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Old 04-06-2010, 06:16 AM   #1
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brightness control issue?

laptop -compag-610
I cant able to control the brightness of my laptop.
Please advice me.

Is there any way to control (reduce ) the brightness.

Old 04-06-2010, 08:13 AM   #2
John Lumby
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On some thinkpads, the kernel supports altering brightness of the laptop monitor via acpi. I am not sure if yours is included (if not you would have to consult the manufacturer) but try this

1. ensure that the CONFIG_ACPI_VIDEO and CONFIG_VIDEO_OUTPUT_CONTROL kernel config parms are both set in your running kernel

2. Now (after rebooting if necessary) do this
find /proc/acpi -name brightness -ls

If that found a file (or files), then for each file, cat the file to see what it contains. If you are lucky it may contain either some instructions on how to alter the brightness of a single number.
If the latter, then try
echo number >file
where the number you put is a little (not too far) lower or higher than what was currently there, and see if you notice a change.

If this works, this is a (awkward) way of doing it and you could then experiment with binding an acpi event to some keypress (hotkey) to perform the echo command as an action.

Old 04-06-2010, 10:12 AM   #3
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Try hardware...

Look for a small sun symbol on your "+" and "-" or "up" and "down" arrow keys. Press one of these while pressing the "Fn" key to regulate the brightness.

Last edited by thorkelljarl; 04-06-2010 at 10:16 AM.
Old 04-13-2010, 10:58 PM   #4
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This didn't helped me.
I need to reduce the brightness ,when the POWER ON (charger plugged In).
Or you can say that i need enable the Power saver to ON always ,Am i clear?

Originally Posted by thorkelljarl View Post
Try hardware...

Look for a small sun symbol on your "+" and "-" or "up" and "down" arrow keys. Press one of these while pressing the "Fn" key to regulate the brightness.


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