Cant adjust the screen brightness on Samsung N150 with netbook remix.

Bug #546005 reported by sean_trewartha@hotmail.com on 2010-03-24
54
This bug affects 10 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
Unassigned

Bug Description

I have no complaints about Netbook Remix and 9.10 except that i cant adjust the screen brightness. its always at half.
Very occaisionally and i dont know why it will be at 100% when first boot, so and get a drink and 5 mins later its at 50% again.

Function keyswork for sound, but not for screen brightness.

any ideas.,

Sean

ProblemType: Bug
Architecture: i386
Date: Wed Mar 24 23:02:36 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
Package: firefox-3.5 3.5.8+build1+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-20.57-generic
SourcePackage: firefox-3.5
Tags: ubuntu-unr
Uname: Linux 2.6.31-20-generic i686

Andreas Heck (aheck) wrote :

I have the same problem with 10.04 Beta on the N150.

A workaround is to create a file called brightness.sh somewhere with this content:

#!/bin/sh

sudo setpci -s 00:02.0 F4.B=$1

Then just execute: chmod a+x brightness.sh

After that you can execute brightness.sh with a hex number between 0 (off) and ff (full brightness) like this:

./brightness.sh 50

This is kind of ugly but it is much better than not being able to change brightness at all.

I'm not an expert on kernel and X dirvers but for me the problem seems to be that the X driver doesn't support the xrandr brightness property. If I call xrandr --verbose on the N150 this property doesn't appear while it is present if I execute the same command on a machine where changing the brightness with the gnome panel applet works.

Changed in ubuntu:
status: New → Confirmed

Wow, your far more advaced than me, however i found another way too.
When the computer boots and mine is Dual boot. at the boot list, i can tap the screen brightness up arrow whilst holding the CNTL or FN key cant remember now and the screen will brighten.

Then it boots as normal into Ubuntu and all is good. but once loaded cant do anything....

I also have an issue with the Wireless disconnecting every ??? 10minutes odd, its not directly 10m - it could be 4minutes, but seldom over 10-15m

Ive logged into another wireless system to see if its applicable there, and it is...

Thanks for your message.

Sean

> Date: Sun, 11 Apr 2010 15:18:50 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 546005] Re: Cant adjust the screen brightness on Samsung N150 with netbook remix.
>
> I have the same problem with 10.04 Beta on the N150.
>
> A workaround is to create a file called brightness.sh somewhere with
> this content:
>
> #!/bin/sh
>
> sudo setpci -s 00:02.0 F4.B=$1
>
> Then just execute: chmod a+x brightness.sh
>
> After that you can execute brightness.sh with a hex number between 0
> (off) and ff (full brightness) like this:
>
> ./brightness.sh 50
>
> This is kind of ugly but it is much better than not being able to change
> brightness at all.
>
> I'm not an expert on kernel and X dirvers but for me the problem seems
> to be that the X driver doesn't support the xrandr brightness property.
> If I call xrandr --verbose on the N150 this property doesn't appear
> while it is present if I execute the same command on a machine where
> changing the brightness with the gnome panel applet works.
>
> ** Attachment added: "Output from xrandr --verbose on N150 with Ubuntu 10.04 Beta"
> http://launchpadlibrarian.net/43806197/xrandr.out
>
> ** Changed in: ubuntu
> Status: New => Confirmed
>
> --
> Cant adjust the screen brightness on Samsung N150 with netbook remix.
> https://bugs.launchpad.net/bugs/546005
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Ubuntu: Confirmed
>
> Bug description:
> I have no complaints about Netbook Remix and 9.10 except that i cant adjust the screen brightness. its always at half.
> Very occaisionally and i dont know why it will be at 100% when first boot, so and get a drink and 5 mins later its at 50% again.
>
> Function keyswork for sound, but not for screen brightness.
>
> any ideas.,
>
> Sean
>
> ProblemType: Bug
> Architecture: i386
> Date: Wed Mar 24 23:02:36 2010
> DistroRelease: Ubuntu 9.10
> InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
> Package: firefox-3.5 3.5.8+build1+nobinonly-0ubuntu0.9.10.1
> ProcEnviron:
> LANG=en_AU.UTF-8
> SHELL=/bin/bash
> ProcVersionSignature: Ubuntu 2.6.31-20.57-generic
> SourcePackage: firefox-3.5
> Tags: ubuntu-unr
> Uname: Linux 2.6.31-20-generic i686
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+bug/546005/+subscribe

Andreas Heck (aheck) wrote :

Hi Sean,

I have absolutely no problems with WLAN on 10.04. Maybe you should open a separate bug.

Best regards,

Andreas

Pietro Battiston (toobaz) wrote :

You may be interested in http://www.pietrobattiston.it/brightung , though it's not a particularly brilliant piece of software.

Can you test with updated Lucid or preferably Maverick?
Also, can you set the brightness using the brightness applet?

affects: ubuntu → linux (Ubuntu)
Changed in linux (Ubuntu):
status: Confirmed → Incomplete

I can only adjust the brightness when the computer restarts, and it displays the grub boot menu.
by using the FN key and the brightness up arrow.

Other than that it doesn't work.
Its a workaround, that works. so ?????

Thanks

> Date: Wed, 25 Aug 2010 20:00:17 +0000
> From: <email address hidden>
> To: <email address hidden>
> Subject: [Bug 546005] Re: Cant adjust the screen brightness on Samsung N150 with netbook remix.
>
> Can you test with updated Lucid or preferably Maverick?
> Also, can you set the brightness using the brightness applet?
>
> ** Package changed: ubuntu => linux (Ubuntu)
>
> ** Changed in: linux (Ubuntu)
> Status: Confirmed => Incomplete
>
> --
> Cant adjust the screen brightness on Samsung N150 with netbook remix.
> https://bugs.launchpad.net/bugs/546005
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” package in Ubuntu: Incomplete
>
> Bug description:
> I have no complaints about Netbook Remix and 9.10 except that i cant adjust the screen brightness. its always at half.
> Very occaisionally and i dont know why it will be at 100% when first boot, so and get a drink and 5 mins later its at 50% again.
>
> Function keyswork for sound, but not for screen brightness.
>
> any ideas.,
>
> Sean
>
> ProblemType: Bug
> Architecture: i386
> Date: Wed Mar 24 23:02:36 2010
> DistroRelease: Ubuntu 9.10
> InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
> Package: firefox-3.5 3.5.8+build1+nobinonly-0ubuntu0.9.10.1
> ProcEnviron:
> LANG=en_AU.UTF-8
> SHELL=/bin/bash
> ProcVersionSignature: Ubuntu 2.6.31-20.57-generic
> SourcePackage: firefox-3.5
> Tags: ubuntu-unr
> Uname: Linux 2.6.31-20-generic i686
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/546005/+subscribe

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