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ailijic / easy-slow-down-manager

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kernel 2.6.37-ARCH on Samsung N510 - No backlight dimming anymore #9

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. Install the newest kernel26 / kernel26-headers package on arch linux 
(2.6.37.3-1)
2. Install easy-slow-down-manager
3. Try to dim backlight using /proc/acpi/video/IGPU/LCD0/brightness

What is the expected output? What do you see instead?
There is no /proc/acpi/video/IGPU/LCD0/brightness

What version of the product are you using? On what operating system?
32-1 (latest svn version; AUR package easy-slow-down-mangager-svn)
I'm having a Samsung N510 netbook

Please provide any additional information below.
Problem appeared the first time when arch linux upgraded to a 2.6.37 kernel. On 
2.6.36, there was no problem.

Original issue reported on code.google.com by tim.tg.g...@gmail.com on 11 Mar 2011 at 11:55

GoogleCodeExporter commented 9 years ago 
Do you have 'acpi_backlight=vendor' option in your kernel parameters?
Does samsung_backlight module loads properly (look for kernel messages)?

Original comment by SergeyK...@gmail.com on 4 Apr 2011 at 3:57

GoogleCodeExporter commented 9 years ago 
these parameters don't work.
I also don't have any errors while boot (except an address space collision, but 
that also appears without loading samsung_backlight module.

But I found a way dimming the backlight by manipulating 
/sys/class/backlight/samsung/brightness

Original comment by tim.tg.g...@gmail.com on 17 Apr 2011 at 12:20