Mageia forum

Hi,

For some reason the function of automatic dimming of the display doesn't work on my laptop. Actually, it had never worked under Mandriva 2010, but it did when I ran Zenwalk from a LiveCD, so it doesn't seem to be completely hopeless
Where should I look for the cure?
Asus laptop, Intel graphics, Mageia1 x86_64. Brightness keys work (with minor troubles). Automatic sleep/wake are OK.

Thank you.

You could at least post the model of your laptop.

It is Asus P50IJ:
http://www.asus.com/Commercial_Notebooks/P50_Series/P50IJ/#specifications
Almost the same configuration as described.

Can you try to add acpi=ht to the boot options next time you boot?

Which desktop are you using?

Do you have the asus-laptop module installed?
To check

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lsmod | grep asus

To install

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modprobe asus-laptop

To load automatically at boot add a line
asus-laptop
to /etc/modprobe.preload

With the module installed these commands should set the brightness level

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echo 1  > /sys/devices/platform/asus-laptop/ls_switch
echo 15  > /sys/devices/platform/asus-laptop/ls_level

Thank you for your help!

I am using KDE.
Here is what I have:

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# lsmod | grep asus
asus_laptop                 19955  0
sparse_keymap           13898  1 asus_laptop
rfkill                            26083  2 cfg80211,asus_laptop

So the module is in place.

Is it possible to edit corresponding configuration files to set the proper brightness instead of running those commands?
BTW, I do not have these files:
ls_switch
ls_level
in
/sys/devices/platform/asus-laptop/

doktor5000 wrote:Can you try to add acpi=ht to the boot options next time you boot?

Do you mean to turn off ACPI completely? I can do it via Boot settings in MCC I guess. I will try it.

Is it possible to edit corresponding configuration files to set the proper brightness instead of running those commands?
BTW, I do not have these files:
ls_switch
ls_level

You can put the commands in /etc/rc.local and they will execute at the end of the boot sequence.
Do the commands work? I would expect you would need to have /sys/devices/platform/asus-laptop/ls_level present for them to work.

You might also check

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dmesg | grep asus

to get some clue as to what is happening.

zugunder wrote:

doktor5000 wrote:Can you try to add acpi=ht to the boot options next time you boot?

Do you mean to turn off ACPI completely? I can do it via Boot settings in MCC I guess. I will try it.

Nope, i meant exactly what i wrote. This leaves only stable ACPI functions enabled.

Also please show the output of

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find /proc | grep -i brightness

and

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find /sys | grep -i brightness

doctor5000
I added a parameter acpi=ht to the boot options in MCC > Boot > Set up boot system and restarted the system.
I did not notice any difference - though I still can change screen brightness via function keys, no display dimming and no brightness changes when I toggle between different power profiles.
As for the outputs, here they are:

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# find /proc | grep -i brightness
# find /sys | grep -i brightness
/sys/devices/virtual/backlight/acpi_video0/brightness
/sys/devices/virtual/backlight/acpi_video0/actual_brightness
/sys/devices/virtual/backlight/acpi_video0/max_brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::radio/brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::radio/max_brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::assoc/brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::assoc/max_brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::tx/brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::tx/max_brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::rx/brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0::rx/max_brightness
/sys/module/video/parameters/brightness_switch_enabled

Thank you.

djennings

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# dmesg | grep asus
asus_laptop: Asus Laptop Support version 0.42
asus_laptop:   P50IJ model detected
asus_laptop: Backlight controlled by ACPI video driver
input: Asus Laptop extra buttons as /devices/platform/asus_laptop/input/input6

To be honest, I do not see any useful info here - apart from that ACPI controls backlight and my laptop model is recognized correctly. Just the way it should be, right?

Do you suggest to create those 2 files manually and put values 1 and 15 into them? Sorry, I am not a programmer, but it is the way I understood those 2 commands you mentioned.

Thank you.

So is it correct that the problem is because the display backlight is controlled by ACPI, but not by asus-laptop module? Does it mean that the asus module does not support backlight control itself and relies on ACPI in that?

Hi,

So does everything looks normal? Or did I ask anything totally stupid?