Brightness keys don't work on HP Elitebook Folio 1040 G1

[Jonathan Davies]

The brightness keys (F9, F10) don't work on HP Elitebook Folio 1040 G1. The keyboard backlight key at F11 works fine though.

Known workaround (2014-04-06): Use "acpi_backlight=vendor"/3.13.x+ series kernel use: "video.use_native_backlight=1 as a boot option.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-23-generic 3.13.0-23.45 [modified: boot/vmlinuz-3.13.0-23-generic]
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: jpds 3933 F.... pulseaudio
 /dev/snd/controlC0: jpds 3933 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Apr 6 18:37:24 2014
HibernationDevice: RESUME=UUID=05490d4c-6800-46a1-b5ba-8b32bdc57e89
InstallationDate: Installed on 2014-04-06 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140406)
MachineType: Hewlett-Packard HP EliteBook Folio 1040 G1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-23-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-23-generic N/A
 linux-backports-modules-3.13.0-23-generic N/A
 linux-firmware 1.127
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/09/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L83 Ver. 01.05
dmi.board.name: 213E
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 24.2A
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL83Ver.01.05:bd02/09/2014:svnHewlett-Packard:pnHPEliteBookFolio1040G1:pvrA3009DD18303:rvnHewlett-Packard:rn213E:rvrKBCVersion24.2A:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook Folio 1040 G1
dmi.product.version: A3009DD18303
dmi.sys.vendor: Hewlett-Packard

[Brad Figg (brad-figg)]

This change was made by a bot.

[Jonathan Davies (jpds)]

Collected above per: https://wiki.ubuntu.com/Kernel/Debugging/Backlight

[Jonathan Davies (jpds)]

Using acpi_backlight=vendor as a boot option makes the function keys work.

[Jonathan Davies (jpds)]

Executing:

# echo 8 > /sys/class/backlight/intel_backlight/brightness

...makes the screen VERY dark but still slightly viewable.

[Jonathan Davies (jpds)]

Removed kernel option "acpi_backlight=vendor" and added: "video.use_bios_initial_backlight=0".

System is unable to change brightness at all (hotkeys or a brightness applet) - though this is a EFI system.

[Jonathan Davies (jpds)]

Using 3.13.x+ series kernel, rebooted with just kernel parameter "video.use_native_backlight=1" → brightness can be changed with both methods.

[Andy Whitcroft (apw)]

Ok I have identified a possible fix, one which adds a quirk table, and obliquely references models similar to yours. Could you test this kernel and report back here:

    http://people.canonical.com/~apw/lp1303419-trusty/

[Jonathan Davies (jpds)]

Above kernel fixes the issue for me.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-24.46

---------------
linux (3.13.0-24.46) trusty; urgency=low

  [ Andy Whitcroft ]

  * [Config] d-i -- add nvme devices to block-modules udeb
    - LP: #1303710

  [ Paolo Pisati ]

  * [Config] build vexpress a9 dtb
    - LP: #1303657
  * [Config] disable HVC_DCC
    - LP: #1303657

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1305158
  * rebase to v3.13.9
  * CONFIG_RTLBTCOEXIST=m
    - LP: #1296591

  [ Upstream Kernel Changes ]

  * HID: Bluetooth: hidp: make sure input buffers are big enough
    - LP: #1252874
  * ACPI / video: Add systems that should favour native backlight interface
    - LP: #1303419
  * rds: prevent dereference of a NULL device in rds_iw_laddr_check
    - LP: #1302222
    - CVE-2014-2678
  * x86/efi: Fix 32-bit fallout
    - LP: #1301590
  * drm/nouveau/devinit: tidy up the subdev class definition
    - LP: #1158689
  * drm/nouveau/device: provide a way for devinit to mark engines as
    disabled
    - LP: #1158689
  * drm/nv50-/devinit: prevent use of engines marked as disabled by
    hw/vbios
    - LP: #1158689
  * rtlwifi: btcoexist: Add new mini driver
    - LP: #1296591
  * rtlwifi: Prepare existing drivers for new driver
    - LP: #1296591
  * rtlwifi: add MSI interrupts mode support
    - LP: #1296591
  * rtlwifi: rtl8188ee: enable MSI interrupts mode
    - LP: #1296591

  [ Upstream Kernel Changes ]

  * rebase to v3.13.9
 -- Tim Gardner <email address hidden> Fri, 04 Apr 2014 09:26:27 -0400