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Thread: Monitor Brightness

  1. #21
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    Re: Monitor Brightness

    As of now, seems perfect
    Thanx Buddy !

  2. #22
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    Re: Monitor Brightness

    Quote Originally Posted by 3dmatrix View Post
    as of now, seems perfect

    good!
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  3. #23
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    Re: Monitor Brightness

    I updated the system yesterday and since then there is again problem of a different kind. Now the system after login / reboot starts with maximum brightness and i can just reduce the brightness by about 15 - 20 % only.

    The rc.local file is unchanged.
    /sys/class/backlight earlier had three links now has two links
    /sys/class/backlight/intel_backlight has files with the following values :
    actual_brightness - 3718
    brightness - 1000
    max_brightness - 4648

    Though i can control the brightness by the command :
    echo 1000 > /sys/class/backlight/intel_backlight/brightness
    but as soon as i use the keyboard shortcuts i again goes back to the maximum level and can be reduced only by about 10% or by the command.

  4. #24
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    Re: Monitor Brightness

    Οκ.

    Give the results of these commands

    Code:
    cat /etc/default/grub | grep GRUB_CMDLINE
    ls /sys/class/backlight/*
    sudo cat /var/log/apt/term.log | tail -n 40
    Thanks
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  5. #25
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    Re: Monitor Brightness

    cat /etc/default/grub | grep GRUB_CMDLINE
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
    GRUB_CMDLINE_LINUX=""

    ls /sys/class/backlight/*
    /sys/class/backlight/acpi_video0:
    actual_brightness brightness max_brightness subsystem uevent
    bl_power device power type

    /sys/class/backlight/intel_backlight:
    actual_brightness brightness max_brightness subsystem uevent
    bl_power device power type

    sudo cat /var/log/apt/term.log | tail -n 40
    Setting up skype (4.0.0.8-0oneiric1) ...
    Log ended: 2012-09-25 05:00:03

    Log started: 2012-09-25 05:40:05
    (Reading database ... 241047 files and directories currently installed.)
    Removing opera ...
    update-alternatives: using /usr/bin/chromium-browser to provide /usr/bin/x-www-browser (x-www-browser) in auto mode.
    update-alternatives: using /usr/bin/chromium-browser to provide /usr/bin/gnome-www-browser (gnome-www-browser) in auto mode.
    locale: Cannot set LC_CTYPE to default locale: No such file or directory
    locale: Cannot set LC_MESSAGES to default locale: No such file or directory
    locale: Cannot set LC_ALL to default locale: No such file or directory
    WARNING:softwarecenter.db.update:setlocale failed with 'unsupported locale setting'
    Updating software catalog...this may take a moment.
    INFO:softwarecenter.db.pkginfo_impl.aptcache:aptca che.open()
    Software catalog update was successful.
    Processing triggers for software-center ...
    WARNING:softwarecenter.db.update:setlocale failed with 'unsupported locale setting'
    Updating software catalog...this may take a moment.
    INFO:softwarecenter.db.pkginfo_impl.aptcache:aptca che.open()
    Software catalog update was successful.
    Processing triggers for man-db ...
    locale: Cannot set LC_CTYPE to default locale: No such file or directory
    locale: Cannot set LC_MESSAGES to default locale: No such file or directory
    locale: Cannot set LC_ALL to default locale: No such file or directory
    Processing triggers for hicolor-icon-theme ...
    Processing triggers for desktop-file-utils ...
    Processing triggers for bamfdaemon ...
    Rebuilding /usr/share/applications/bamf.index...
    Processing triggers for gnome-menus ...
    Processing triggers for shared-mime-info ...
    Unknown media type in type 'all/all'
    Unknown media type in type 'all/allfiles'
    Unknown media type in type 'uri/mms'
    Unknown media type in type 'uri/mmst'
    Unknown media type in type 'uri/mmsu'
    Unknown media type in type 'uri/pnm'
    Unknown media type in type 'uri/rtspt'
    Unknown media type in type 'uri/rtspu'
    Processing triggers for menu ...
    Log ended: 2012-09-25 05:40:50

  6. #26
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    Re: Monitor Brightness

    Hi ,

    remove the parameter acpi_osi= , also commented the line echo 1000 > /sys/class/backlight/intel_backlight/brightness in /etc/rc.local
    make it like this
    #echo 1000 > /sys/class/backlight/intel_backlight/brightness

    Reboot your pc and see the behavior.

    Do not forget to run
    Code:
    sudo update-grub
    before reboot.Thanks
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  7. #27
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    Re: Monitor Brightness

    Sorry for the delay.
    I made the changes in the following files :
    /etc/rc.local
    /etc/default/grub

    but nothing happened.

    It is very difficult if we make things go right and there is an upgrade and we have to do the entire investigation once again from scratch ! Everytime !

    .

  8. #28
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    Re: Monitor Brightness

    Any Help ?

  9. #29
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    Re: Monitor Brightness

    Sorry , but your problem is weird. It seems that corrected , but...

    Try again the parameters. Maybe something changed with the update and now you can use other parameters to adjust your brightness correctly.

    I know that this is a pain in the .... , but you must try again. You need 3 reboots. One with each parameter.

    1. acpi_osi=
    2.acpi_osi=Linux
    3.acpi_backlight=vendor

    If non of above do something then try to combine each parameter with this parameter : acpi=force

    Do not forget to run
    Code:
    sudo update-grub
    to pass the parameters to the kernel.

    Thanks
    Last edited by NikTh; September 28th, 2012 at 08:58 PM. Reason: Post Updated
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  10. #30
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    Re: Monitor Brightness

    Quote Originally Posted by NikTh View Post
    1. acpi_osi=
    2.acpi_osi=Linux
    3.acpi_backlight=vendor

    If non of above do something then try to combine each parameter with this parameter : acpi=force
    I am sorry but i did not understand the part marked in RED. I try once each of the codes in 1, 2 and 3 and if it does not works then . . . . (i did not understand this last part) ? Can you kindly give some example.

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