Screen brightness not changing

I recently formatted my system with windows 8 64-bit and after installing all the drivers, my screen brightness doesnt change

Hi GregA_154,
Try reinstalling your graphics drivers from your ProBook 4540s driver page.  If that doesn't work then you have two options.  You can try the Commercial Notebook forum because your model is a commercial product to see if anyone there has anything additional for you to try.  The second option would be to contact HP.  You can contact HP Total Care at 1-800-474-6836 in North America or start here if you live outside of North America.
Please click “Accept as Solution ” if you feel my post solved your issue.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Thank you,
BHK6
I work on behalf of HP

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    ++Please click KUDOS / White thumb to say thanks
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    I have been trying for a few hours to get my screen brightness to work properly. I'm on an ASUS Zenbook Prime UX31A with kernel 3.9.6-1. I'm using efibootmgr to boot.
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    Last edited by tobit (2013-06-30 02:37:30)

    WonderWoofy wrote:
    Because you are entering it in a shell, you need to escape some of the things in the acpi_osi="!Windows 2012" string.  So for example, the double quotes are intended to be entered exactly as is in the resulting efibootmgr entry, so these should be esacped since they would otherwise have a special meaning in the command line.  The same is true for the exclamation point.  So I think you would have to do:
    efibootmgr -c -w -d /dev/sda -p 1 -L "Arch Linux" -l '\EFI\arch\vmlinuz-arch.efi' -u "initrd=/EFI/arch/initramfs-arch.img root=UUID=d0b32080-84f0-4c6b-933b-f62b880afc09 ro rootfstype=ext4 efi_no_storage_paranoia elevator=noop acpi_osi=\"\!Windows 2012\" add_efi_memmap"
    BTW, this is just a copy/paste of one of the entries above (slightly fixed).  I added a '/' to your initrd entry, as it is supposed to be an absolute path, not a relative one.
    Edit: I too started out with a direct efibootmgr entry when getting to know UEFI.  But I think that a better solution is to use a boot manager.  I like gummiboot, but I also keep rEFInd set up as well.  By doing this, if you ever want to chane something on your kernel command line, you can just edit the config before reboot.  But I think that were it is really useful is if you need to modify the kernel command line before you boot, as it is not possible with a direct efibootmgr entry.  If you want to make it seem seamless, just set the timeout to zero in efibootmgr, and then if you want to get to the menu, you just hold the spacebar while booting. 
    The reason I wanted to use a direct efibootmgr entry was because I thought it would be faster.  But because gummiboot and systemd will actually give you the time it takes to boot which includes the time in the firmware (POST) as well as the time it takes to get through the boot manager, I have actually found that my system takes a whole 14ms from the end of POST to starting to load the kernel.
    Edit2: BTW, I also quoted the entire srting of arguments on the kernel command line, which it need in order to be fed to the '-u' option as a single string.
    I'm afraid that still doesn't work. I've tried similar things and tried that specifically.  In case you're wondering, the command you listed gives me the following output:
    $ sudo efibootmgr -v
    BootCurrent: 0000
    Timeout: 2 seconds
    BootOrder: 0000
    Boot0000* Arch Linux HD(1,800,96000,bee2185e-de97-4dc0-9614-830639991bc3)File(\EFI\arch\vmlinuz-arch.efi)i.n.i.t.r.d.=./.E.F.I./.a.r.c.h./.i.n.i.t.r.a.m.f.s.-.a.r.c.h...i.m.g. .r.o.o.t.=.U.U.I.D.=.d.0.b.3.2.0.8.0.-.8.4.f.0.-.4.c.6.b.-.9.3.3.b.-.f.6.2.b.8.8.0.a.f.c.0.9. .r.o. .r.o.o.t.f.s.t.y.p.e.=.e.x.t.4. .e.f.i._.n.o._.s.t.o.r.a.g.e._.p.a.r.a.n.o.i.a. .e.l.e.v.a.t.o.r.=.n.o.o.p. .a.c.p.i._.o.s.i.=.".\.!.W.i.n.d.o.w.s. .2.0.1.2.". .a.d.d._.e.f.i._.m.e.m.m.a.p...
    I also tried putting the -u argument in single quotes so that I don't have to escape the double quotes or the !. That also didn't work. Thanks for your suggestions, I'd be happy to try more, I've tried a lot already to no avail :-(
    count0 wrote:On my Asus X201E, the screen brightness keys only work when I add "acpi_osi=" to my kernel parameters, with no arguments. You could try that.
    That's the third option I say that I tried in my original post.

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    Hi  ,
    Thank you for visiting the HP Forums! A great place where you can find solutions for your issues, with help from the community!
    I came across your post about the Notebook, and wanted to assist you! I have looked into your issue about your HP 15-r014tx Notebook and issues with not being able to adjust the brightness levels. Here is a link to the HP Support Assistant if you need it. Just download and run the application and it will help with the software and drivers on your system  that might need updating. As this could cause the slider Brightness bar missing from the Notebook. If that does not help try in the Device Manager.Select the Display Adapters in the list on the center of your screen.
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