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#1 2015-05-19 15:03:07

queenmedley
Member
From: Busan / S.Korea Busan
Registered: 2005-06-15
Posts: 65

Intel_backlight does not exist.

Cpu is a intel i5-haswell and GPU is HD4600 (i915 driver) in cpu.
Problem is that can;t control monitor brightness.

 [yy@ggongjji]$ xbacklight 
No outputs have backlight property

Wiki say when use intel GPU, there should be intel_backlight in /sys/class/backlight folder.
But there is only /sys/class/backlight/acpi_video0
acpi_video0 is linked to /sys/devices/pci0000:00/0000:00:02.0.
I think the pci 00:02 means intel driver. but i don;t know why link to acpi_video0.

 
[yy@ggongjji 0000:00:02.0]$ ls


boot_vga                  enable         local_cpus  resource2
broken_parity_status      firmware_node  modalias    resource2_wc
class                     graphics       msi_bus     resource4
config                    i2c-0          msi_irqs    rom
consistent_dma_mask_bits  i2c-1          numa_node   subsystem
d3cold_allowed            i2c-2          power       subsystem_device
device                    i2c-3          remove      subsystem_vendor
dma_mask_bits             i2c-4          rescan      uevent
driver                    i2c-5          reset       vendor
driver_override           irq            resource
drm                       local_cpulist  resource0

When I try boot option, "acpi_backlight=vendor," there is nothing in /sys/class/backlight folder.
And other boot option are useless.
How can I made intel_backlight in /sys/class/backlight folder??

Last edited by queenmedley (2015-05-19 18:08:45)


- Queen Medley

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#2 2015-05-19 15:48:50

Raynman
Member
Registered: 2011-10-22
Posts: 1,539

Re: Intel_backlight does not exist.

Are you trying to control the brightness of an external monitor? Because that doesn't usually work like this; you have to use the buttons on the monitor. Alternatively you can use xrandr's --brightness option to get a similar effect (and there are probably other tools, perhaps with GUIs).

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#3 2015-05-19 16:48:57

WorMzy
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From: Scotland
Registered: 2010-06-16
Posts: 11,787
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Re: Intel_backlight does not exist.

Queenmedley, please use code tags, rather than quote tags, for terminal output -- it uses a monospaced font and and makes it easier to read. Thanks.


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#4 2015-05-19 16:59:33

queenmedley
Member
From: Busan / S.Korea Busan
Registered: 2005-06-15
Posts: 65

Re: Intel_backlight does not exist.

WorMzy wrote:

Queenmedley, please use code tags, rather than quote tags, for terminal output -- it uses a monospaced font and and makes it easier to read. Thanks.

Oh.. sorry. I just fixed it. Thanks.


- Queen Medley

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#5 2015-05-19 18:04:05

queenmedley
Member
From: Busan / S.Korea Busan
Registered: 2005-06-15
Posts: 65

Re: Intel_backlight does not exist.

Raynman wrote:

Are you trying to control the brightness of an external monitor? Because that doesn't usually work like this; you have to use the buttons on the monitor. Alternatively you can use xrandr's --brightness option to get a similar effect (and there are probably other tools, perhaps with GUIs).

Yes. I have LG LED monitor. I can control the brightness through an external monitor button and also xrandr brightness option.
But using monitor button is quite annoying.
Xrandr is diffrent from xbacklight and it seems to change color more white, not brightness..

Last edited by queenmedley (2015-05-19 18:06:25)


- Queen Medley

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#6 2015-05-19 20:40:33

Head_on_a_Stick
Member
From: London
Registered: 2014-02-20
Posts: 7,680
Website

Re: Intel_backlight does not exist.

Strange -- I have an i5-4330M & HD4600 and `xbacklight` works fine and I have /sys/class/backlight/intel_backlight hmm

Do you have any kernel parameters loaded?

cat /proc/cmdline

You could try this kernel parameter:

video.use_native_backlight=1

https://wiki.archlinux.org/index.php/Ba … ne_options

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#7 2015-05-20 13:30:38

queenmedley
Member
From: Busan / S.Korea Busan
Registered: 2005-06-15
Posts: 65

Re: Intel_backlight does not exist.

