As of today, Jan 5, 2017, 375.26 *is* now in the Ubuntu repositories,
and it does indeed solve this backlight problem.
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https://bugs.launchpad.net/bugs/1631191
Title:
Display backlight
I too can confirm this. I've the same machine (XPS l702x aka XPS 17),
display (hd 3D), and graphics card (GT 555m). Same results on each of
the above suggested tests. All indications (OSD, /proc values, g-p-m
output) are that the brightness is changing, but the actual screen does
not change.
