vaio VGN-Z21WN brightness problem on 8.10 intrepid

Bug #301802 reported by ced
4
Affects Status Importance Assigned to Milestone
acpi (Ubuntu)
New
Undecided
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Bug Description

I am running ubuntu 8.10 on a new VGN-Z21WN

The brightness is always maximum.
- moving the cursor on gnome-brightness-applet is doing nothing
- using fn-F5 and fn-F6 is doing nothing
- "echo 3 > /sys/class/backlight/sony/brightness" is doing nothing (actual_brightness stays at 7)
- I also found a package spicctrl, also not working

Revision history for this message
Eric Donkersloot (ericd) wrote :

I have exactly the same issues on my VGN-BZ12XN

Revision history for this message
Eric Donkersloot (ericd) wrote :

Can you start the following script after the graphical login and see if you can set the brightness manually (start with the i option):

#!/bin/bash

while true; do
 clear
 echo "up = Screen Brightness Up"
 echo "down = Screen Brightness Down"
 echo "i = Initialize Hardware"
 echo "q = Quit"

 read -s -n1 key

 clear

 case "$key" in
  $'\033')
   read -s -n1 key; read -s -n1 key
   case "$key" in
    A)
     xbacklight -time 0 -steps 1 -inc 10 2>/tmp/sonybright.log
     ;;
    B)
     xbacklight -time 0 -steps 1 -dec 10 2>/tmp/sonybright.log
     ;;
   esac
   ;;
  i)
   xrandr --output LVDS --set BACKLIGHT_CONTROL native
   ;;
  q)
   clear
   exit 0
   ;;
 esac
done

Revision history for this message
ced (ubuntu-grumly) wrote :

your script is working :)

so where is the bug ? is there a way to make this work with fn-keys and gnome-power-manager ?

thank you

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