Ubuntu 12.04lts.

Before 3.x.x this bug could be solved by echo '1' >
/proc/acpi/video/..../DOS. But now /proc/acpi/video folder is deprecated
and does not exists. Solution does not work. At least I could not find
anything "DOS" related in /sys/class folder. So
/proc/acpi/button/lib/.../state is always 'open'.

Does anyone know workaround or solution for 3.x.x kernels? Thanks in
advance.

Btw, does anyone know which part of the system caused this problem? Some
kernel module?

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https://bugs.launchpad.net/bugs/277534

Title:
  No action when closing screen on HP 530

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