Why would screen brightness not adjust ofter closing laptop lid?

Question

Brightness adjustment works until I close my laptop. After I close it once I cannot adjust the brightness.

I often restart the computer to be able to adjust again. The Fn Keys do not work. The Brightness and Lock settings don't respond.

There must be a better way.

Toshiba, Portege.

Here is the etc/acpi/lid.sh read out. Could I adjust it?

    #!/bin/bash
# TODO:  Change the above to /bin/sh

test -f /usr/share/acpi-support/state-funcs || exit 0

. /usr/share/acpi-support/power-funcs
. /usr/share/acpi-support/policy-funcs
. /etc/default/acpi-support

[ -x /etc/acpi/local/lid.sh.pre ] && /etc/acpi/local/lid.sh.pre

if [ `CheckPolicy` = 0 ]; then exit; fi

grep -q closed /proc/acpi/button/lid/*/state
if [ $? = 0 ]
then
    for x in /tmp/.X11-unix/*; do
    displaynum=`echo $x | sed s#/tmp/.X11-unix/X##`
    getXuser;
    if [ x"$XAUTHORITY" != x"" ]; then
        export DISPLAY=":$displaynum"       
        . /usr/share/acpi-support/screenblank
    fi
    done
else
    for x in /tmp/.X11-unix/*; do
    displaynum=`echo $x | sed s#/tmp/.X11-unix/X##`
    getXuser;
    if [ x"$XAUTHORITY" != x"" ]; then
        export DISPLAY=":$displaynum"
        grep -q off-line /proc/acpi/ac_adapter/*/state
        if [ $? = 1 ]
        then
        if pidof xscreensaver > /dev/null; then 
            su $user -c "xscreensaver-command -unthrottle"
        fi
        fi
        if [ x$RADEON_LIGHT = xtrue ]; then
        [ -x /usr/sbin/radeontool ] && radeontool light on
        fi
        if [ `pidof xscreensaver` ]; then
        su $user -c "xscreensaver-command -deactivate"
        fi
        su $user -c "xset dpms force on"
    fi
    done
fi
[ -x /etc/acpi/local/lid.sh.post ] && /etc/acpi/local/lid.sh.post

score 0 · Answer 1 · answered Oct 05 '12 at 18:28

I had the same problem with a Toshiba Portege R935, and I discovered this (not so elegant) workaround:

as root change the value in sys/class/backlight/intel_backlight/brightness

for example:
```
echo 3000 > /sys/class/backlight/intel_backlight/brightness
```

Warning: these values are not between 0 and 7 (as the ones in sys/class/backlight/toshiba/), but between284and4539`, or something like that.

Why would screen brightness not adjust ofter closing laptop lid?

1 Answers1