Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1000270
Title:
Laptop backlight brightness increases/decreases 2 steps each time
Status in “gnome-power-manager” package in Ubuntu:
Confirmed
Bug description:
Hi,
I have a Lenovo 3000 N200 laptop which uses a Nvidia Geforce Go 7300
graphics chip.
I noticed this issue in Lubuntu 11.10 with the Nvidia binary driver
and also after booting a Xubuntu 12.04 CD (using the Nouveau driver
there I think). As far as I can remember, this issue wasn't present
with either Ubuntu 8.04 or Xubuntu 9.10.
The laptop has 8 possible backlight brightness settings. At the
desktop, increasing or decreasing brightness (by pressing Fn-F10 or
Fn-F11) causes the brightness to increase or decrease by 2 steps
instead of 1. However, in text mode -- after switching with Ctrl-
Alt-F1 -- changing brightness works as it should, in single steps.
I noticed that the page
http://forum.notebookreview.com/acer/434638-linux-acer-1410-1810tz-1810t.html
mentions a fix for a similar issue with Acer laptops. That fix adds a line to
/etc/rc.local:
echo N > /sys/module/video/parameters/brightness_switch_enabled
Applying that to my laptop fixed the screen brightness double-stepping
at the desktop, so now changing brightness works as it should. However
after doing that, the brightness cannot be changed at all when in text
mode.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1000270/+subscriptions
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