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Old 04-20-2013, 01:28 AM   #1
gdizzle
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Brightness in Centos 6.4??? asus laptop.....


Brightness in Centos 6.4???

Went to a new library today and to my suprise they had the freaken lights turned on high beam everywhere!

Dazed and confused I looked everywhere for a in various menus: "Appearance", "Assistive Technologies", "Deskop Effects (unavaliable)", brightness menu and could not locate on in Centos 6.4 Gnome.

I ended up turning down the brightness on my Laptop with the function keys only in the BIOS Menu, as the function keys did not work in Centos.

Downloaded and played around with gconf-editor and there are many brightness options so I managed to get nothing working.

Has anyone with a laptop managed to turn down the brightness in Centos 6.4 using the software and not the function keys?

Is there a utility I can get which does this??

I am using an ASUS A55A...there are some examples on the Net using proc but for different models....

Tried this:

found an example here:
reduce screen brightness to 50 or less, for example:

Code:
xbacklight -set 50
No outputs have backlight property

Please tell me I am missing something obvious....


More info:

Code:
uname -r

2.6.32-358.2.1.el6.x86_64

Code:
lspci -v 

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. Device 2102
	Flags: fast devsel, IRQ 16
	Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at f000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel modules: i915
Code:
ll -l /sys/class/backlight/
total 0
Code:
xrandr -q 

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768
default connected 1368x768+0+0 0mm x 0mm
   1366x768        0.0  
   1368x768        0.0* 

xrandr --brightness 50 : had issues setting this hmmmmm
Thanks
 
Old 04-20-2013, 11:39 AM   #2
goumba
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https://bbs.archlinux.org/viewtopic.php?id=132347

See post #14, the kernel parameters to pass at boot. This worked for me. If it doesn't for you, there are a bunch of other suggestions.
 
Old 04-20-2013, 05:24 PM   #3
gdizzle
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Tried
Code:
acpi_osi=Linux
OR
Code:
backlight=vendor
on the Kernel boot line made no difference.

Tried laptop mode tools and played with the brightness,nothing changed and I think this is because it depends on directives in:
Code:
/sys/class/backlight
which mine is empty.

sigh....

Thanks either way.
 
Old 04-21-2013, 05:20 AM   #4
goumba
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One other possibility, is that your kernel is too old and does not have the necessary modules. Can you try a newer kernel?
 
Old 04-21-2013, 05:06 PM   #5
gdizzle
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It's all good I will just settle for the BIOS for now, It's looks to also be a known issue with the Asus laptops and the function keys in Linux.

It's the latest kernel from Centos I really cannot be bothered compiling and making a new kernel regarding to this.

Either way thanks for your help!
 
  


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