I think this issue is cause by some bug in the BIOS of HP laptop.
The OS control the hardware by running some AML(ACPI machine language) code in
the BIOS, but some bug prevent the lid switch from working properly.
To solve this issue we have 3 choice:
1. Block the video.ko by adding a line in the /etc/modprobe.d/blacklist as
below:
blacklist video
The drawback of this method is that you will lose some function provide by
the acpi/video, such like the notification of display switch, brightness change
etc.
2. modify the kernel code and re-compile it:
find the video.c in the drivers/acpi directory in the kernel source tree,
open it. Find the code as below:
static int acpi_video_bus_start_devices(struct acpi_video_bus
*video)
{
return acpi_video_bus_DOS(video, 0, 0);
}
change it to :
static int acpi_video_bus_start_devices(struct acpi_video_bus
*video)
{
return acpi_video_bus_DOS(video, 1, 0);
}
Then re-compile and install the modified kernel and modules, after
rebooting you will find that the lid switch works.
3. Export the DSDT of the laptop, modify it and override it in the kernell:
I don't think this is a good method. The DSDT is different from computer
to computer, so maybe my hack to the DSDT is not suitble for you.
--
Lid switch don't work on hp NC6000 laptop
https://bugs.launchpad.net/bugs/321153
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