[systemd-bugs] [Bug 78200] 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 #1 from Mike C <mike.cloaked at gmail.com> ---
After update to kernel 3.14.2-1-ARCH the corresponding section of the journal
is:

May 02 20:32:34 samsung1 systemd[1]: Starting
system-systemd\x2dbacklight.slice.
May 02 20:32:34 samsung1 systemd[1]: Created slice
system-systemd\x2dbacklight.slice.
May 02 20:32:34 samsung1 systemd[1]: Starting Load/Save Screen Backlight
Brightness of backlight:intel_backlight...
May 02 20:32:35 samsung1 kernel: microcode: CPU1 sig=0x6e8, pf=0x20,
revision=0x39
May 02 20:32:35 samsung1 kernel: microcode: Microcode Update Driver: v2.00
<tigran at aivazian.fsnet.co.uk>, Peter Oruba
May 02 20:32:35 samsung1 kernel: psmouse serio4: synaptics: Touchpad model: 1,
fw: 6.2, id: 0x25a0b1, caps: 0xa04713/0x200000/0x0, board
May 02 20:32:35 samsung1 kernel: input: SynPS/2 Synaptics TouchPad as
/devices/platform/i8042/serio4/input/input16
May 02 20:32:35 samsung1 kernel: mousedev: PS/2 mouse device common for all
mice
May 02 20:32:35 samsung1 systemd[1]: Started Load/Save RF Kill Switch Status of
rfkill0.
May 02 20:32:35 samsung1 systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:intel_backlight.

The screen dims to an unusable, but not quite black, level during the early
phases of boot.

If I use the Fn+up arrow key clicked once only the brightness returns to full
but a short time later it dims again when the login screen for KDE is
presented. I can use the keyboard to again return the brightness to full, and
can then login to KDE. At the point where KDE is logged in the screen again
dims to unusable, but I can still use the keyboard to set the brightness up
again.

I have systemd as a mkinitcpio hook, and I will replace that with udev and base
and see if that makes any difference.

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