[SOLVED] Brightness issue -- ASUS 1001p

[rokytnji]

For infos sake since I really do not know what to say next in this thread.
The location for backlight info in linux-lite is in



I am lost because Chris_OC tried the recommended grub kernel argument parameters to get his brightness working
but said

I searched the web and found references to this problem with other versions of Linux revolving around editing the line GRUB_CMDLINE_LINUX_DEFAULT. I found two different edits, written as follows:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

...and I tried both (separately, of course) but neither made any difference. Linux Lite tells me that brightness is at maximum, and changing it doesn't make the screen dimmer.

Sorry Chris. I am out of ideas on this one.

[Chris_OC]

Thanks anyway -- I appreciate your looking into it.

Just FYI, I took a look at the three "brightness" files there (actual, max, and just plain brightness) and they all read 125. This might explain why I don't get any changes with the brightness plug-in, but I don't know how to edit them, or if that's even possible. I found that I can't make changes from the File Manager; I can edit them, but they won't save from there.

[rokytnji]

Yeah, something is not right

try

Code:

sudo echo 1000 > /sys/class/backlight/intel_backlight/brightness

Just to see if things get brighter or dimmer.

Mine is at

Code:

harry@harry-Latitude-XT2:~$ cd /sys/class/backlight/intel_backlight/
harry@harry-Latitude-XT2:/sys/class/backlight/intel_backlight$ ls
actual_brightness  bl_power  brightness  device  max_brightness  power  subsystem  type  uevent
harry@harry-Latitude-XT2:/sys/class/backlight/intel_backlight$ cat max_brightness
39780
harry@harry-Latitude-XT2:/sys/class/backlight/intel_backlight$ cat actual_brightness
39780
harry@harry-Latitude-XT2:/sys/class/backlight/intel_backlight$

whose values are way higher than yours.

[rokytnji]

Here is hoping I am on to something

Code:

harry@harry-Latitude-XT2:~$ cat /var/log/Xorg.0.log | grep backlight
[    24.159] (--) intel(0): found backlight control interface acpi_video0 (type 'firmware')

You might be missing acpi_video0 maybe?

In case you are wondering where I am getting my flaky ideas.

http://rog.asus.com/forum/showthread.php...s-In-Linux

http://www.linlap.com/linlap.com?do=search&id=asus+1000

[Chris_OC]

Yeah, something is not right

try

Code:

sudo echo 1000 > /sys/class/backlight/intel_backlight/brightness

Just to see if things get brighter or dimmer.

I get "permission denied" -- how do I bypass that?

[rokytnji]

Try it as root then

Code:

sudo -s

login. You should get a # prompt. Instead of $. Then

Code:

echo 1000 > /sys/class/backlight/intel_backlight/brightness

without the sudo.

[Chris_OC]

You might be missing acpi_video0 maybe?

I have this: /sys/class/backlight/acpi_video0$ -- the system adds the $ sign.

And your ideas are not flaky, at least that I can tell. I know next to nothing about this stuff, so I'm in no position to judge, at any rate.

EDIT: I got permission, but now the command

Code:

echo 1000 > /sys/class/backlight/intel_backlight/brightness

gives me an write error for invalid argument.

[rokytnji]

The 1000 number was a wild guess on my part with the low number you gave earlier so that is why probably the invalid argument kicked in.

[Chris_OC]

What does that number refer to? I tried lower numbers just for the heck of it, and that didn't seem to make any difference.

[rokytnji]

The number refers to what I gather from below

http://askubuntu.com/questions/149054/ho...via-script