The background-size property specifies the size of the background image.

The background-size property specifies the size of the background images. There are three keywords you can use with this property: auto: The background image is displayed in its original size; cover: Resize the background image to cover the entire container, even if it has to stretch the image or cut a little bit off one of the edges; contain: Resize the background image to make sure the image is fully visible. It overrides the value defined in the default style sheet.

- Type: dconf
- Key: /com/ubuntu/login-screen/background-size
- Default: 'default'

Note: default system value is used for "Not Configured" and enforced if "Disabled".

Supported on Ubuntu 20.04, 22.04, 22.10.

Supported on: Ubuntu

Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
Value NamemetaValues
Value TypeREG_SZ
Enabled Value{"20.04":{"empty":"''","meta":"s"},"22.04":{"empty":"''","meta":"s"},"22.10":{"empty":"''","meta":"s"},"all":{"empty":"''","meta":"s"}}
Disabled Value{"20.04":{"meta":"s"},"22.04":{"meta":"s"},"22.10":{"meta":"s"},"all":{"meta":"s"}}

The background-size property specifies the size of the background image.


  1. default
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Nameall
    Value TypeREG_SZ
    Valuedefault
  2. auto
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Nameall
    Value TypeREG_SZ
    Valueauto
  3. cover
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Nameall
    Value TypeREG_SZ
    Valuecover
  4. contain
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Nameall
    Value TypeREG_SZ
    Valuecontain

Override value for 22.10:
Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
Value NameOverride22.10
Value TypeREG_SZ
Default Valuefalse
True Valuetrue
False Valuefalse



  1. default
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.10
    Value TypeREG_SZ
    Valuedefault
  2. auto
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.10
    Value TypeREG_SZ
    Valueauto
  3. cover
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.10
    Value TypeREG_SZ
    Valuecover
  4. contain
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.10
    Value TypeREG_SZ
    Valuecontain

Override value for 22.04:
Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
Value NameOverride22.04
Value TypeREG_SZ
Default Valuefalse
True Valuetrue
False Valuefalse



  1. default
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.04
    Value TypeREG_SZ
    Valuedefault
  2. auto
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.04
    Value TypeREG_SZ
    Valueauto
  3. cover
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.04
    Value TypeREG_SZ
    Valuecover
  4. contain
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name22.04
    Value TypeREG_SZ
    Valuecontain

Override value for 20.04:
Registry HiveHKEY_LOCAL_MACHINE
Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
Value NameOverride20.04
Value TypeREG_SZ
Default Valuefalse
True Valuetrue
False Valuefalse



  1. default
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name20.04
    Value TypeREG_SZ
    Valuedefault
  2. auto
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name20.04
    Value TypeREG_SZ
    Valueauto
  3. cover
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name20.04
    Value TypeREG_SZ
    Valuecover
  4. contain
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Ubuntu\gdm\dconf\com\ubuntu\login-screen\background-size
    Value Name20.04
    Value TypeREG_SZ
    Valuecontain


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