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Enable systemd-baclight@intel_backlight instead of systemd-backlight@acpi_video0

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5

I have 2 files in /sys/class/backlight/ - acpi_video0 and intel_backlight. intel_backlight is the one which controls my screen brightness (echo/cat), however acpi_video0 is the default.

By default the service systemd-backlight@acpi_video0.service is enabled which should save/restore brightness at shutdown/startup, but it doesn't work since it points to the wrong file.

When trying to enable systemd-backlight@intel_backlight.service instead, but I get this message:

The unit files have no [Install] section. They are not meant to be enabled

using systemctl.

Possible reasons for having this kind of units are:

1) A unit may be statically enabled by being symlinked from another unit's

   .wants/ or .requires/ directory.

2) A unit's purpose may be to act as a helper for some other unit which has

   a requirement dependency on it.

3) A unit may be started when needed via activation (socket, path, timer,

   D-Bus, udev, scripted systemctl call, ...).

How do I fix this?

arch-linux systemd

share|improve this question

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

bumped to the homepage by Community♦ 4 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Side question: Is it normal to have two files in /sys/class/backlight/?
  
  – orschiro
  Apr 3 '14 at 6:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't know if it's normal but I have 2 dirs there on my laptop on default install.
  
  – Babken Vardanyan
  Apr 3 '14 at 10:07
  

  
  
  
  

add a comment | 

5

I have 2 files in /sys/class/backlight/ - acpi_video0 and intel_backlight. intel_backlight is the one which controls my screen brightness (echo/cat), however acpi_video0 is the default.

By default the service systemd-backlight@acpi_video0.service is enabled which should save/restore brightness at shutdown/startup, but it doesn't work since it points to the wrong file.

When trying to enable systemd-backlight@intel_backlight.service instead, but I get this message:

The unit files have no [Install] section. They are not meant to be enabled

using systemctl.

Possible reasons for having this kind of units are:

1) A unit may be statically enabled by being symlinked from another unit's

   .wants/ or .requires/ directory.

2) A unit's purpose may be to act as a helper for some other unit which has

   a requirement dependency on it.

3) A unit may be started when needed via activation (socket, path, timer,

   D-Bus, udev, scripted systemctl call, ...).

How do I fix this?

arch-linux systemd

share|improve this question

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

bumped to the homepage by Community♦ 4 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Side question: Is it normal to have two files in /sys/class/backlight/?
  
  – orschiro
  Apr 3 '14 at 6:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't know if it's normal but I have 2 dirs there on my laptop on default install.
  
  – Babken Vardanyan
  Apr 3 '14 at 10:07
  

  
  
  
  

add a comment | 

I have 2 files in /sys/class/backlight/ - acpi_video0 and intel_backlight. intel_backlight is the one which controls my screen brightness (echo/cat), however acpi_video0 is the default.

By default the service systemd-backlight@acpi_video0.service is enabled which should save/restore brightness at shutdown/startup, but it doesn't work since it points to the wrong file.

When trying to enable systemd-backlight@intel_backlight.service instead, but I get this message:

The unit files have no [Install] section. They are not meant to be enabled

using systemctl.

Possible reasons for having this kind of units are:

1) A unit may be statically enabled by being symlinked from another unit's

   .wants/ or .requires/ directory.

2) A unit's purpose may be to act as a helper for some other unit which has

   a requirement dependency on it.

3) A unit may be started when needed via activation (socket, path, timer,

   D-Bus, udev, scripted systemctl call, ...).

How do I fix this?

arch-linux systemd

share|improve this question

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

The unit files have no [Install] section. They are not meant to be enabled

using systemctl.

Possible reasons for having this kind of units are:

1) A unit may be statically enabled by being symlinked from another unit's

   .wants/ or .requires/ directory.

2) A unit's purpose may be to act as a helper for some other unit which has

   a requirement dependency on it.

3) A unit may be started when needed via activation (socket, path, timer,

   D-Bus, udev, scripted systemctl call, ...).

share|improve this question

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

share|improve this question

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

asked Jan 25 '14 at 15:57

Babken VardanyanBabken Vardanyan

525715

1 Answer
1

active

oldest

votes

0

It may be that you're just missing the backlight: part of the command:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

You may also need to escape the :, i.e.:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

Since you have two folders in /sys/class/backlight/, you probably have two graphics cards. The Arch wiki suggests adding one of the following kernel parameters in your bootloader:

acpi_backlight=video

acpi_backlight=vendor

acpi_backlight=native

acpi_backlight=none

share|improve this answer

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

add a comment | 

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0

It may be that you're just missing the backlight: part of the command:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

You may also need to escape the :, i.e.:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

Since you have two folders in /sys/class/backlight/, you probably have two graphics cards. The Arch wiki suggests adding one of the following kernel parameters in your bootloader:

acpi_backlight=video

acpi_backlight=vendor

acpi_backlight=native

acpi_backlight=none

share|improve this answer

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

add a comment | 

0

It may be that you're just missing the backlight: part of the command:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

You may also need to escape the :, i.e.:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

Since you have two folders in /sys/class/backlight/, you probably have two graphics cards. The Arch wiki suggests adding one of the following kernel parameters in your bootloader:

acpi_backlight=video

acpi_backlight=vendor

acpi_backlight=native

acpi_backlight=none

share|improve this answer

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

add a comment | 

It may be that you're just missing the backlight: part of the command:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

You may also need to escape the :, i.e.:

# systemctl enable systemd-backlight@backlight:intel_backlight.service

Since you have two folders in /sys/class/backlight/, you probably have two graphics cards. The Arch wiki suggests adding one of the following kernel parameters in your bootloader:

acpi_backlight=video

acpi_backlight=vendor

acpi_backlight=native

acpi_backlight=none

share|improve this answer

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

# systemctl enable systemd-backlight@backlight:intel_backlight.service

# systemctl enable systemd-backlight@backlight:intel_backlight.service

acpi_backlight=video

acpi_backlight=vendor

acpi_backlight=native

acpi_backlight=none

share|improve this answer

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738

answered Nov 1 '15 at 20:21

David KennedyDavid Kennedy

96581738