[systemd-bugs] [Bug 78200] New: 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

          Priority: medium
            Bug ID: 78200
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Backlight too dim to use from kernel 3.14 and systemd
                    error
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mike.cloaked at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Since kernel 3.14 was released to arch linux in my Samsung Q35 laptop the boot
starts with normal screen brightness but when X starts it dims to a level where
the screen is unusable.  The brightness can be restored using the keyboard key
combinations.  

I reverted to kernel 3.13.7-1-ARCH and the screen brightness seemed normal but
an investigation of the systemd journal showed there were errors that are
relevant to this issue:

May 02 17:08:49 samsung1 systemd[1]: Starting Load/Save Screen Backlight
Brightness of backlight:intel_backlight...
May 02 17:08:49 samsung1 systemd-backlight[191]: Failed to write system
attribute: Invalid argument
May 02 17:08:49 samsung1 systemd[1]:
systemd-backlight at backlight:intel_backlight.service: main process exited,
code=exited, status=1/FAI
May 02 17:08:49 samsung1 systemd[1]: Failed to start Load/Save Screen Backlight
Brightness of backlight:intel_backlight.
May 02 17:08:49 samsung1 systemd[1]: Unit
systemd-backlight at backlight:intel_backlight.service entered failed state.


# lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and
945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML
Express Integrated Graphics Controller (rev 03)
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio
Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 1 (rev
02)
00:1c.1 PCI bridge: Intel Corporation NM10/ICH7 Family PCI Express Port 2 (rev
02)
00:1d.0 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller
#1 (rev 02)
00:1d.1 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller
#2 (rev 02)
00:1d.2 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller
#3 (rev 02)
00:1d.3 USB controller: Intel Corporation NM10/ICH7 Family USB UHCI Controller
#4 (rev 02)
00:1d.7 USB controller: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller
(rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge
(rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller
(rev 02)
00:1f.3 SMBus: Intel Corporation NM10/ICH7 Family SMBus Controller (rev 02)
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan]
Network Connection (rev 02)
05:05.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev
02)
05:09.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b4)
05:09.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 09)
05:09.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host
Adapter (rev 18)
05:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter
(rev 09)
05:09.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 04)

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