I encountred the same trouble with HP nc6400 laptop.
I was able to switch the backlight off with this command: sudo vbetool dpms
standby
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https://bugs.launchpad.net/bugs/19410
Changed state to fix released, given Guy's comment re this being fixed
with Edgy drivers.
** Changed in: acpi-support (Ubuntu)
Status: Needs Info = Fix Released
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Laptop backlight does not turn off
https://launchpad.net/bugs/19410
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Unfortunately the latest Edgy updates as at today have not not fixed
this for me. I'm running a Toshiba notebook with S3 Savage.
Running 'xset dpms force off' makes the screen go black but the
backlight stays on (it doesn't even turn off for a second), and just a
few seconds later the screen
Same problem of yours with an hp nx7400 notebook (intel 945gma).
xset dpms off
shuts down the backlight for a few seconds.
Only vbetool dpms off shuts down backlight really.
I tried on debian etch (similar packages, same i810 driver, same notebook) the
problem is not present.
It's a bug related
BTW, I changed my launchpad account a bit, I'm the original reporter
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Laptop backlight does not turn off
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Fixed in the Nvidia drivers that came with Edgy (HP ZV5174EA)
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Laptop backlight does not turn off
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I have same kind of problem in Kubuntu Edgy.
Hardware: HP omnibook vt6200, ati mobility radeon. Video driver is ati (issue
is also with vesa driver). Laptop backlight stays always on. Screen blanking
only makes display black but backlight stays on.
If I switch backlight off with xset dpms force
