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Please I am new to ubuntu 14.04 and i can't adjust my screen brightness. I'm using HP Pro book-450-G2. but i dual boot the ubuntu with windows 10 and my brightness can be adjusted in windows 10.

Selikem v 0.1.0
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You can install xbacklight with sudo apt-get install xbacklight, and then try xbacklight -set 10.

If that does not work, then open up the folder /sys/class/backlight/ and see if there are any entries. If not, then you probably don't have your video drivers installed.

Edit: OK, the following seems to have worked for OP: Brightness setting not working on Xubuntu 15.04 ( vivid vervet)

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mkdrive2
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  • Please, i tried it and it didn't work, but there are entries in /sys/class/backlight. the entries are acpi and intel. – Selikem v 0.1.0 Feb 13 '16 at 16:58
  • @RichmondSelikemChris-Koka: Could you please see if 
    tee /sys/class/backlight/intel/brightness <<< 5
    or 
    tee /sys/class/backlight/acpi/brightness <<< 5
    works?     – mkdrive2 Feb 13 '16 at 17:20
  • Please I tried the Brightness setting not working on Xubuntu 15.04 and it is now WORKING!!!!!!!!!. yaay. I'm so happy. thank you and God bless you. – Selikem v 0.1.0 Feb 13 '16 at 17:21
  • Please i need one more thing. – Selikem v 0.1.0 Feb 13 '16 at 17:22
  • I can't connect to wifi networks. I can only use an ethernet cable for internet connections. there's no option for me to even see available wifi – Selikem v 0.1.0 Feb 13 '16 at 17:23
  • @RichmondSelikemChris-Koka: You could ask a separate question, but if you don't want to, could you please tell the output of lspci | grep -i wireless? – mkdrive2 Feb 13 '16 at 17:27
  • please this is the output : 09:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter @mkdrive2 – Selikem v 0.1.0 Feb 13 '16 at 17:30
  • @RichmondSelikemChris-Koka: Are you using the standard Unity desktop of Ubuntu or a different one? If you are using Unity: At the upper right corner you should have something like this http://fs5.directupload.net/images/160213/o93bmdwt.png. After you have unplugged the ethernet cable, do you see the second symbol in the picture? Are you unable to configure wifi with it? What have you tried? Sorry, I cannot ask you these questions here, because I don't have enough rep, yet. – mkdrive2 Feb 13 '16 at 18:56