Backlight - Revision history

Prabuanand: added wikilinks

2025-10-01T15:06:09Z

added wikilinks

← Older revision		Revision as of 15:06, 1 October 2025
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	Use full path to executable and brightness can be adjusted by running: {{Cmd\|/usr/bin/brightnessctl set 100}}		Use full path to executable and brightness can be adjusted by running: {{Cmd\|/usr/bin/brightnessctl set 100}}

	To use <Code>brightnessctl</Code> to control external monitors, the [~~https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux~~] ~~is needed. The relevant~~ {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#~~Testing~~\|testing]] repository~~. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}~~.		To use <Code>brightnessctl</Code> to control external monitors, install the [[Alpine kernel module support‎‎]] based {{Pkg\|ddcci-driver-linux-src}} kernel driver package available in [[Repositories#Using testing repository\|testing]] repository.

	== Ddcutil ==		== Ddcutil ==
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	== See also ==		== See also ==

	* [~~https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website~~]		* [[Power management]]

	[[Category:Power Management]]		[[Category:Power Management]]

Prabuanand: added doas option

2025-07-12T03:47:52Z

added doas option

← Older revision		Revision as of 03:47, 12 July 2025
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	The [https://www.ddcutil.com/ ddcutil] utility available in the {{Pkg\|ddcutil}} package can be used to control brightness in external monitors, if your hardware supports it.		The [https://www.ddcutil.com/ ddcutil] utility available in the {{Pkg\|ddcutil}} package can be used to control brightness in external monitors, if your hardware supports it.

	Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|ddcutil -d 1 getvcp 10}}		Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|$ doas ddcutil -d 1 getvcp 10}}
	To set brightness of your monitor to 50% issue the command: {{Cmd\|ddcutil -d 1 setvcp 10 50}}		To set brightness of your monitor to 50% issue the command: {{Cmd\|$ doas ddcutil -d 1 setvcp 10 50}}

			The following command will provide more information on other parameters that can be controlled with {{ic\|ddcutil}} utility:{{Cmd\|$ doas ddcutil vcpinfo }}

	== Troubleshooting ==		== Troubleshooting ==

	=== No /dev/i2c devices exist ===		=== No /dev/i2c devices exist ===

	The command <Code>ddcutil</Code> may generate the below error:		The command <Code>ddcutil</Code> may generate the below error:
	<Pre>		<Pre>
Line 42:		Line 45:
	ddcutil requires module i2c-dev.		ddcutil requires module i2c-dev.
	</Pre>		</Pre>
	If you receive the above error, on running <Code>ddcutil</Code>, ~~then~~ load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}		If you receive the above error on running <Code>ddcutil</Code>, load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}

	Rebooting the computer after installing {{Pkg\|ddcutil}} should automatically load the above module based on {{Path\|/usr/lib/modules-load.d/ddcutil.conf}}.		Rebooting the computer after installing {{Pkg\|ddcutil}} should automatically load the above module based on {{Path\|/usr/lib/modules-load.d/ddcutil.conf}}.

	== See ~~Also~~ ==		== See also ==

	* [https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website]		* [https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website]

	[[Category:Power Management]]		[[Category:Power Management]]

Prabuanand: removed :Category:Desktop as per Help_talk:Style

2025-05-25T15:40:50Z

removed Category:Desktop as per Help_talk:Style

← Older revision		Revision as of 15:40, 25 May 2025
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	== See Also ==		== See Also ==

	* [https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website ]		* [https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website]
	[[Category:~~Desktop~~]]
			[[Category:Power Management]]

Prabuanand: rephrased sentence

2025-02-25T05:29:53Z

rephrased sentence

← Older revision		Revision as of 05:29, 25 February 2025
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	The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.		The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.

			Since <Code>brightnessctl</Code> requires privilege escalation, allow either the user to be part of wheel group or configure doas to allow running it as an unprivileged user.

	Option 1:		Option 1:
Line 18:		Line 20:

	To enable brightnessctl service:{{Cmd\|# rc-update add brightnessctl}}		To enable brightnessctl service:{{Cmd\|# rc-update add brightnessctl}}

			Use full path to executable and brightness can be adjusted by running: {{Cmd\|/usr/bin/brightnessctl set 100}}

	To use <Code>brightnessctl</Code> to control external monitors, the [https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux] is needed. The relevant {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#Testing\|testing]] repository. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}.		To use <Code>brightnessctl</Code> to control external monitors, the [https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux] is needed. The relevant {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#Testing\|testing]] repository. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}.

