Run script as root after X starts
Hello fellow sysadmins
The problem im having is my laptop will boot up without anyone keyboard backlight but with screen at max brightness. As soon as X starts and I get the login screen, my keyboard backlight is at full brightness too.
I found the "echo # > " one liner that works well on tuning my screen brightness and keyboard brightness, but it does have an effect if I add it to rc.local because X starts and everything gets reset. I've tried putting a sleep in my screen and running it in the background so rc.local can execute, the x session can start and I can login and the timer would be up and the script would run, but no luck.
The distro im currently using is Ubuntu. After I can get Ubuntu to run on this laptop the way I want it, im going to move onto other distros. So what I really need to know is how do I run a script after login but AS ROOT because these commands request root to be able to echo the value to the acpi_video0/brightness file or keyboard backlight file.
Any help would be great. Spent two days on this already and havent gotten anywhere.
Comments
-
I know the topic is old, but I thought it best not to leave it without a solution, since I found information closely related to this problem to be sparce.
The text file which contains the value (1-100) of screen brightness on the laptop of the OP should be at /sys/class/backlight/acpi_video0/brightness. A working solution for systems still running init is easily found with some googling.
If you have a system with systemd, you have to create an rc.local script at the following path: /usr/local/sbin/rc.local
It should contain a delayed echo to the brightness file, which will run in the background, such as this:
It will run as root, so no worries. Also, don't forget to make it executable. To do that, open a console and run:- (sleep 15 ; echo "40" > /sys/class/backlight/acpi_video0/brightness)&
.- sudo chmod +x /usr/local/sbin/rc.local
Now, you need to create a systemd service file which will invoke your rc.local script. Create it with this path: /etc/systemd/system/rc-local.service
and with the the following content:
Lastly, enable the service:- [Unit]
- Description=/etc/rc.local Compatibility
- ConditionFileIsExecutable=/usr/local/sbin/rc.local
- [Service]
- Type=oneshot
- ExecStart=/usr/local/sbin/rc.local
- TimeoutSec=0
- StandardOutput=tty
- RemainAfterExit=yes
- SysVStartPriority=99
- [Install]
- WantedBy=multi-user.target
Reboot and be happy.- sudo systemctl enable rc-local
0
Categories
- All Categories
- 145 LFX Mentorship
- 145 LFX Mentorship: Linux Kernel
- 833 Linux Foundation IT Professional Programs
- 380 Cloud Engineer IT Professional Program
- 184 Advanced Cloud Engineer IT Professional Program
- 85 DevOps Engineer IT Professional Program
- 153 Cloud Native Developer IT Professional Program
- 147 Express Training Courses & Microlearning
- 147 Express Courses - Discussion Forum
- Microlearning - Discussion Forum
- 6.8K Training Courses
- 49 LFC110 Class Forum - Discontinued
- 73 LFC131 Class Forum
- 51 LFD102 Class Forum
- 242 LFD103 Class Forum
- 22 LFD110 Class Forum
- 47 LFD121 Class Forum
- 1 LFD123 Class Forum
- LFD125 Class Forum
- 18 LFD133 Class Forum
- 9 LFD134 Class Forum
- 18 LFD137 Class Forum
- 72 LFD201 Class Forum
- 5 LFD210 Class Forum
- 5 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 2 LFD233 Class Forum
- 4 LFD237 Class Forum
- 24 LFD254 Class Forum
- 731 LFD259 Class Forum
- 111 LFD272 Class Forum - Discontinued
- 4 LFD272-JP クラス フォーラム
- 13 LFD273 Class Forum
- 302 LFS101 Class Forum
- 2 LFS111 Class Forum
- 3 LFS112 Class Forum
- 3 LFS116 Class Forum
- 8 LFS118 Class Forum
- 1 LFS120 Class Forum
- 9 LFS142 Class Forum
- 8 LFS144 Class Forum
- 4 LFS145 Class Forum
- 5 LFS146 Class Forum
- 17 LFS148 Class Forum
- 16 LFS151 Class Forum
- 5 LFS157 Class Forum
- 73 LFS158 Class Forum
- LFS158-JP クラス フォーラム
- 12 LFS162 Class Forum
- 2 LFS166 Class Forum
- 7 LFS167 Class Forum
- 3 LFS170 Class Forum
- 2 LFS171 Class Forum
- 3 LFS178 Class Forum
- 3 LFS180 Class Forum
- 2 LFS182 Class Forum
- 5 LFS183 Class Forum
- 35 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 3 LFS201-JP クラス フォーラム - Discontinued
- 21 LFS203 Class Forum
- 140 LFS207 Class Forum
- 2 LFS207-DE-Klassenforum
- 2 LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum
- 56 LFS216 Class Forum
- 55 LFS241 Class Forum
- 50 LFS242 Class Forum
- 38 LFS243 Class Forum
- 16 LFS244 Class Forum
- 6 LFS245 Class Forum
- LFS246 Class Forum
- LFS248 Class Forum
- 119 LFS250 Class Forum
- 2 LFS250-JP クラス フォーラム
- 1 LFS251 Class Forum
- 158 LFS253 Class Forum
- 1 LFS254 Class Forum
- 2 LFS255 Class Forum
- 13 LFS256 Class Forum
- 1 LFS257 Class Forum
- 1.3K LFS258 Class Forum
- 11 LFS258-JP クラス フォーラム
- 137 LFS260 Class Forum
- 164 LFS261 Class Forum
- 43 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 24 LFS267 Class Forum
- 25 LFS268 Class Forum
- 37 LFS269 Class Forum
- 10 LFS270 Class Forum
- 202 LFS272 Class Forum - Discontinued
- 2 LFS272-JP クラス フォーラム
- 4 LFS147 Class Forum
- 2 LFS274 Class Forum
- 4 LFS281 Class Forum
- 29 LFW111 Class Forum
- 262 LFW211 Class Forum
- 186 LFW212 Class Forum
- 15 SKF100 Class Forum
- 1 SKF200 Class Forum
- 2 SKF201 Class Forum
- 797 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 104 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 763 Linux Distributions
- 82 Debian
- 67 Fedora
- 18 Linux Mint
- 13 Mageia
- 23 openSUSE
- 149 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 356 Ubuntu
- 471 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 96 Linux Security
- 78 Network Management
- 102 System Management
- 47 Web Management
- 71 Mobile Computing
- 19 Android
- 39 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 381 Off Topic
- 116 Introductions
- 177 Small Talk
- 27 Study Material
- 811 Programming and Development
- 306 Kernel Development
- 487 Software Development
- 1.8K Software
- 263 Applications
- 183 Command Line
- 4 Compiling/Installing
- 988 Games
- 317 Installation
- 104 All In Program
- 104 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)