As chrmhoffmann suggested, this bug may be the same as
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296
The workaround mentioned there works on my laptop. There is still some delay
(0.1s max), but almost unnoticeable!
Also of possible interest. On my system I have three devices of class
backlight:
ls -l /sys/class/backlight/
total 0
lrwxrwxrwx 1 root root 0 Jun 12 14:17 acpi_video0 -
../../devices/pci:00/:00:01.0/:01:00.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 Jun 12 13:39 acpi_video1 -
** Tags added: precise
** Summary changed:
- Adjusting display brightness is very slow on Dell E5410 with Natty.
+ Adjusting display brightness is very slow on several Dell laptops
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This bug also affects me with 12.04. I have a Dell E6520 with
Intel+NVidia (optimus). I see different timings than Sparhawk
This happened both with a fresh installation, and after installing
bumblebee. In both cases optimus was ON in the bios, but in the former
case the system was falling back
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