This issue is still present in Saucy. I have seen it happen with many
laptops, including the HP Compaq 6910p laptop on which I am typing this.
It spans across multiple Ubuntu releases. My deduction is that the
brightness events are processed by two different recipients which
creates the problem.
Same issue on my Thinkpad X201 (Ubuntu 13.04 64bits). I also noticed that if I
click on an entry of the menu bar of any application (for example File menu of
Firefox), then use the function buttons to increase/decrease brigthness :
1. Brigthness is increased/decreased in single steps.
2. The
After installing 3.5.0-18-generic in Ubuntu 12.04 Precise from official
repository it seems to be fixed on my Thinkpad T500.
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It seems that echo N /sys/module/video/parameters/brightness_switch_enabled
does help when decreasing the brightness, but when you increase it still goes
up in 2 step.
Still, waiting for the fix.
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-power-manager (Ubuntu)
Status: New = Confirmed
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Same problem on Ubuntu 12.04 (3.2.0-26-generic) and Thinkpad T500
echo 0 | sudo tee /sys/module/video/parameters/brightness_switch_enabled
or
echo 4 /proc/acpi/ibm/cmos
echo 5 /proc/acpi/ibm/cmos
works - ~9 brightness steps instead of ~5 steps
dmesg: thinkpad_acpi: detected a 8-level
Same here. How do we change the stepping of screen brighteness thingie in X11?
Text mode goes correctly from 0 to 8 here, but gnome changes it steps of 2.
Thanks.
** Package changed: ubuntu = gnome-power-manager (Ubuntu)
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Try adding the line shown above to /etc/rc.local, that fixed the
brightness changes in X11 for me. Now it moves 1 step at a time in X11,
however the brightness cannot be changed at all when not in X11! (That
is, in text mode pressing the brightness up/down key has no effect.)
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