hi, I know what's the problem. for some reason my patch is different from the last deb...
instead of prefix it should be prefix_outof... this is what I mean:

-      <match key="system.hardware.product" prefix="2672">
+ <match key="system.hardware.product" prefix_outof="2672;2673">
of course leave your specific model 28844 if needed...
(never seen a thinkpad with a 5 digit prefix)
hope it solves your problem!
marco

On Fri, Apr 4, 2008 at 4:03 PM, Jonathan Corbet <corbet-s-launchpad@lwn.net> wrote:
No joy.  Same behavior as before: the backlight does indeed go off, but
comes back on at the very last moment as the machine suspends.

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[Hardy] Thinkpad X31 (ATI Radeon M6) suspend backlight on
https://bugs.launchpad.net/bugs/199059
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