samsung q 210 notebook is too dark - nvidia issue!?

[Martin Kaspar]

hello dear community,


the notebook samsung q 210 has got no brightness.

in other words i cannot controll it. it is too dark


see the data:

Samsunng q 210, 12,1" OpenSuse 13.1: Intel® Core™ 2 Duo Proz. P8400 2,26 GHz 1066 MHz FSB 3 MB PC2-6400 (800 MHz), DDR2 SODIMM ; NVIDIA GeForce® 9200M GS


saw interesting things

run the command:

echo 5 > /sys/class/backlight/acpi_video0/brightness


found some interesting articles:

https://wiki.archlinux.org/index.php/backlight


btw:


and yes: backlight runs on my notebook.

btw - i am on KDE


linux-70ce:/home/martin # cat /sys/class/backlight/acpi_video0/max_brightness
7
linux-70ce:/home/martin # cat /sys/class/backlight/acpi_video0/max_brightness
7
linux-70ce:/home/martin # xbacklight -inc 40
No outputs have backlight property
linux-70ce:/home/martin #
linux-70ce:/home/martin # xbacklight -dec 40
No outputs have backlight property
linux-70ce:/home/martin #

well i have to do further investigations -i have googled the issue and found some interesting things:
http://www.linuxquestions.org/quest...ghtness-in-samsung-laptop-846888/#post4172674
http://www.linuxquestions.org/quest...en-brightness-control-4175423179/#post4759893
http://community.linuxmint.com/tutorial/view/995
http://murga-linux.com/puppy/viewtopic.php?t=87873



as for this hint - given here:
http://www.linuxquestions.org/quest...ghtness-in-samsung-laptop-846888/#post4172674

I am using a Samsung laptop and I found a workaround to adjust the brightness.

just press Alt+F1 to get the terminal only session.

login as root
type this command

echo 1 > /sys/class/backlight/acpi_video0/actual_brightness( for decreasing brightness)
echo 6 > /sys/class/backlight/acpi_video0/actual_brightness( for increasing brightness.)
__________________

this does not work at my site:


linux-70ce:/home/martin # cat /sys/class/backlight/acpi_video0/max_brightness
7
linux-70ce:/home/martin # xbacklight -inc 40
No outputs have backlight property
linux-70ce:/home/martin #
linux-70ce:/home/martin # xbacklight -dec 40
No outputs have backlight property
linux-70ce:/home/martin # echo 6 > /sys/class/backlight/acpi_video0/actual_brightness
bash: /sys/class/backlight/acpi_video0/actual_brightness: Keine Berechtigung
linux-70ce:/home/martin #




any idea to change that?!

love to hear from you

greetings

 

[ex_bubblehead]

The binary NVidia drivers broke brightness control quite a few versions back and NVidia has yet to address the issue. Some people have been able to get it to work as evidenced in your post. However, it's very much hit or miss (mostly miss) and if none of what you've tried works then you're one of those that's currently SOL. I have the same issue on an HP laptop running Gentoo.

 

[Martin Kaspar]

hello dear exbubblehead

many many thanks for the quick answer - well i will retry all the above mentioned things at the weekend.

note: i can change the brigthness with the fn-key - but the maximal brightness is not enough - at least not for me.

do you think that i have listed all (!!!) the possible things that we can do here!?

Or do i have missed some steps that could be done ....!? -

Do you have any further idea of help or a trick to tinker and tweak the system?

love to hear from you

 

[Alabalcho]

When you enter BIOS, and control brightness with <fn> keys - can you get it to a satisfactory level?

 

[Ijack]

https://wiki.archlinux.org/index.php/NVIDIA#Enabling_brightness_control

 

[Martin Kaspar]

hello dear alabalco hello dear ijack


this i need to test tonight:; "When you enter BIOS, and control brightness with <fn> keys - can you get it to a satisfactory level?"

i will let you know the results...


on this site; https://wiki.archlinux.org/index.php/NVIDIA#Enabling_brightness_control

this code does not work for me...:

lspci -k | grep -A 2 -i "VGA"


hmm - i do not know why - but this code does not run for me...

well i need to find out if i have a nvdia in my samsung notebook q 210

 

[skittle]

