Ubuntu – Cannot adjust brightness on the Packard Bell EasyNote TS11HR-127GE laptop

brightnessnvidianvidia-optimus

I am using Ubuntu 12.04 LTS on my Packard Bell EasyNote TS11HR-127GE laptop and I cannot adjust the brightness. If I change the slider, the brightness is always at maximum. My laptop is using NVIDIA Optimus and has a integrated Intel HD 3000 and a NVIDIA GT540M graphic card. I already installed the newest Bumblebee version but this has also no effect.

Anyone an idea?

Here is the output of lsmod:

Module                  Size  Used by
bbswitch               13396  0 
parport_pc             32866  0 
ppdev                  17113  0 
bnep                   18281  2 
rfcomm                 47604  0 
bluetooth             180104  10 bnep,rfcomm
binfmt_misc            17540  1 
snd_hda_codec_hdmi     32474  1 
snd_hda_codec_realtek   223867  1 
snd_hda_intel          33773  3 
snd_hda_codec         127706  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13668  1 snd_hda_codec
snd_pcm                97188  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
arc4                   12529  2 
snd_seq_midi           13324  0 
snd_rawmidi            30748  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61896  2 snd_seq_midi,snd_seq_midi_event
ath9k                 132390  0 
snd_timer              29990  2 snd_pcm,snd_seq
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
mac80211              506816  1 ath9k
uvcvideo               72627  0 
snd                    78855  16 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
videodev               98259  1 uvcvideo
soundcore              15091  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
psmouse                87692  0 
joydev                 17693  0 
v4l2_compat_ioctl32    17128  1 videodev
serio_raw              13211  0 
ath9k_common           14053  1 ath9k
ath9k_hw              411112  2 ath9k,ath9k_common
ath                    24067  3 ath9k,ath9k_common,ath9k_hw
cfg80211              205544  3 ath9k,mac80211,ath
i915                  468651  3 
drm_kms_helper         46978  1 i915
drm                   242038  4 i915,drm_kms_helper
mei                    41616  0 
i2c_algo_bit           13423  1 i915
mxm_wmi                12979  0 
acer_wmi               28418  0 
sparse_keymap          13890  1 acer_wmi
video                  19596  1 i915
wmi                    19256  2 mxm_wmi,acer_wmi
mac_hid                13253  0 
lp                     17799  0 
parport                46562  3 parport_pc,ppdev,lp
usbhid                 47199  0 
hid                    99559  1 usbhid
tg3                   152032  0 
sdhci_pci              18826  0 
sdhci                  33205  1 sdhci_pci

Best Answer

Finally this worked for me.

gksudo gedit /etc/default/grub

Change the line:

GRUB_CMDLINE_LINUX=""

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Then run sudo update-grub and reboot.

(source)

Edit

This solution no longer works on 13.10 and 14.04.

A solution that does is creating an xorg configuration file:

In a terminal type sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf to create the file.
Followed by sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf to edit its content.
Then add the following content and save:

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"

EndSection

Log out and in again.

Source: Fix Brightness Control Not Working for Ubuntu 13.10 & 14.04

Ubuntu – Adjust Brightness 16.04

Until you find a better way, you should be able to set the brightness by editing /etc/sysfs.conf

Have a look in /sys/class/backlight to see what is there. I have (a symlink) intel_backlight but it could be radeon_b10 or something else depending on your hardware. In any case, inside it you should find a file called brightness which contains only a number that represents the current brightness. Make a note of the number! To change this value first make sure you have this package:

sudo apt install sysfsutils

then open the conf file with a text editor

sudo nano /etc/sysfs.conf

at the end of the file add a line like this:

class/backlight/intel_backlight/brightness = 4000

replace the path with the path to your brightness file (starting with class and no /), and replace 4000 with whatever number you think the brightness should be - my max brightness is 7812, so 4000 would make it about half as bright. Save the file and exit, then reboot. You will have to use trial and error to find the right brightness this way.

Here's where I learned how to do this

Best Answer

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Edit

Ubuntu – Adjust Brightness 16.04

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