When I press brightness contrast button to reduce and increase the brightness in Ubuntu it is neither showing any brightness bar nor having any effect on brightness.
However, when I manually change my brightness, it is working.
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Unclear. Brightness issues are rather hardware-dependent. Please add your machine details , and explain what button you mean, and what you mean by "manually" – Zanna Jul 07 '17 at 21:53
1 Answers
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The file you should fix is named "grub" at this address: Open Nautilus (Files), go to Computer
/etc/default/grub
to edit this you should have root access or just open terminal and run this
sudo -H gedit /etc/default/grub
Check this out:
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
on the 11th line it says:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
so change it to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
and then run this command in terminal
sudo update-grub
then it should be fixed after restarting the system.
Sometimes it doesn't work like this, you may like to test the change like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
don't forget to run sudo update-grub and restart
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`/etc/default/grub` is the actual location of the file, not `Computer/etc/default/grub`. – wjandrea Jun 30 '17 at 14:08
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The part about how you may not be able to access the file is pointless. You don't need to run `sudo gedit` then use the "Open" dialog, but just give the absolute path of the file in the command: `sudo gedit /etc/default/grub`, as you wrote. – wjandrea Jun 30 '17 at 14:08
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@wjandrea , you are right as a **pro** but lots of people using "Files" browser can't find it because "Files" opens `"/home"` as default. so they just need to click on the "computer" on the left side to find `"/etc"` at `"/"` – Mirza Jul 01 '17 at 07:53
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Oh, I see what you're getting at, but that's a confusing way to explain it, even for newcomers. It might be better to say "Open Nautilus (Files), go to **Computer** ...", but given the scope of your answer, you don't even need to mention Nautilus. I would say just leave it out entirely, especially since not everyone uses Nautilus; in fact, if I open **Computer** in Nemo, it takes me to `computer:///`, which has a list of disks, not the FS root. – wjandrea Jul 01 '17 at 18:46
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