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Linux - Laptop and Netbook Having a problem installing or configuring Linux on your laptop? Need help running Linux on your netbook? This forum is for you. This forum is for any topics relating to Linux and either traditional laptops or netbooks (such as the Asus EEE PC, Everex CloudBook or MSI Wind).

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Old 08-11-2017, 02:15 PM   #1
Woolie Wool
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ThinkPad T520 backlight brightness hotkeys and Xfce slider not working in Linux (Xubuntu 17.04)


The LCD backlight brightness controls for my new laptop (Lenovo Thinkpad T520, replacing the Edge 15 I used before) don't work on Linux at all. I can adjust brightness using the keyboard shortcuts (Fn + Home or End) during the boot sequence but when Linux takes over from the boot loader, these hotkeys no longer work and neither does Xfce's brightness GUI or the xbacklight command line tool I installed. Some Googling revealed multiple contradictory answers that involved digging in config files I really would rather not dig into unless I'm certain the procedure would work. One site said this is apparently a problem with newer kernel versions breaking something about the ThinkPad ACPI driver. Does anybody here know about this problem?
 
Old 08-11-2017, 06:04 PM   #2
AwesomeMachine
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It appears that the functionality is not complete in Linux. It doesn't look like Lenovo supports that in Linux.
 
Old 08-11-2017, 07:07 PM   #3
Trihexagonal
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I don't have my W520 booted up to check but the T61 I'm on now has a brightness control in BIOS.
 
Old 08-11-2017, 08:44 PM   #4
Woolie Wool
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I already said the brightness controls work when the BIOS is running, but when it hands the computer over to Linux, they stop working. Also, does Lenovo even write Linux drivers? I've heard people say that ThinkPad brightness controls used to work but a kernel update broke them.
 
Old 08-11-2017, 09:35 PM   #5
Trihexagonal
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Quote:
Originally Posted by Woolie Wool View Post
I already said the brightness controls work when the BIOS is running, but when it hands the computer over to Linux, they stop working.
No, what you said was:

Quote:
I can adjust brightness using the keyboard shortcuts (Fn + Home or End) during the boot sequence but when Linux takes over from the boot loader, these hotkeys no longer work and neither does Xfce's brightness GUI or the xbacklight command line tool I installed.
I said there is a brightness control in the BIOS settings of my T61. Nothing about pressing Fn + Home or End.
 
Old 08-11-2017, 10:47 PM   #6
Woolie Wool
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There probably is in mine too, but how is that useful for this thread?
 
Old 08-11-2017, 11:02 PM   #7
Trihexagonal
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Quote:
Originally Posted by Woolie Wool View Post
There probably is in mine too, but how is that useful for this thread?
Then excuse me for wasting your time. I won't disrupt your thread further and leave you to it.
 
Old 08-12-2017, 11:12 AM   #8
DavidMcCann
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This is a well-known problem, but you may find a fix that works here:
http://www.thinkwiki.org/wiki/Proble...htness_buttons
 
Old 08-12-2017, 04:40 PM   #9
Woolie Wool
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Thanks for the link, I've only tried the /etc/linux/grub solution so far (didn't work), but I'll try the others later.
 
Old 08-18-2017, 12:48 PM   #10
Rickkkk
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Quote:
Originally Posted by Woolie Wool View Post
Thanks for the link, I've only tried the /etc/linux/grub solution so far (didn't work), but I'll try the others later.
... There is also a command-line solution to operate on screen brightness if you can't get the buttons to work. Let us know if you need to go there ...

Cheers,
 
  


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