Can you confirm if the same issue is present on the latest OpenSuse 13.2 or Fedora 21

Maybe it is just a software bug that has been fixed

----EDIT----
BTW on my system (intel) the file:
"/sys/class/backlight/intel_backlight/actual_brightness"
is not writable. and appears to be the same in your case:

"linux-70ce:/home/martin # echo 6 > /sys/class/backlight/acpi_video0/actual_brightness
bash: /sys/class/backlight/acpi_video0/actual_brightness: Keine Berechtigung"

Keine Berechtigung == permission denied

instead the correct file to write brightness value is:
"/sys/class/backlight/intel_backlight/brightness"

or on your system (as root):
echo 6 > /sys/class/backlight/acpi_video0/brightness

You can see the maximum value from the file "max_brightness"

 

[Martin Kaspar]

hello and good day

well yes i run opensuse 13.1 at the moment -
but on previous versions the behaviour was the same.

- the behaviour is the same for more than 1.5 years now...

note: the fn-keys are still workin but i do not like the max brigthness

it is way tooo dark for me....

Can you confirm if the same issue is present on the latest OpenSuse 13.2 or Fedora 21

Maybe it is just a software bug that has been fixed

----EDIT----
BTW on my system (intel) the file:
"/sys/class/backlight/intel_backlight/actual_brightness"
is not writable. and appears to be the same in your case:

"linux-70ce:/home/martin # echo 6 > /sys/class/backlight/acpi_video0/actual_brightness
bash: /sys/class/backlight/acpi_video0/actual_brightness: Keine Berechtigung"

Keine Berechtigung == permission denied

instead the correct file to write brightness value is:
"/sys/class/backlight/intel_backlight/brightness"

or on your system (as root):
echo 6 > /sys/class/backlight/acpi_video0/brightness

You can see the maximum value from the file "max_brightness"

 

[Alabalcho]

Did you check whether this is OS problem (only in Linux/SuSE), or hardware problem (in BIOS)?

 

[Martin Kaspar]

helllo dear friends


note. i run opensuse 13.1

here some more insights -

linux-70ce:/home/martin # lspci -nnk | grep VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G98M [GeForce 9200M GS] [10de:06e8] (rev a1)
linux-70ce:/home/martin #

look forward to hear from you

 

[Alabalcho]

Martin,

I hate to repeat myself, but I have to...

Did you check whether this is OS problem (only in Linux/SuSE), or hardware problem (in BIOS)?

We already know that laptop does not work "properly" under openSuse. Our question to you is very very simple: When in BIOS, can you bring the brightness to desired level using hardware keys?

 

[Martin Kaspar]

hello thx for the hints regarding the bios

tried out that ideas - with no better results

any idea11

 

[skittle]

hello thx for the hints regarding the bios

tried out that ideas - with no better results

any idea11

contact samsung because it sounds more like a hardware issue.

 

[Alabalcho]

hello thx for the hints regarding the bios
tried out that ideas - with no better results
any idea11

contact samsung because it sounds more like a hardware issue.

.... and most probably, Samsung (and everyone else) will want you to reload original Windows before even talking to you.

 

[Martin Kaspar]

hello dear all, i will not reload windows.
hmmm - the noteobok is well known to have a bad display - but i want to make it better.

and i never ever want to have windows back (it was formerly installed - ). Now i run linux - OpenSuse linux.

what can i do to get a brighter display?

any ideas -

a. should i change the bios
b. should i tweak with another nvidia driver?

love to to hear from you

 

[Alabalcho]

Martin, I will try to reiterate once again what was said:
- Is this hardware problem? The only way to check is to enter BIOS, and try brightness control from there
- If this is hardware problem, and your laptop is still in warranty, you have to talk to Samsung.
- You were given software fixes, which youbsaid do not work.

Please DO something before posting again.

 

[Martin Kaspar]

hello dear all

first of all - many thanks for the hints.

to re - write this again: i allready tested the bios - and yes: i was able to change the brightness from dark to more or less bright
so to underline this: the adjustment of brigthness in bios is possilble.

so i am looking for a soliution - i wold be glad to get some ideas how to hack the nvidia -
again; i run opensuse linux version 13.1

....are there some options to do get the display in a brighther way?