Head_on_a_Stick wrote:

Strange -- I have an i5-4330M & HD4600 and `xbacklight` works fine and I have /sys/class/backlight/intel_backlight hmm

Do you have any kernel parameters loaded?

cat /proc/cmdline

You could try this kernel parameter:

video.use_native_backlight=1

https://wiki.archlinux.org/index.php/Ba … ne_options

I tryed several options, video.use_native_backlight=1 or 0, acpi_osi="!Windows 2012",  acpi_backlight=vendor....
All are failed.

My computer is normal desktop, and monitor is connected with HDMI cable..
I wonder it is impossible to control brightness on destktop computer
and xbacklight command and intel_backlight in /sys/class/backlight are available only labtop or notebook..


- Queen Medley

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#8 2015-05-20 13:39:08

queenmedley
Member
From: Busan / S.Korea Busan
Registered: 2005-06-15
Posts: 65

Re: Intel_backlight does not exist.

I checked i915 module .. but I don;t understand what it means..
Anyone help..?

[yy@ggongjji ~]$ modinfo i915
filename:       /lib/modules/4.0.1-1-ARCH/kernel/drivers/gpu/drm/i915/i915.ko.gz
license:        GPL and additional rights
description:    Intel Graphics
author:         Intel Corporation
author:         Tungsten Graphics, Inc.
alias:          pci:v00008086d0000191Dsv*sd*bc03sc*i*
alias:          pci:v00008086d0000190Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000192Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000191Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000190Bsv*sd*bc03sc*i*
alias:          pci:v00008086d0000192Bsv*sd*bc03sc*i*
alias:          pci:v00008086d0000191Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00001902sv*sd*bc03sc*i*
alias:          pci:v00008086d00001912sv*sd*bc03sc*i*
alias:          pci:v00008086d0000191Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000190Esv*sd*bc03sc*i*
alias:          pci:v00008086d00001921sv*sd*bc03sc*i*
alias:          pci:v00008086d00001926sv*sd*bc03sc*i*
alias:          pci:v00008086d00001906sv*sd*bc03sc*i*
alias:          pci:v00008086d00001916sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B3sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B2sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B1sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B0sv*sd*bc03sc*i*
alias:          pci:v00008086d0000162Dsv*sd*bc03sc*i*
alias:          pci:v00008086d0000162Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000162Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000162Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00001626sv*sd*bc03sc*i*
alias:          pci:v00008086d00001622sv*sd*bc03sc*i*
alias:          pci:v00008086d0000161Dsv*sd*bc03sc*i*
alias:          pci:v00008086d0000161Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000160Dsv*sd*bc03sc*i*
alias:          pci:v00008086d0000160Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000161Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000161Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00001616sv*sd*bc03sc*i*
alias:          pci:v00008086d00001612sv*sd*bc03sc*i*
alias:          pci:v00008086d0000160Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000160Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00001606sv*sd*bc03sc*i*
alias:          pci:v00008086d00001602sv*sd*bc03sc*i*
alias:          pci:v00008086d00000155sv*sd*bc03sc*i*
alias:          pci:v00008086d00000157sv*sd*bc03sc*i*
alias:          pci:v00008086d00000F33sv*sd*bc03sc*i*
alias:          pci:v00008086d00000F32sv*sd*bc03sc*i*
alias:          pci:v00008086d00000F31sv*sd*bc03sc*i*
alias:          pci:v00008086d00000F30sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D26sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D16sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D06sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A2Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000A1Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000A0Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000A26sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A16sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A06sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C26sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C16sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C06sv*sd*bc03sc*i*
alias:          pci:v00008086d00000426sv*sd*bc03sc*i*
alias:          pci:v00008086d00000416sv*sd*bc03sc*i*
