ubuntu-x-swat team mailing list archive

[Delyan Kalchev <delyank@xxxxxxxxx>]

Hello. I've just tested the option you had mentioned. It successfully
forces the driver to control the brightness. But the only way to change
it is using the slider in the Power Management windows (in
System->Preferences). Using the function keys does not change the
brightness. Only the notification appears (so the key pressing is surely
detected) but nothing changes - neither in the progress bar in the
notification, nor the brightness itself.  The Brightness applet in the
panel refuses any change, either. It is completely the same when I
remove the proprietary driver, the only difference is that without the
proprietary driver the resolution is wrong and cannot be set to normal.
I cannot imagine why the applet is not working. I can also use (when
root) a command like

 echo 80 > /proc/acpi/video/DGFX/LCD/brightness

and it sets the brightness

When using the slide to set the brightness I can NOT detect any buzz or
humming. Probably it is specific effect on ThinkPad's hardware or
because I do not use keys to set the brightness degree, so no hardware-
confusing values appear. Either way a fix is needed.

I'm attaching my logs for comparison. Those with "_no" in the name are
without the proprietary driver, and the ones with "_yes" are with it.

** Attachment added: "logs.tar.gz"
   http://launchpadlibrarian.net/49039821/logs.tar.gz

-- 
Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers
https://bugs.launchpad.net/bugs/562005
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which is subscribed to nvidia-graphics-drivers in ubuntu.