proposal: set default lid state to S3, performance/economy Cx states to Cmax

[Rui Paulo]

On May 4, 2014, at 1:27, Adrian Chadd <adrian at FreeBSD.org> wrote:

> * Flipping the default lid state to S3. I think ACPI suspend/resume
> seems to work well enough these days and I've not met anyone lately
> who expects the default from their laptop to be "stay awake with the
> lid shut."

The sysctl is really just a hack.  We should have a much better mechanism for integrating our ACPI with the X11 desktop environments.  GNOME/KDE/Mate don't understand our sysctl and get confused easily. 

You can turn it on by default, but I'm sure ACPI suspend/resume is not working well enough like you say.  How many laptops have you tested?  For completeness, how many desktops?  

There are bunch of ports kernel modules that will crash your system if you suspend.  VirtualBox is one of them.

> * Save chip bugs that we should add workarounds for, we should be OK
> to enter lower sleep states when idling. Flipping this may expose some
> further crazy driver, platform or timer bugs, but they again likely
> should be fixed.

They are still not fixed.  Some of these problems are not in FreeBSD though and I don't expect us to be able to work around them.  We should try to identify systems where C3 has surprising effects and blacklist them.

--
Rui Paulo