Screen Brightness in openSUSE

English Hardware
1

Hi. I’m new to using openSUSE, and I’m having a bit of trouble with the screen brightness. I’ve tried a couple suggestions I’ve found online but nothing has helped so far. I’m dualbooting openSUSE with windows 8.1 on an Acer Aspire with Intel Graphics. Are there any suggestions on how to fix the brightness? Thank you in advance.

2

Hi
As in the Fn keys not working to adjust the brightness? Or just brightness in general?

What desktop are you using?

3

Both. The fn keys work to change the volume but when I use the fn keys to change the brightness nothing happens. I’m using the KDE desktop environment. One more thing to note, is that the brightness bar changes but not the actual brightness itself. I’ve installed xbacklight but that hasn’t helped either.

4

On Sun 05 Oct 2014 08:46:02 PM CDT, nerdboy1990 wrote:

Both. The fn keys work to change the volume but when I use the fn keys
to change the brightness nothing happens. I’m using the KDE desktop
environment. One more thing to note, is that the brightness bar changes
but not the actual brightness itself. I’ve installed xbacklight but that
hasn’t helped either.

Hi
Possibly an acpi issue, you could try adding a acpi_osi option to the
bootloader options, eg;


acpi_osi=\"!Windows 2012\"

What model laptop?

–
Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
openSUSE 13.1 (Bottle) (x86_64) GNOME 3.10.1 Kernel 3.11.10-21-desktop
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks!

5

It’s an Acer Aspire E1-571-6442

6

Hi
So does the value of the output here change when you use the function keys?


cat /sys/class/backlight/acpi_video0/brightness
7

Yes it did. It changed from a 3 to a 7.

8

I added the line acpi_osi="!Windows 2012" to my bootloader config, restarted my computer and my backlight works now :slight_smile: Thank you for the help! I appreciate

9

On Mon 06 Oct 2014 04:06:01 AM CDT, nerdboy1990 wrote:

I added the line acpi_osi="!Windows 2012" to my bootloader config,
restarted my computer and my backlight works now :slight_smile: Thank you for the
help! I appreciate

Hi
Well a workaround, you should probably raise a bug to see if it can be
fixed. If you do decide to raise one, include the output from hwinfo
and dmidecode as attachments.

–
Cheers Malcolm °¿° LFCS, SUSE Knowledge Partner (Linux Counter #276890)
openSUSE 13.1 (Bottle) (x86_64) GNOME 3.10.1 Kernel 3.11.10-21-desktop
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below… Thanks!

10

I installed 13.1x64 KDE on a new HP Envy 17-j130us touchsmart and my /sys/class/backlight directory is empty. I tried adding acpi_osi="!Windows 2012" as an optional command line parameter - but the brightness keys still don’t work. The sound keys do… others also seem to. I installed xbacklight and issued the commands:

patti@HPE-OS131:~> xbacklight -set 50
No outputs have backlight property
patti@HPE-OS131:~>

patti@HPE-OS131:~> /sbin/lspci | egrep 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
patti@HPE-OS131:~>

This has the intel 4800 video, so I guess there are a few issues. But so far the only problem I’ve found is the screen brightness. It seems to be always at max.

Thanks!
Patricia