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I've installed Ubuntu 13.10 on a Lenovo yoga 13. In order to make the backlight work with the keys I've been following some instructions of this answer (link edited)

The process I followed was this:

1) sudo gedit /etc/default/grub (generates errors, I think they are irrelevant - have checked in vim the edit worked)

2) sudo update-grub

3) blacklisted the ideapad_laptop by adding "blacklist ideapad_laptop" to /etc/modprobe.d/blacklist.conf file

Step 2) generates error: /usr/sbin/grub-mkconfig: 27: /etc/default/grub: want: not found

Answers from the comments

  • cat /etc/default/grub does show contents of the file

  • fgrep want /etc/default/grub gives: # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

  • sudo cat /etc/default/grub also shows contents of the file

Update

The grub error from step 2 occurs whenever I try to install anything. I have previously tried to run the command sudo apt-get install grub-pc - which also generates this error. I'm worried I've upset the balance of my computer's universe...

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Jim
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    Does cat /etc/default/grub show the content of that grub-file? –  Oct 21 '13 at 21:59
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    Please attach the output of fgrep want /etc/default/grub to your question. – zwets Oct 21 '13 at 21:59
  • Which of them? There are 4 answers. – Braiam Oct 21 '13 at 22:01
  • perhaps newbish of me ?: sudo apt-get install --reinstall grub - or - sudo apt-get install --reinstall grub2 ? ( I wonder why to do update-grub for backlight ? - there is command xbacklight in terminal and for this after adjusted with this command the backlight only reboot is necessary - but not update-grub ? ) – dschinn1001 Oct 21 '13 at 22:23
  • The output from the fgrep command is:# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux and cat /etc/default/grub does show the content – Jim Oct 22 '13 at 22:53
  • @Braiam the solution is this one: Add the acpi_backlight=vendor to your GRUB_DEFAULT command line Run the sudo update-grub command blacklist the ideapad_laptop by adding blacklist ideapad_laptop to your /etc/modprobe.d/blacklist.conf file. Reboot – Jim Oct 22 '13 at 22:56
  • Any help very gratefully received ! – Jim Oct 22 '13 at 22:56
  • Please edit your question and add the info. Is hard to read it in comments (these are comments), also instead try sudo cat /etc/default/grub – Braiam Oct 22 '13 at 22:59

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Ok, so that was me being an idiot 

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

was missing the quote mark off the end of it - must have made a mistake while editing the file. All sorted now, and the back light is working from the keys.

thanks @braiam for your help.

Jim
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