Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

Basic Specs:

  • Toshiba Portege R705-P35
    • 13.1" screen
    • Intel HD Graphics
    • 4 GB RAM, Core i3 2.4 GHz
  • Dual Boot Ubuntu 11.04 and Windows 7 (using grub bootloader)

Basically, Ubuntu recognizes me pressing the key combinations(Fn+F6 and Fn+F7) for changing my screen brightness and shows the notification bubble where the level changes. However this change isn't actually reflected on the screen. The brightness remains unchanged from what I left it at when I was logged into Windows. This problem has only manifested itself after I update to Natty, the brightness adjustment worked perfectly in 10.10 for me.

It seems I have the same issue as in this: Changing brightness on a Sony Vaio laptop question, however on a Toshiba Portege R705-P35. Even if I knew exactly what to do based on the top answer (yeah, no clue what to do inside the keymap rules), it doesn't seem to be the right thing to do since Ubuntu does recognize my keystrokes anyway.

Relevant, but doesn't solve the issue only presents a workaround:

Can't adjust brightness on my laptop

share|improve this question
    
same issues on Toshiba P835 –  n3rd May 14 '12 at 17:54
    
@n3rd: I have since changed laptops, and I'm sure progress has been made on the issue but the accepted answer helped me fix all my problems. –  chandsie May 16 '12 at 21:50
    
Try installing display drivers: askubuntu.com/questions/247145/… –  user142877 Mar 24 '13 at 6:27
add comment

3 Answers

up vote 1 down vote accepted

Apparently recent kernels are missing some support for toshiba acpi. There are various patches you can experiment with, discussed here: http://ubuntuforums.org/showthread.php?t=1550219

share|improve this answer
    
hmm, very good resource! Thank you! toshset apparently is installed and already running on my computer however it says that it has some kernel issues, as you pointed out would be the case. I'm going to try out some of the fixes suggested in the forum and see what happens! Thank you again! –  chandsie Jun 8 '11 at 0:11
add comment

In 13.04, I found that /sys/class/backlight/toshiba breaks after suspend, but /sys/class/backlight/intel_backlight continues to function (echo $number > backlight after resume from suspend). Some great folks over at Arch have figured this one out. This does the trick:

Source: https://wiki.archlinux.org/index.php/Intel_Graphics#Backlight_not_fully_adjusting.2C_or_adjusting_at_all_after_resume.

Adapting this for Ubuntu 13.04:

  1. sudo vi /etc/default/grub

  2. change the line GRUB_CMDLINE_LINUX_DEFAULT as follows:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    
  3. sudo update-grub

  4. Configure X11 to use the intel_backlight. Create a file called 20-intel.conf here:

    sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf
    
  5. Paste in the following:

    Section "Device"
            Identifier "card0"
            Driver "intel"
            Option "Backlight" "intel_backlight"
            BusID "PCI:0:2:0"
    
    EndSection
    

6) Reboot and bask in glorious brightness control. Suspend/resume and it continues to function normally from the Fn-F6/F7 keys.

share|improve this answer
    
Cheers. This worked for a Toshiba Portege r90 with Ubuntu 13.10. –  Jase_ Feb 2 at 10:47
add comment

@keks-n (via Launchpad) is hosting a script at his/her PPA that automatically applies toshiba-acpi patch to your kernel. I think it even rebuilds DKMS style if you change kernel (?)

sudo apt-add-repository ppa:keks9n/main && sudo apt-get update && sudo apt-get install toshiba-acpi-fix

Check your toshset settings with:

sudo toshset -q

Full list of toggles:

sudo toshset

I've been running this patch for about a month, but the minor functionality gains (ability to adjust brightness after resume, disable bluetooth, kill backlight) appear to be offset by more frequent system hangs. At least that's my perception.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.