Fix for Acer AN515-47 Linux Screen Brightness Issue

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Hey everyone! 👋

I’ve just released a solution for an issue that many Acer AN515-47 laptop users experience while running Linux — screen brightness control not working. This issue can be quite frustrating, but I’ve documented and provided a working fix for it on my GitHub!

🔧 What’s this about?

In this repository, I’ve shared a detailed guide and a script to fix the screen brightness issue for those using Linux on the Acer AN515-47 model.

💻 What you’ll find:

  • Step-by-step instructions on applying the fix
  • A script that automatically adjusts the screen brightness
  • Troubleshooting tips for any related issues

Feel free to check it out, contribute, or raise any questions. I hope this helps those of you encountering similar problems with your Linux setup on Acer laptops!

🔗 GitHub Repository: https://lnkd.in/gSpn5cAW

Practice Verified Codes and Commands

Here’s a sample script to adjust screen brightness on Linux:

#!/bin/bash

<h1>Set brightness level (replace VALUE with desired brightness level, e.g., 500)</h1>

echo 500 | sudo tee /sys/class/backlight/amdgpu_bl0/brightness

<h1>Check current brightness level</h1>

cat /sys/class/backlight/amdgpu_bl0/brightness

<h1>Troubleshooting: If the above path doesn't exist, find the correct backlight interface</h1>

ls /sys/class/backlight/

Common Linux Commands for Brightness Control:

1. Check available backlight interfaces:

ls /sys/class/backlight/

2. Set brightness manually (replace `amdgpu_bl0` with your interface): 

echo 300 | sudo tee /sys/class/backlight/amdgpu_bl0/brightness

3. Check maximum brightness value:

cat /sys/class/backlight/amdgpu_bl0/max_brightness

4. Automate brightness adjustment with a script:

#!/bin/bash
MAX_BRIGHTNESS=$(cat /sys/class/backlight/amdgpu_bl0/max_brightness)
DESIRED_BRIGHTNESS=$(($MAX_BRIGHTNESS / 2))
echo $DESIRED_BRIGHTNESS | sudo tee /sys/class/backlight/amdgpu_bl0/brightness

What Undercode Say

Screen brightness issues on Linux, especially with specific hardware like the Acer AN515-47, can be a common yet frustrating problem. The provided GitHub repository offers a comprehensive solution, including a script and troubleshooting tips. Here are some additional Linux commands and practices to enhance your experience:

  1. Kernel Parameters: If brightness control is still problematic, try adding kernel parameters. Edit `/etc/default/grub` and add `acpi_backlight=vendor` to GRUB_CMDLINE_LINUX_DEFAULT, then update GRUB: 
    sudo update-grub

  2. xrandr for External Displays: If you’re using an external monitor, `xrandr` can help adjust brightness: 

    xrandr --output HDMI-1 --brightness 0.7

  3. Systemd Service for Persistent Brightness: Create a systemd service to set brightness at boot: 

    sudo nano /etc/systemd/system/brightness.service

Add the following:

[Unit]
Description=Set brightness level

[Service]
ExecStart=/bin/bash -c "echo 500 > /sys/class/backlight/amdgpu_bl0/brightness"

[Install]
WantedBy=multi-user.target

Enable and start the service:

sudo systemctl enable brightness.service
sudo systemctl start brightness.service
  1. Debugging Tips: Use `dmesg` to check for hardware-related errors: 
    dmesg | grep -i backlight

  2. Alternative Tools: Install `brightnessctl` for easier brightness control: 

    sudo apt install brightnessctl
brightnessctl set 50%

For more advanced users, exploring kernel modules and ACPI settings can provide deeper insights into hardware compatibility. Always ensure your system is updated to the latest kernel version for better hardware support.

🔗 Additional Resources:

By combining the provided script with these commands and practices, you can achieve a seamless Linux experience on your Acer AN515-47. Happy coding! 🚀

References:

initially reported by: https://www.linkedin.com/posts/adithyanhp_linux-github-opensource-ugcPost-7301275036881993729-axY0 – Hackers Feeds
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