU'  (string)

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pm-suspend with quirks does not restore backlight anymore
https://bugs.launchpad.net/bugs/417599
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