High! I've just installed Linux to my old Laptop Sony Vaio VGN-SZ7 (aka PCG-6W4P) and discovered strange behavior: When the lid is closed - acpi does not know about it, acpi_listen doesn't output anything, but such script: while true; do sleep 1; cat /proc/acpi/button/lid/LID0/state; done outputs closed or opened, regarding to lid physical state. That means that lid works and recognized by linux kernel, but acpi doesn't catch lid events. Also: $ dmesg |grep -i lid [ 0.757188] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input1 [ 0.758805] ACPI: Lid Switch [LID0] [ 3.376265] input: AlpsPS/2 ALPS GlidePoint as /devices/platform/i8042/serio1/input/input4 Bug report https://bugzilla.kernel.org/show_bug.cgi?id=111261 Similar thread on forum http://ubuntuforums.org/showthread.php?t=2197872 Kernel version 4.2 (tested on 2.6.32 (ubuntu 8.04) - the same story). Different distros result the same. Kind regards, Yan