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-   -   Screen backlight never goes off (http://www.nvnews.net/vbulletin/showthread.php?t=184851)

cumthsc 06-22-12 11:28 AM

Screen backlight never goes off
 
The machine is a Dell Latitude E6410 with NVS 3100M controller. I'm using
kernel-3.4.3-1.fc17.x86_64 (though the kernel version doesn't seem to matter) and nVidia driver 295.59 (installed from RPM Fusion).

The problem is that the screen never goes to sleep. It does blank, but the backlight remains on forever.

Is this a setting that I can't find, or is it a driver bug?

The nouveau driver doesn't have this particular problem.

TIA.

brebs 07-05-12 09:17 PM

Re: Screen backlight never goes off
 
The kernel 3.4 series seems to need:

acpi_backlight=legacy

In the bootloader's (e.g. grub, lilo, syslinux) commandline, so we can use e.g.:

Code:

echo 8 > /sys/class/backlight/acpi_video0/brightness
To check:
Code:

cat /proc/cmdline


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