[Bug 78200] [regression] Backlight too dim to use from kernel 3.14 and systemd error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78200

--- Comment #12 from Mike C <mike.cloaked at gmail.com> ---
There was a single file in /var/lib/systemd/backlight/ which I deleted - on
rebooting the symptoms were the same as before, and the file was recreated.

I also booted with systemd.restore_state=0 on the kernel line, and this did
make a difference in that the brightness then remained full until and including
when the KDM login greeter was on the screen, but once I entered the user
password the screen then dimmed, as before, between entering the login details
and the user being logged in to the KDE desktop. Again using the keyboard Fn+up
arrow just once restores the brightness.

There was a boot error on the screen during this test with the systemd failure
to save/restore but it went past quickly so I will attach the journal log
shortly soon after the boot and login.

This was with kernel 3.14.2-1-ARCH.  I had previously built kernel 3.15rc3-1
and tested on the same laptop but it made no difference to the screen dimming
issue. (It takes over three hours to build a kernel on that machine and I have
no other 32 bit machine to run builds for that architecture.)  So unless there
has been commits that might provide a fix since rc3 then I guess that this
issue remains unresolved.

I am still not clear if this is a kernel issue or a systemd issue? However the
same version of systemd gave a working system for the earlier 3.13 kernels and
a broken system with 3.14 and 3.15 so maybe the answer lies in the kernel?

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