[Regression] 4.3.0rc4 through rc7: No LCD backlight on Thinkpad T60P

[Simon Wood]

> Well, I can confirm that the patch stopped the Oops - but unfortunatly
> the screen is still dark.
>
> Also, Oops _does_ happen with rc2 but the screens is OK with that... Back
> to looking through the logs.

I couldn't see anything of note in the syslog, so attempted to bisect the
problem some - although building takes considerable time on this machine
(note 32bit).

4.3.0rc6 - bad
4.3.0rc7 - bad
4.3.0rc2 - good
4.3.0rc4 - bad (049e6dde7e57f0054fdc49102e7ef4830c698b46)
4.3.0rc3 - good (9ffecb10283508260936b96022d4ee43a7798b4c)

So problem (no LCD backlight) must have been introduced between those.
Simon

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