Le 10/10/2013 11:11, Rik Theys a écrit :
I've experienced similar behaviour since the 3.9 kernels on my Dell Latitude 6530 Adding the following kernel parameter to the grub boot line has dramatically reduced the latency for me: acpi_backlight=vendor It might also make a difference for you.
Thanks. Indeed, acpi_backlight=vendor reduces drastically the latency for me too.I obtain better results by adding also acpi_osi=Linux. With only acpi_backlight=vendor, the backlight was jumping a level : when I press on my keyboard shortcut, the blacklight dims, ... and dims again. With acpi_osi option, backlight dims only once.
So my problem is solved. Thanks again Bye Pw