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[Hooman Baradaran <599607@xxxxxxxxxxxxxxxxxx>]

... and is there a way to set a minimum value so the screen doesn't go dark?
0x01000 is a reasonable medium. Very dark but slightly readable.
0x00500 makes the screen almost completely dark.

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nvidia-bl-dkms 0.16.10 Blank screen on brightness change
https://bugs.launchpad.net/bugs/599607
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Status in Mactel Support: New

Bug description:
I have a Sony Vaio VPCCW21FX (Nvidia 310M) running Lucid.

After I installed nvidia-bl-dkms 0.16.10, the brightness buttons showed the brightness indicator but it didn't move.
Manually writing values to /sys/class/backlight/nvidia_backlight/brightness turn the backlight completely off (the backlight only turned back on after a suspend/resume).

Then I copied sony brightness scripts from here:

http://ubuntuforums.org/showthread.php?t=1420341

... after that, using the brightness buttons on the laptop turned the screen off as well.