Closing the lid does not generate an ACPI signal

[Arman]

HP Pavilion dv4-2165dx Laptop
OS Version: 12.04.1 LTS

closing the lid does not cause the machine to suspend as per settings in power management

Summary:

using acpi_listen to check for events:

pressing the power button generates the output:

 "button/power PWRF 00000080 00000018"

closing and opening the lid generates no output;

however, if the power button is pressed again, the following output is produced:

"button/power PWRF 00000080 00000019
button/lid LID0 00000080 00000009"

when pressed again:

"button/power PWRF 00000080 0000001a
button/lid LID0 00000080 0000000a"

a third time:

"button/power PWRF 00000080 0000001b"

thus it seems that the acpi signal for the lid is not registered unless another acpi event occurs

so a workaround is to connect the machine to AC power, close the lid, and remove the AC power. this causes the machine to suspend successfully, with acpi_listen producing the following output:

"button/lid LID0 00000080 0000000f
ac_adapter AC 00000080 00000000"

Thanks!

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alf HP Lund (alf-c)]

I am on a Toshiba Satellite p850 running Ubuntu Studio 16.04

Just closing the lid will not suspend (regardless of settings), while closing the lid and removing the power cable will successfully suspend the machine.

ACPI readings similar to those described in OP.