Linux On My Samsung

voRia wrote:

slasher-fun wrote: Hi,

Screen Backlight support seems not working with 2.6.30-10. Works fine with -9.

Kernel 2.6.30-10 enables KMS by default, breaking screen backlight support.
You can disable KMS by creating a new .conf file in /etc/modprobe.d/ containing this line:

Code: Select all

options i915 modeset=0

or you can use the kernel 2.6.30-10 from my repository, in which I've disabled KMS by default.

# setpci -s 00:02.1 F4.B=xx

crocomo wrote: If that's still a problem... for the backlight you can use setpci to directly write the values because xbacklight also broke for me since I started using KMS. So this is rather a dirty workaround...

Code: Select all

# setpci -s 00:02.1 F4.B=xx

Where xx ranges from 00 to ff. (00 being minimum, ff the maximum).

crocomo wrote: Btw, voRia should still know me as I wrote you an E-Mail some long time ago...

voRia wrote: Here you can find a kernel module which enables the backlight control when KMS is in use (more info in this bug report)....

voRia wrote: I remember you
If I'm not wrong your idea was to create a repository/wiki for using ArchLinux on the NC10, right?
If you did it, please give us some links!

'voRia' pid='1761' dateline='1250586200' wrote: Here you can find a kernel module which enables the backlight control when KMS is in use (more info in this bug report)....

'voRia' pid='1761' dateline='1250586200' wrote: I remember you
If I'm not wrong your idea was to create a repository/wiki for using ArchLinux on the NC10, right?
If you did it, please give us some links!

crocomo wrote: But the solution via setpci on KMS works like a charm for me. So I'll stick with that for now...

crocomo wrote: Yep! That's me
But since everything is working just fine out of the box (as far as the hardware goes) there is no need for having extra packages in AUR... and there also was an wiki entry, which can be found here. Only describes some general stuff...

voRia wrote: Can you post your script? Maybe I can merge it with my current scripts in order to have different ways to control backlight?

#!/bin/sh


# adjust backlight via setpci and dpms via vbetool


# Check if root called this script
USER=`whoami`
if [ $USER != "root" ]; then
	echo "Need to be root to run this script."
	exit 1
fi

# Get old value
OLD=$[16#`setpci -s 00:02.1 F4.B`]

case "$1" in
	inc)
        # Check if value given
		if [ -z "$2" ]; then
			echo "Usage: $0 $1 <value>"
			exit 1
		fi

		# Take second argument as value to increment
		NEW=$[$OLD+$2]

		# Set new value
		$0 set $NEW
	;;

	dec)
        # Check if value given
		if [ -z "$2" ]; then
			echo "Usage: $0 $1 <value>"
			exit 1
		fi
		
		# Take second argument as value to decrement
		NEW=$[$OLD-$2]

		# Set new value
		$0 set $NEW
	;;

	set)
		# Check if value given
		if [ -z "$2" ]; then
			echo "Usage: $0 $1 <value>"
			exit 1
		fi
		
		# Take second argument as value to set
		NEW=$2

		# Check if value less than 0
		if [ "$NEW" -lt "0" ]; then
			NEW=0
		fi

		# Check if value greater than 255
		if [ "$NEW" -gt "255" ]; then
			NEW=255
		fi
	
		# Set new value
		setpci -s 00:02.1 F4.B=`echo "obase=16; ibase=10; $NEW" | bc`
	;;

	toggle)
		# Path to logfile
		LOG=/tmp/backlight.log

		# Check if logfile does not exist
	        if [ ! -f $LOG ]; then
			vbetool dpms off
			touch $LOG
		else
			vbetool dpms on
			rm -rf $LOG
		fi
	;;

	*)
		echo "Usage: $0 (inc <value>|dec <value>|set <value>|toggle)"
		exit 1
	;;
esac

exit 0