Enabling brightness controls on my Asus laptop

[ryanch94]

Hi everyone,

I have Windows XP Pro 32 bit working perfectly on my Asus K55A laptop. The only thing that isn't working is the brightness controls. All the other controls using the Fn keys (volume, wireless switch, sleep, etc.) work fine. Normally I'd ignore this issue only that the display is just a small bit too dim for me and I'd like to increase the brightness one way or another. So if anyone knows how to enable the brightness Fn keys on this laptop or knows another way to increase the brightness I'd love to hear your suggestion.

Thanks!

[jaclaz]

Looong shot, but check how the monitor is seen in device manager:

http://visihow.com/Restore_Lost_Brightness_Control_app_in_ASUS_Laptops_After_Updating

If I get it right, the Fn+F5/F6/F7/F8 need not a driver but only work on some monitors with some ACPI settings because of conflicts with the "adaptive brightness":

https://www.asus.com/support/faq/1015071

The good Linux guys with this problem seemingly disable the "light sensor" ACPI0008 with an acpi_osi boot parameter:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1348890

Check also the exact PID/VID (or Prod/Ven) of the device you have, maybe there is some Asus driver for an earlier model with the same ID's.

jaclaz
 

[ryanch94]

Hi jaclaz,

The monitor is seen as a Plug and Play monitor, it has the ID DISPLAY\AUO26EC, which I couldn't find any driver for online, is there a way to disable the adaptive brightness on XP then?

[jaclaz]

1 hour ago, ryanch94 said:

Hi jaclaz,

The monitor is seen as a Plug and Play monitor, it has the ID DISPLAY\AUO26EC, which I couldn't find any driver for online, is there a way to disable the adaptive brightness on XP then?

The given resource:

http://visihow.com/Restore_Lost_Brightness_Control_app_in_ASUS_Laptops_After_Updating

suggests to "force" the use of the "Generic PNP Monitor", NOT the "PNP-Monitor (Standard)".

Have you tried that?

I was asking however if you have a device (the "ambient light sensor") connected to ACPI0008, and if yes, what was the ID of this sensor, it is a loong shot, but maybe a driver for it exists for XP.

jaclaz

[ryanch94]

4 hours ago, jaclaz said:

The given resource:

http://visihow.com/Restore_Lost_Brightness_Control_app_in_ASUS_Laptops_After_Updating

suggests to "force" the use of the "Generic PNP Monitor", NOT the "PNP-Monitor (Standard)".

Have you tried that?

I was asking however if you have a device (the "ambient light sensor") connected to ACPI0008, and if yes, what was the ID of this sensor, it is a loong shot, but maybe a driver for it exists for XP.

jaclaz

Unfortunately there doesn't appear to be an ambient light sensor connected to this PC (doesn't show up in device manager in Windows XP or 7, also no sensors are detected in Windows 7 control panel). I can't actually find the Generic PnP driver on Windows XP, I tried to use the Windows 7 Generic PnP driver in XP but it didn't work. Changing brightness works fine in 7, just not in XP

[jaclaz]

It's strange.

These kind of "Fn keys" utiltities are usually either "no driver needed" (because their functioning is embedded in BIOS) or "driver needed" (i.e. if the "special" driver for the keyboard is not installed all Fn functions such as brightness, contrast, volume, monitor switching, etc. don't work  at all).

The fact that only one of the Fn keys function does not work should mean that your laptop uses a "mixed mode".

Do you have the ATK0100 driver installed (on the XP)? (You should have an Unknown device in Device Manager if you have not)

In case it should be this one here:
http://dlcdnet.asus.com/pub/ASUS/nb/A6J/ATK0100_XP_061027.zip

At least page A-10 of the manual

http://www.asus.com/Notebooks/K55A/HelpDesk_Manual/

says so:
http://dlcdnet.asus.com/pub/ASUS/nb/K55VM/E7187_eManual_K55VM_K55VS_Z104.pdf

(but it could be a left-over for some other model, you never know with these crappy docs).

If all the above fails, then you may want to try an external program, such as (example) Pangobright:

http://www.pangobright.com/
 

jaclaz

 

[Dibya]

Anyone can help me in same matter for my compaq 620

[Mathwiz]

On Wednesday, December 14, 2016 at 6:33 PM, ryanch94 said:

Unfortunately there doesn't appear to be an ambient light sensor connected to this PC (doesn't show up in device manager in Windows XP or 7, also no sensors are detected in Windows 7 control panel). I can't actually find the Generic PnP driver on Windows XP, I tried to use the Windows 7 Generic PnP driver in XP but it didn't work. Changing brightness works fine in 7, just not in XP

Disregarding whether or not Windows detects a light sensor, is there one physically present on your laptop? Probably looks like a small hole somewhere around the display....

I'm one of those old "hardware guys" who'd be tempted to fix this problem by opening up the display case and soldering a trimmer potentiometer across the bloody thing. Then adjust brightness to taste
 

[Dibya]

38 minutes ago, Mathwiz said:

Disregarding whether or not Windows detects a light sensor, is there one physically present on your laptop? Probably looks like a small hole somewhere around the display....

I'm one of those old "hardware guys" who'd be tempted to fix this problem by opening up the display case and soldering a trimmer potentiometer across the bloody thing. Then adjust brightness to taste
 

. how much k ohms variable resistor you have used? My soldering iron is lying for long time.

[Mathwiz]

You should measure the resistance of the sensor with your thumb over it (so no light is reaching it) and use a potentiometer of similar or slightly larger resistance.
 

[Dibya]

10 hours ago, Mathwiz said:

You should measure the resistance of the sensor with your thumb over it (so no light is reaching it) and use a potentiometer of similar or slightly larger resistance.
 

After long time multimeter going to do some work . I have one old dell laptop partly broken lying somewhere . Its time to do exsperiment