Brightness problem

[Evgenyi]

Hello, I have the same problem as a guy had - http://ubuntuforums.org/showthread.php?t=2088190
But I haven't got any folders in /sys/class/backlight.
It disappeared after I made manipulation with that instruction:
1. Open a terminal (Program - Accessories - Terminal)
2. Type in "sudo gedit /etc/default/grub" (without the "")
3. Find the line that says: GRUB_CMDLINE_LINUX="quiet splash"
4. Edit it so it says: GRUB_CMDLINE_LINUX="quiet splash acpi_backlight=vendor"
5. Save and exit
6. Run the command "sudo update-grub" (again without quotes of course)
7. Reboot and enjoy!

here is information that were asked:

BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=6af82d53-e87d-480c-b345-b346a96c109e ro quiet splash acpi_backlight=vendor
1
/sys/class/backlight/*
cat: /sys/class/backlight/*/brightness: No such file or directory
cat: /sys/class/backlight/*/max_brightness: No such file or directory

Sony Corporation
VPCEH1L1R


01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF119M [GeForce 410M] [10de:1055] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Sony Corporation Device [104d:908b]
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 4000 [size=128]
[virtual] Expansion ROM at d3080000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel

video/brightnessup BRTUP 00000086 00000000 K
sony/hotkey SNY5001:00 00000001 00000011
sony/hotkey SNY5001:00 00000001 0000003b
video/brightnessdown BRTDN 00000087 00000000 K
sony/hotkey SNY5001:00 00000001 00000010
sony/hotkey SNY5001:00 00000001 0000003b

Please help me, my eyes promise

[raja.genupula]

http://askubuntu.com/questions/149054/how-to-change-lcd-brightness-from-command-line-or-via-script/149265#149265

[Toz]

Evgenyi,

Can you remove the acpi_backlight=vendor kernel parameter, re-run "sudo update-grub" and reboot your computer (to get it back to the state it was before).

Then, can you run the following commands in a terminal window and post back the results:
1. Your current kernel boot line:

cat /proc/cmdline
2. Information about your video card(s):

lspci -k | grep -iA2 VGA
3. Information about your known backlight interfaces:

for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done
4. A listing of your loaded kernel modules:

lsmod
5. Your /var/log/Xorg.0.log file:

pastebinit /var/log/Xorg.0.log
...and post back the link that is generated.

[Evgenyi]

BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=6af82d53-e87d-480c-b345-b346a96c109e ro quiet splash quiet splash


01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [GeForce 410M] (rev a1)
Subsystem: Sony Corporation Device 908b
Kernel driver in use: nvidia


/sys/class/backlight/acpi_video0
15
15
15


Module Size Used by
ctr 13049 2
ccm 17773 2
pci_stub 12622 1
vboxpci 23194 0
vboxnetadp 25670 0
vboxnetflt 27613 0
vboxdrv 339502 3 vboxnetadp,vboxnetflt,vboxpci
cuse 13445 3
rfcomm 69160 8
bnep 19624 2
binfmt_misc 17468 1
joydev 17381 0
snd_hda_codec_hdmi 46207 1
uvcvideo 80885 0
videobuf2_vmalloc 13216 1 uvcvideo
videobuf2_memops 13362 1 videobuf2_vmalloc
videobuf2_core 40664 1 uvcvideo
videodev 134688 2 uvcvideo,videobuf2_core
intel_rapl 18773 0
x86_pkg_temp_thermal 14205 0
intel_powerclamp 14705 0
coretemp 13435 0
kvm 451511 0
crct10dif_pclmul 14289 0
crc32_pclmul 13113 0
arc4 12608 2
ghash_clmulni_intel 13259 0
snd_hda_codec_conexant 57441 1
cryptd 20359 1 ghash_clmulni_intel
btusb 32412 0
psmouse 102222 0
bluetooth 395423 22 bnep,btusb,rfcomm
serio_raw 13462 0
ath9k 164164 0
ath9k_common 13551 1 ath9k
ath9k_hw 453856 2 ath9k_common,ath9k
ath 28698 3 ath9k_common,ath9k,ath9k_hw
mac80211 626489 1 ath9k
rtsx_pci_ms 18151 0
memstick 16966 1 rtsx_pci_ms
snd_seq_midi 13324 0
lpc_ich 21080 0
snd_seq_midi_event 14899 1 snd_seq_midi
cfg80211 484040 3 ath,ath9k,mac80211
snd_rawmidi 30144 1 snd_seq_midi
snd_hda_intel 52355 5
snd_hda_codec 192906 3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_ intel
snd_hwdep 13602 1 snd_hda_codec
snd_pcm 102099 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_seq 61560 2 snd_seq_midi_event,snd_seq_midi
nvidia 10675249 52
sony_laptop 54219 0
snd_seq_device 14497 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_page_alloc 18710 2 snd_pcm,snd_hda_intel
drm 302817 2 nvidia
video 19476 0
snd_timer 29482 2 snd_pcm,snd_seq
snd 69238 21 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_cod ec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_co dec,snd_hda_intel,snd_seq_device,snd_seq_midi
mei_me 18627 0
mac_hid 13205 0
mei 82274 1 mei_me
soundcore 12680 1 snd
parport_pc 32701 0
ppdev 17671 0
lp 17759 0
parport 42348 3 lp,ppdev,parport_pc
hid_logitech_dj 18581 0
usbhid 52616 0
hid 106148 3 usbhid,hid_logitech_dj
rtsx_pci_sdmmc 23274 0
r8169 67581 0
mii 13934 1 r8169
ahci 25819 2
rtsx_pci 45956 2 rtsx_pci_ms,rtsx_pci_sdmmc
libahci 32168 1 ahci

http://paste.ubuntu.com/7382405/

[Evgenyi]

It doesn't work

[Toz]

Lets try this first:

If the /etc/X11/xorg.conf file exists, add:

Option "EnableBrightnessControl=1"
...to the "Device" section of that file.

If the file does not exist, then with root privileges, create the file /usr/share/X11/xorg.conf.d/20nvidia.conf with the following content:

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 410M"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Log out and back in again to test. If something goes wrong, simply delete that file and reboot to recover the system.

[Evgenyi]

I typed gedit /etc/X11/xorg.conf
There was an empty file.
I used the second variant and ,,,
Amazing! It works!