The brightness is saved across reboots when using the kernel provided by
package linux-image-4.0.0-2-amd64, which is currently in unstable.
Unfortunately, due to other regressions, I was forced back to
linux-image-3.16.0-4-amd64, which is currently in testing, and now
brightness is not saved across
When I set the brightness manually, I run the following and see:
$ ls -1 /sys/class/backlight/*/*brightness | xargs -I % sh -c "echo % ;
cat %"
/sys/class/backlight/intel_backlight/actual_brightness
2219
/sys/class/backlight/intel_backlight/brightness
2219
/sys/class/backlight/intel_backlight/max
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