alias:          pci:v00008086d00000406sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D2Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000D1Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000D0Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000D2Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000D1Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000D0Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000D2Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000D1Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000D0Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000D22sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D12sv*sd*bc03sc*i*
alias:          pci:v00008086d00000D02sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A2Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000A1Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000A0Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000A2Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000A1Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000A0Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000A22sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A12sv*sd*bc03sc*i*
alias:          pci:v00008086d00000A02sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C2Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000C1Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000C0Esv*sd*bc03sc*i*
alias:          pci:v00008086d00000C2Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000C1Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000C0Bsv*sd*bc03sc*i*
alias:          pci:v00008086d00000C2Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000C1Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000C0Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000C22sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C12sv*sd*bc03sc*i*
alias:          pci:v00008086d00000C02sv*sd*bc03sc*i*
alias:          pci:v00008086d0000042Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000041Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000040Esv*sd*bc03sc*i*
alias:          pci:v00008086d0000042Bsv*sd*bc03sc*i*
alias:          pci:v00008086d0000041Bsv*sd*bc03sc*i*
alias:          pci:v00008086d0000040Bsv*sd*bc03sc*i*
alias:          pci:v00008086d0000042Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000041Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000040Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000422sv*sd*bc03sc*i*
alias:          pci:v00008086d00000412sv*sd*bc03sc*i*
alias:          pci:v00008086d00000402sv*sd*bc03sc*i*
alias:          pci:v00008086d0000016Asv*sd*bc03sc*i*
alias:          pci:v00008086d0000015Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000162sv*sd*bc03sc*i*
alias:          pci:v00008086d00000152sv*sd*bc03sc*i*
alias:          pci:v00008086d00000166sv*sd*bc03sc*i*
alias:          pci:v00008086d00000156sv*sd*bc03sc*i*
alias:          pci:v00008086d0000016Asv0000152Dsd00008990bc03sc*i*
alias:          pci:v00008086d00000126sv*sd*bc03sc*i*
alias:          pci:v00008086d00000116sv*sd*bc03sc*i*
alias:          pci:v00008086d00000106sv*sd*bc03sc*i*
alias:          pci:v00008086d0000010Asv*sd*bc03sc*i*
alias:          pci:v00008086d00000122sv*sd*bc03sc*i*
alias:          pci:v00008086d00000112sv*sd*bc03sc*i*
alias:          pci:v00008086d00000102sv*sd*bc03sc*i*
alias:          pci:v00008086d00000046sv*sd*bc03sc*i*
alias:          pci:v00008086d00000042sv*sd*bc03sc*i*
alias:          pci:v00008086d0000A011sv*sd*bc03sc*i*
alias:          pci:v00008086d0000A001sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E92sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E42sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E32sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E22sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E12sv*sd*bc03sc*i*
alias:          pci:v00008086d00002E02sv*sd*bc03sc*i*
alias:          pci:v00008086d00002A42sv*sd*bc03sc*i*
alias:          pci:v00008086d00002A12sv*sd*bc03sc*i*
alias:          pci:v00008086d00002A02sv*sd*bc03sc*i*
alias:          pci:v00008086d000029D2sv*sd*bc03sc*i*
alias:          pci:v00008086d000029C2sv*sd*bc03sc*i*
alias:          pci:v00008086d000029B2sv*sd*bc03sc*i*
alias:          pci:v00008086d000029A2sv*sd*bc03sc*i*
alias:          pci:v00008086d00002992sv*sd*bc03sc*i*
alias:          pci:v00008086d00002982sv*sd*bc03sc*i*
alias:          pci:v00008086d00002972sv*sd*bc03sc*i*
