The brightness of my HP 255 is stuck on its brightest level and won't turn down even when I move the cursor back and forward. I tried some of the answers to this on my computer, and now the whole brightness control bar is missing. I'm new on Ubuntu, so can somebody please help me?
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try this:http://askubuntu.com/a/503602/294611 OR http://itsfoss.com/fix-brightness-ubuntu-1310/ – Alex Jones Dec 02 '14 at 05:18
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Try this:
- Open a terminal (Ctrl + Alt + T).
- Then type
sudo nano /etc/default/grub. It will ask for your password. Type it in. - Around the 11th line, there will be something like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". Change it toGRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" - Save the file by Ctrl+O followed by Ctrl+X. Then run
sudo update-grubin the terminal. - Reboot and see if backlight adjustment works. If not, undo the changes you did above, by invoking the text editor as in steps 1 and 2.
Hope it helps.
Works for Acer Aspire v3-571,Acer Aspire v3 571g,Hewlett Packard Bell EasyNote TS,Acer Aspire 4755G,Acer Aspire 5750-6866, Acer Aspire 5739, Lenovo T540p
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Nope, it didn't work. Actually that's what I've tried in the first place and it made the whole brightness bar go missing. – Goce Trpkovski Dec 03 '14 at 19:25