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Thread: Screen brightness does not change on Toshiba Satellite in Karmic

  1. #1
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    Screen brightness does not change on Toshiba Satellite in Karmic

    I've just purchased a new Satellite T135 and installed a fresh copy of Karmic Koala on it. Pretty much everything works great right out of the box. I had to use ndiswrapper for wireless, but it wasn't a huge hassle. Unfortunately, there seems to be a hardware issue with the brightness changing.

    The brightness is controlled using a combination of Fn and F keys. The strange thing is that Karmic actually responds to the key presses, and changes the brightness value. But this is not reflected in the actual brightness of the screen. I have tried brightness applet by itself as well to no avail. Also, the screen does not automatically dim when it is taken off of AC power. It almost appears to be 'stuck' on full brightness at all times.

    It isn't a huge issue, but I can get 9 hrs of battery life in Windows 7, and only about 6.5 in Karmic, and I suspect that this issue is the largest factor. Any help would be appreciated.

  2. #2
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    bump

  3. #3
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    I'm having the exact same problem with a new laptop as well. It is a different make/model than yours so I am wondering if this is a widespread problem in 9.10. I've searched the forums and other have reported similar issues. I wonder if there is a bug report on this...

  4. #4
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    Post Re: Screen brightness does not change on Toshiba Satellite in Karmic

    same thing here, on an Acer 5810TZ, on 9.04 I was able to just type this in a terminal:

    Code:
    xrandr --output LVDS --set BACKLIGHT_CONTROL native
    And I can control the brightness perfectly. But now on karmic if I execute that command I get:

    Code:
    X Error of failed request:  BadRROutput (invalid Output parameter)
      Major opcode of failed request:  149 (RANDR)
      Minor opcode of failed request:  15 (RRGetOutputProperty)
      Serial number of failed request:  30
      Current serial number in output stream:  30
    Any help would be appreciated
    Linux User#498977
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  5. #5
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    X1R1, I just tried your xrandr command and I get the exact same error. As this is a new laptop, I've only run Karmic on it, but from the sounds of it, this is a Karmic specific problem.

    I'm doing a little research into what could be going on with xrandr.

  6. #6
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    Okay, I've now got brightness controls working perfectly. I used the fix discussed in this post: http://ubuntuforums.org/showthread.php?t=121742

    Basically, all you do is edit /etc/default/grub You add 'nomodeset acpi_backlight=vendor' to the GRUB_CMDLINE_LINUX_DEFAULT line.

    Everything works as expected, except for some reason the lowest brightness setting turns the screen off completely. I don't know whether or not this is a feature or a bug. Either way, I'm satisfied with this fix. I hope it works for you guys too.

  7. #7
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    Quote Originally Posted by eOgas View Post
    Okay, I've now got brightness controls working perfectly. I used the fix discussed in this post: http://ubuntuforums.org/showthread.php?t=121742

    Basically, all you do is edit /etc/default/grub You add 'nomodeset acpi_backlight=vendor' to the GRUB_CMDLINE_LINUX_DEFAULT line.

    Everything works as expected, except for some reason the lowest brightness setting turns the screen off completely. I don't know whether or not this is a feature or a bug. Either way, I'm satisfied with this fix. I hope it works for you guys too.
    I am using Ubuntu 9.10 (upgraded from 9.04) and I haven't such file /etc/default/grub. Please help!

  8. #8
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    Smile Re: Screen brightness does not change on Toshiba Satellite in Karmic

    The fix mentioned above worked for me. I'm new to Ubuntu so it's a relief to be able to find help online. Thank you!

  9. #9
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    Quote Originally Posted by stz184 View Post
    I am using Ubuntu 9.10 (upgraded from 9.04) and I haven't such file /etc/default/grub. Please help!

    You should edit the following section:

    Code:
    ## additional options to use with the default boot option, but not with the
    ## alternatives
    ## e.g. defoptions=vga=791 resume=/dev/hda5
    # defoptions=quiet splash
    to

    Code:
    ## additional options to use with the default boot option, but not with the
    ## alternatives
    ## e.g. defoptions=vga=791 resume=/dev/hda5
    # defoptions=quiet splash nomodeset acpi_backlight=vendor
    And run grub-update as root:

    Code:
    sudo grub-update
    That should fix it.
    Last edited by slakkie; November 17th, 2009 at 06:52 PM.
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  10. #10
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    Re: Screen brightness does not change on Toshiba Satellite in Karmic

    Quote Originally Posted by slakkie View Post
    You should edit the following section:
    How does he edit a file he does not have? no /etc/default/grub in my system either:

    Code:
    user@pc:/etc/default$ ls
    acpid         cacerts        kernel-helper-rc                 samba
    acpi-support  console-setup  klogd                            saned
    alsa          cron           linux-restricted-modules-common  ssh
    apmd          cups           locale                           syslogd
    apport        dbus           ntp                              tmpfs
    avahi-daemon  ddclient       ntpdate                          ufw
    bluetooth     devpts         pulseaudio                       useradd
    bootlogd      hal            rcS                              virtualbox-ose
    brltty        halt           rsync
    EDIT: the file path seems related to Grub2, which is not installed during the update (see: https://wiki.ubuntu.com/Grub2)
    Last edited by nomnex; November 23rd, 2009 at 06:50 PM.

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