alias:          pci:v00008086d000027AEsv*sd*bc03sc*i*
alias:          pci:v00008086d000027A2sv*sd*bc03sc*i*
alias:          pci:v00008086d00002772sv*sd*bc03sc*i*
alias:          pci:v00008086d00002592sv*sd*bc03sc*i*
alias:          pci:v00008086d0000258Asv*sd*bc03sc*i*
alias:          pci:v00008086d00002582sv*sd*bc03sc*i*
alias:          pci:v00008086d00002572sv*sd*bc03sc*i*
alias:          pci:v00008086d0000358Esv*sd*bc03sc*i*
alias:          pci:v00008086d00003582sv*sd*bc03sc*i*
alias:          pci:v00008086d00002562sv*sd*bc03sc*i*
alias:          pci:v00008086d00003577sv*sd*bc03sc*i*
depends:        drm_kms_helper,drm,intel-gtt,i2c-core,video,button,i2c-algo-bit
intree:         Y
vermagic:       4.0.1-1-ARCH SMP preempt mod_unload modversions 
parm:           modeset:Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, 1=on, -1=force vga console preference [default]) (int)
parm:           panel_ignore_lid:Override lid status (0=autodetect, 1=autodetect disabled [default], -1=force lid closed, -2=force lid open) (int)
parm:           powersave:Enable powersavings, fbc, downclocking, etc. (default: true) (int)
parm:           semaphores:Use semaphores for inter-ring sync (default: -1 (use per-chip defaults)) (int)
parm:           enable_rc6:Enable power-saving render C-state 6. Different stages can be selected via bitmask values (0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. default: -1 (use per-chip default) (int)
parm:           enable_fbc:Enable frame buffer compression for power savings (default: -1 (use per-chip default)) (int)
parm:           lvds_downclock:Use panel (LVDS/eDP) downclocking for power savings (default: false) (int)
parm:           lvds_channel_mode:Specify LVDS channel mode (0=probe BIOS [default], 1=single-channel, 2=dual-channel) (int)
parm:           lvds_use_ssc:Use Spread Spectrum Clock with panels [LVDS/eDP] (default: auto from VBT) (int)
parm:           vbt_sdvo_panel_type:Override/Ignore selection of SDVO panel mode in the VBT (-2=ignore, -1=auto [default], index in VBT BIOS table) (int)
parm:           reset:Attempt GPU resets (default: true) (bool)
parm:           enable_hangcheck:Periodically check GPU activity for detecting hangs. WARNING: Disabling this can cause system wide hangs. (default: true) (bool)
parm:           enable_ppgtt:Override PPGTT usage. (-1=auto [default], 0=disabled, 1=aliasing, 2=full) (int)
parm:           enable_execlists:Override execlists usage. (-1=auto [default], 0=disabled, 1=enabled) (int)
parm:           enable_psr:Enable PSR (default: false) (int)
parm:           preliminary_hw_support:Enable preliminary hardware support. (int)
parm:           disable_power_well:Disable the power well when possible (default: true) (int)
parm:           enable_ips:Enable IPS (default: true) (int)
parm:           fastboot:Try to skip unnecessary mode sets at boot time (default: false) (bool)
parm:           prefault_disable:Disable page prefaulting for pread/pwrite/reloc (default:false). For developers only. (bool)
parm:           invert_brightness:Invert backlight brightness (-1 force normal, 0 machine defaults, 1 force inversion), please report PCI device ID, subsystem vendor and subsystem device ID to dri-devel@lists.freedesktop.org, if your machine needs it. It will then be included in an upcoming module version. (int)
parm:           disable_display:Disable display (default: false) (bool)
parm:           disable_vtd_wa:Disable all VT-d workarounds (default: false) (bool)
parm:           enable_cmd_parser:Enable command parsing (1=enabled [default], 0=disabled) (int)
parm:           use_mmio_flip:use MMIO flips (-1=never, 0=driver discretion [default], 1=always) (int)
parm:           mmio_debug:Enable the MMIO debug code (default: false). This may negatively affect performance. (bool)
parm:           verbose_state_checks:Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions. (bool)
parm:           nuclear_pageflip:Force atomic modeset functionality; only planes work for now (default: false). (bool)

- Queen Medley

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#9 2015-05-20 20:29:37

Head_on_a_Stick
Member
From: London
Registered: 2014-02-20
Posts: 7,680
Website

Re: Intel_backlight does not exist.

queenmedley wrote:

I wonder it is impossible to control brightness on destktop computer
and xbacklight command and intel_backlight in /sys/class/backlight are available only labtop or notebook..

^ This.

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