Prabuanand: rephrased sentence

2025-02-25T05:23:04Z

rephrased sentence

← Older revision		Revision as of 05:23, 25 February 2025
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	The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.		The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.

	~~[[Setting_up_a_new_user#doas\|Doas]] is used to grant permissions for brightness control with brightnessctl:~~

	Option 1:		Option 1:
	# optionally, allow $USER root access with password		# optionally, allow $USER root access with password
	adduser $USER wheel		adduser $USER wheel

	Option 2:		Option 2:
	In the doas config file {{Path\|/etc/doas.conf}}, set
			[[Setting_up_a_new_user#doas\|Doas]] is used to grant permissions for brightness control with brightnessctl. In the doas config file {{Path\|/etc/doas.conf}}, set

	permit nopass $USER as root cmd /usr/bin/brightnessctl		permit nopass $USER as root cmd /usr/bin/brightnessctl

Prabuanand: added information about doas

2025-02-25T05:21:24Z

added information about doas

← Older revision		Revision as of 05:21, 25 February 2025
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	The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.		The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.

	~~Optionally~~ enable brightnessctl service ~~to restore brightness settings on reboot~~:{{Cmd\|# rc-update add brightnessctl}}		[[Setting_up_a_new_user#doas\|Doas]] is used to grant permissions for brightness control with brightnessctl:

			Option 1:
			# optionally, allow $USER root access with password
			adduser $USER wheel
			Option 2:
			In the doas config file {{Path\|/etc/doas.conf}}, set

			permit nopass $USER as root cmd /usr/bin/brightnessctl

			To enable brightnessctl service:{{Cmd\|# rc-update add brightnessctl}}

	To use <Code>brightnessctl</Code> to control external monitors, the [https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux] is needed. The relevant {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#Testing\|testing]] repository. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}.		To use <Code>brightnessctl</Code> to control external monitors, the [https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux] is needed. The relevant {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#Testing\|testing]] repository. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}.

Prabuanand: added clarity on testing and akms support with links

2024-12-18T05:55:17Z

added clarity on testing and akms support with links

← Older revision		Revision as of 05:55, 18 December 2024
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	== Brightnessctl ==		== Brightnessctl ==

	The ~~command <Code>~~brightnessctl~~</Code> from~~ {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.		The [https://github.com/Hummer12007/brightnessctl brightnessctl] utility available in {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.

	Optionally enable brightnessctl service to restore brightness settings on reboot:{{Cmd\|# rc-update add brightnessctl}}		Optionally enable brightnessctl service to restore brightness settings on reboot:{{Cmd\|# rc-update add brightnessctl}}

	~~When used with~~ {{Pkg\|ddcci-driver-linux-src}} package~~, brightnessctl can also be used to control external Monitor~~. This requires		To use <Code>brightnessctl</Code> to control external monitors, the [https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux ddcci-driver-linux] is needed. The relevant {{Pkg\|ddcci-driver-linux-src}} package is available in [[Repositories#Testing\|testing]] repository. This driver requires Alpine Kernel Module Support {{Pkg\|akms}}.

	== Ddcutil ==		== Ddcutil ==

	The ~~command <Code>~~ddcutil</~~Code> from~~ the ~~package~~ {{Pkg\|ddcutil}} can be used to control brightness in external monitors, if your hardware supports it.		The [https://www.ddcutil.com/ ddcutil] utility available in the {{Pkg\|ddcutil}} package can be used to control brightness in external monitors, if your hardware supports it.

	Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|ddcutil -d 1 getvcp 10}}		Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|ddcutil -d 1 getvcp 10}}
	To set brightness of your monitor to 50% issue the command: {{Cmd\|ddcutil -d 1 setvcp 10 50}}		To set brightness of your monitor to 50% issue the command: {{Cmd\|ddcutil -d 1 setvcp 10 50}}
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	== See Also ==		== See Also ==

	* [https://~~www.ddcutil~~.com/ ~~Ddcutil~~ official website]		* [https://github.com/jirutka/akms Alpine Kernel Module Support(AKMS) official website ]

	[[Category:Desktop]]		[[Category:Desktop]]

Prabuanand: moved Brightnessctl from sway page to this page

2024-12-18T05:35:02Z

moved Brightnessctl from sway page to this page

← Older revision		Revision as of 05:35, 18 December 2024
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	Backlight control of liquid-crystal displays (LCDs) screen is covered in this page.~~There are multiple utilities available for this purpose~~.		Backlight control of liquid-crystal displays (LCDs) screen is covered in this page. Controlling display backlight requires either the proper udev rules, or using some form of privilege escalation.

	{{Pkg\|brightnessctl}} is one popular ~~package~~. ~~Refer [[Sway~~#~~Brightness control~~\|~~Brightness~~ control~~]] for more information~~.		There are multiple utilities available for this purpose.

			== Brightnessctl ==

			The command <Code>brightnessctl</Code> from {{Pkg\|brightnessctl}} package is one popular and reliable alternative, although its default udev rules require too wide permissions (see {{Issue\|15409}}). You may need your own rules, or configure doas to allow running it as an unprivileged user.

			Optionally enable brightnessctl service to restore brightness settings on reboot:{{Cmd\|# rc-update add brightnessctl}}

			When used with {{Pkg\|ddcci-driver-linux-src}} package, brightnessctl can also be used to control external Monitor. This requires

	== Ddcutil ==		== Ddcutil ==

	The command <Code>ddcutil</Code> from the package {{Pkg\|ddcutil}} can be used to control brightness in external monitors, if your hardware supports it.		The command <Code>ddcutil</Code> from the package {{Pkg\|ddcutil}} can be used to control brightness in external monitors, if your hardware supports it.
	Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|ddcutil -d 1 getvcp 10}}		Once the package is installed, check the current brightness of your monitor by issuing the command {{Cmd\|ddcutil -d 1 getvcp 10}}

Prabuanand: removed previously commented out lines

2024-12-17T17:34:47Z

removed previously commented out lines

← Older revision		Revision as of 17:34, 17 December 2024
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	ddcutil requires module i2c-dev.		ddcutil requires module i2c-dev.
	</Pre>		</Pre>
	If you receive the above error,on running <Code>ddcutil</Code>, then load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}		If you receive the above error, on running <Code>ddcutil</Code>, then load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}
	Rebooting the computer after installing {{Pkg\|ddcutil}} should automatically load the above module based on {{Path\|/usr/lib/modules-load.d/ddcutil.conf}}.		Rebooting the computer after installing {{Pkg\|ddcutil}} should automatically load the above module based on {{Path\|/usr/lib/modules-load.d/ddcutil.conf}}.
	~~<!--If after rebooting, the <Code>i2c-dev</Code> module is not loaded, issue the command: {{Cmd\|# echo i2c-dev >> /etc/modules-load.d/i2c.conf}}-->~~

	== See Also ==		== See Also ==

Prabuanand: fixed the permanent solution after checking the package file list and documentation

2024-12-17T17:29:12Z

fixed the permanent solution after checking the package file list and documentation

← Older revision		Revision as of 17:29, 17 December 2024
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	</Pre>		</Pre>
	If you receive the above error,on running <Code>ddcutil</Code>, then load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}		If you receive the above error,on running <Code>ddcutil</Code>, then load the <Code>i2c-dev</Code> kernel module:{{Cmd\|# modprobe i2c-dev}}
	~~To ensure that~~ <Code>i2c-dev</Code> module is ~~permanently~~ loaded ~~from next boot~~, issue the command: {{Cmd\|# echo i2c-dev >> /etc/modules-load.d/i2c.conf}}		Rebooting the computer after installing {{Pkg\|ddcutil}} should automatically load the above module based on {{Path\|/usr/lib/modules-load.d/ddcutil.conf}}.
			<!--If after rebooting, the <Code>i2c-dev</Code> module is not loaded, issue the command: {{Cmd\|# echo i2c-dev >> /etc/modules-load.d/i2c.conf}}-->

	== See Also ==		== See Also ==