Comment # 25 on bug 1180749 from
OK, then you're hitting multiple issues, as it seems.

The inconsistent value read from sysfs was addressed by my patch.  But, I
suppose that the main reason of the non-functional backlight is that the driver
misdetected the backlight control over aux.

I refreshed again the KMP with a hack patch to disable the aux support.  Please
give it a try later again.  This will show a line "XXX ext_caps=0x..." in
kernel log.

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