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**SteveRiley** · Sep 04, 2014, 11:06 PM

Please run sudo lshw -C display and paste the output here. It's helpful if we know what kind of video hardware you have. Also, is your computer a laptop or desktop? If laptop, what brand and model?

**rcmandar** · Sep 05, 2014, 05:04 PM

Hey thanks man!

Here you go this is the output you requested:

Code:

madmandy@Kubook:~$ sudo lshw -C display
[sudo] password for madmandy: 
  *-display               
       description: VGA compatible controller
       product: GK107M [GeForce GT 645M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list
       configuration: driver=nvidia latency=0
       resources: irq:47 memory:d2000000-d2ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:3000(size=128)
  *-display
       description: VGA compatible controller
       product: 3rd Gen Core processor Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:44 memory:d3000000-d33fffff memory:e0000000-efffffff ioport:4000(size=64)

Yes and its a lenovo laptop Z500.

Thanks again.

**SteveRiley** · Sep 05, 2014, 06:51 PM

Ah, yet another laptop with hybrid graphics. For the nVidia part, you need the follwing lines in /etc/X11/xorg.conf:

Code:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection

If the file doesn't exist, create it and copy those lines. If the file already exists, then locate the nvidia device section and add the option line shown.

**rcmandar** · Sep 06, 2014, 02:05 AM

doesn't work.

Code:

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0@0:2:0"
    Option "AccelMethod" "SNA"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1@0:0:0"
    Option "ConstrainCursor" "off"
    Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

is this right?

**SteveRiley** · Sep 06, 2014, 04:34 PM

Yes, that's right. Did you reboot?

It could be that the Intel graphics is controlling your primary display. In that case, you need to edit the file /etc/default/grub and add the following kernel boot parameter: acpi_backlight=vendor

**rcmandar** · Sep 07, 2014, 04:48 AM

Dude so much appreciate your effort to help me. However, it has not worked out.

I did add the option you mentioned to /etc/default/grub:

my grub:

Code:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
GRUB_INIT_TUNE="480 440 1"


#### added for backlight by madmandy ###
acpi_backlight=vendor

and ran

Code:

sudo update-grub

still no juice!

**rcmandar** · Sep 07, 2014, 11:39 AM

I believe the popup is the work of something called powerdevil. For the same kde has config file named powerdevilrc i have it ~/.kde/share/config/powerdevilrc.

Now i read in a thread, a guy had problems with kwin re rmed the kwinrc and replaced it by kwin --replace.
powerdevil --replace doesn't exist.

will reinstalling powerdevil and/or replacing powerdevilrc will help?

**Snowhog** · Sep 07, 2014, 11:43 AM

You didn't add the parameter correctly.

Edit /etc/default/grub again. Remove the entries you made. Then edit the following entry in the file:

GRUB_CMDLINE_LINUX=""

so it reads:

GRUB_CMDLINE_LINUX="acpi_vendor=vendor"

Save and close then run:

sudo update-grub

**Snowhog** · Sep 07, 2014, 11:47 AM

Originally posted by rcmandar View Post

I believe the popup is the work of something called powerdevil. For the same kde has config file named powerdevilrc i have it ~/.kde/share/config/powerdevilrc.

Now i read in a thread, a guy had problems with kwin re rmed the kwinrc and replaced it by kwin --replace.
powerdevil --replace doesn't exist.

will reinstalling powerdevil and/or replacing powerdevilrc will help?

This has nothing to do with the question this thread is about. Why did you post this? Did you intend to ask another question in a new thread?

**rcmandar** · Sep 10, 2014, 02:09 PM

No no... Doesn't work...

I tried putting in acpi_vendor=vendor in quotes or the acpi_backlight=vendor...
i did update-grub. i, of course, did reboot.

I just want to see brightness changing with the popup bar same like it used. It used to do same thing like volume thing.
Volume changes fine using hotkeys and it also shows the current status by pop up. Also if i click on battery in my system tray, the brightness level is actually different but, in text it shows 30% even though the bar is at different position. I m so annoyed by this.

Plz help!

**Teunis** · Sep 10, 2014, 03:02 PM

Still assuming you run the nVidia card the text in /tex/X11/xorg.conf should be:

Section "Device"
Identifier "Default Device"
Option "RegistryDwords" "EnableBrightnessControl=1"
Option "NoLogo" "True"
EndSection

At least, this is what works on my W520.
If this isn't present you can still change brightness by logging in on a console (like Ctrl+Alt+F4) and use the key's there.
Press Ctrl+Alt+F8 to return to the normal screen.

The brightness control on Intel works out of the box.

**rcmandar** · Sep 10, 2014, 04:12 PM

yeah yeah... i have this:

Code:

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0@0:2:0"
    Option "AccelMethod" "SNA"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1@0:0:0"
    Option "ConstrainCursor" "off"
    Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

brightness control is there! But no popup!

**rcmandar** · Sep 18, 2014, 01:35 AM

Hey guys,

m still down with this problem!

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Brightness hotkey not working

Brightness hotkey not working

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