I cannot adjust brightness of my laptop HP g4 1351tx. My lshw -c display output.
*-display UNCLAIMED description: VGA compatible controller product: GF119M [GeForce 610M] 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: latency=0 resources: memory:d0000000-d0ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:4000(size=128) *-display UNCLAIMED description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated 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 configuration: latency=0 resources: memory:d1000000-d13fffff memory:c0000000-cfffffff ioport:5000(size=64)There must be something wrong with my driver. Because the nvidia display card and intel display card are both UNCLAIMED
I've searched for a long time and tried a lot of methods to fix it. For example, I modified the /etc/default/grub file, and also added a /usr/share/X11/20-intel.conf and a /etc/X11/xorg.conf, but none worked. And my /sys/class/backlight directory is empty.
I've also tried to reinstall the nvidia driver, after that I can login, but there was just a wallpaper left on the desktop and I cannot get any response by mouse click or keyboard. Finally I reinstalled Ubuntu. Maybe I have chosen the wrong driver?
Now I use the Nouveau display driver from xserver-org-video-nouveau and still cannot adjust the brightness. Any answer may help me.
1 Answer
I fixed it yesterday.
I just changed the driver version to Nvidia binary driver 331.113 by KDE system control panel.
By the way, I uninstalled the gnome desktop and installed the KDE instead.
The driver I selected doesn't work on gnome desktop, but works fine on KDE, I don't know why.
And after that I found that my nvidia display card was claimed while the Intel display card was still unclaimed. However, the brightness still couldn't be adjusted.
I kept searching for that and finally removed the boot parameter "nosplash nomodeset". I added the parameter when I installed the ubuntu and without it ubuntu couldn't boot.
Since I've changed the open source driver to the nvidia closed source driver and my desktop environment runs smoothly.
There's no need to adding the parameter so I removed it.
In some way, the parameter must be removed once I selected the correct driver so that the Intel display card can be claimed.
That means, if I don't select the correct driver and my display cards are unclaimed, I must use the parameter "nosplash nomodeset" to make ubuntu boot normally.
