Envy 14: display backlight controls don't work do not Linux

Hello

I am running Linux on my HP Envy 14 (kernel 2.6.34). The backlight of the screen always remains 100% light even on battery or using a power energy efficient plan, sucking my dry battery without delay.

Obviously, brightness controls do not work. I had a look at/proc/acpi/video had a look at the information of brightness, but only records there are GFX0 and PEGP, none of them contains a subfolder of the LCD. :-(

It seems that the brightness information is stored in:

  • GFX0/DD01/brightness
  • GFX0/DD02/brightness
  • PEGP/DD01/brightness
  • DD02/PEGP/brightness

Writing '50' in these files (for 50% brightness) does not change the brightness. Interesting detail: xbacklight now ISC brightness was 50%, but it's not. Directly with xbacklight brightness adjustment does not work.

I suspect that this is a problem of switchable graphics or BIOS.

Any suggestions?

Good news, everyone! I compiled the last openSUSE 11.3 kernel 2.6.34 and applied the maintainer of Ubuntu kernel patches and now I had controls backlight works, yay!

Use this patch: http://kernel.ubuntu.com/~kamal/i915_brightness/

The patch will be I hope that part of the 2.6.36 kernel.

I currently monitor the use of the power with codebase and disable unnecessary energy consumers. I managed to bring my notebook of > full power 50W now ~ 21W.

Just a quick note (because there were some suspicions): CPU throtteling works on battery, core i5 - 520 M CPU is strangled 2.4 GHz at 1 .2GHz.

Any comparison with the energy consumption of Windows?

Tags: Notebooks

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