ubuntu Broken Ubuntu Brightness

[Stentorian]

The other night I turned my brightness down on my HP EliteBook 2540P running Ubuntu 18.10 as seen here: 

Spoiler

I have recently tried to turn up the brightness again and it does not go above a certain level leaving the brightness stuck on low. I have read many articles online and none of them have helped. I can't really reinstall Ubuntu all together as I don't have a spare USB Stick and I have a lot of information on this laptop that cannot be lost. 

 

Here is a screenshot of the level it gets stuck at: 

Spoiler

 

If you can provide any help please do in the comments. It really is painful trying to squint to see the monitor. Thanks in advance!

 

EDIT: I have checked for the latest updates and nothing is pending according to Ubuntu!

[manikyath]

https://help.ubuntu.com/stable/ubuntu-help/power-autobrightness.html.en

 

didnt miss this one by any chance?

[Sauron]

We can't see your screen's brightness in a screenshot

 

Try using xbacklight, maybe it's just a gnome bug.

[Guest]

There could be an issue regarding the kernel or the desktop, try using xbacklight as Sauron said, something like xbacklight -set 100

Otherwise, try using acpi_backlight=native in the kernel parameters, in /etc/default/grub
grub_cmdline_linux_default=" ... acpi_backlight=native" where "..." are the other options like quiet, splash, resume=..., etc...

then "sudo update-grub"
and reboot

[Stentorian]

On 12/15/2018 at 10:11 AM, Lukyp said:

There could be an issue regarding the kernel or the desktop, try using xbacklight as Sauron said, something like xbacklight -set 100

Otherwise, try using acpi_backlight=native in the kernel parameters, in /etc/default/grub
grub_cmdline_linux_default=" ... acpi_backlight=native" where "..." are the other options like quiet, splash, resume=..., etc...

then "sudo update-grub"
and reboot

I have tried this solution and it doesn't work.

On 12/14/2018 at 11:10 PM, Sauron said:

We can't see your screen's brightness in a screenshot

 

Try using xbacklight, maybe it's just a gnome bug.

I have tried using xbacklight and that was no help as well.

On 12/14/2018 at 11:10 PM, manikyath said:

https://help.ubuntu.com/stable/ubuntu-help/power-autobrightness.html.en

 

didnt miss this one by any chance?

I have automatic brightness on always. I turned it off and tried it and it still didn't work. 

[Sauron]

2 hours ago, Stentorian said:

I have tried this solution and it doesn't work.

I have tried using xbacklight and that was no help as well.

I have automatic brightness on always. I turned it off and tried it and it still didn't work. 

It almost seems like the backlight hardware might be broken... but to make sure you'd need to reinstall the system. Try booting from the live environment and see if the backlight works properly there; if it doesn't, try reinstalling. If nothing changes your laptop is probably broken.

[Guest]

1 hour ago, Stentorian said:

I have tried this solution and it doesn't work.

I have tried using xbacklight and that was no help as well.

I have automatic brightness on always. I turned it off and tried it and it still didn't work. 

Which xbacklight command you tried? Do you mean the -set command doesn't work?