Ubuntu: Brightness controll not working in lenovo g580 [duplicate]



Question:

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my laptop is lenovo g580. Configuration is CPU : Intel® Core™ i3-2370M CPU @ 2.40GHz × 4 GPU : Nvidia geforce 610M Kernel Linux 3.5.0-17-generic

My problem is that I cannot control the screen brightness. When I try to control the brightness using (Fn + up/down) the pop-up notification on the right top of the screen comes but the brightness does not change.

When I installed ubuntu for the first time the brightness control worked properly. But after the first reboot brightness not changing. Then I installed kernel 3.5. After that also the brightness control worked properly. But after the first reboot brightness not changing.

Now I observed that brightness control works well after the very first reboot of kernel update (update-initramfs -u).

What may be the reason? Thanks in advance.


Solution:1

Even I had the same problem. For brightness control edit the grub.cfg file like given below and reboot. Now u will be able to use the keys. Note: the code you need to edit is highlighted.

menuentry 'Linux Mint 13 Cinnamon 64-bit, 3.2.0-23-generic (/dev/sda6)' --class linuxmint --class gnu-linux --class gnu --class os {      recordfail      gfxmode $linux_gfx_mode      insmod gzio      insmod part_msdos      insmod ext2      set root='(hd0,msdos6)'      search --no-floppy --fs-uuid --set=root 193c42e2-847f-42e9-9798-bca4c2b9597d      linux   /vmlinuz-3.2.0-23-generic root=UUID=6304e339-3f61-4aac-be29-fbf7a252b37f ro **acpi_backlight=vendor**      initrd  /initrd.img-3.2.0-23-generic  }  

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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