Re: ThinkPad - suspend-to-RAM intel-x86 issues and tests

["David H. Gutteridge" <david%gutteridge.ca@localhost>]

On Wed, 14 Nov 2018, at 13:10:55 +0100, Riccardo Mottola wrote:
>HI all,
>
>I take the discussion started on a similar thread on netbsd-users over here, since it is still a "current" issue and to debug it I am using netbsd-GENERIV kernels from RelEng.
[...]
>
>the question is again.. suggestions on what to disable, if you have patch suggestions, etc.

FWIW, I'm able to get suspend and resume to work reliably on a Lenovo
T420 with NetBSD-8.0_STABLE. (With 8.99.x, it doesn't work as reliably
because the SATA driver seems to have issues after resumption which
don't occur with 8.0.) I didn't have to do anything of note to get it
to work, it just does, assuming there's nothing extra attached. (Read
on below.)

On the other hand, I cannot get it to work on a Lenovo x131e (the AMD
CPU version, with Radeon graphics). With that machine, it resumes, but
the display stays dark. (This behaviour is consistent with most Linux
kernels I've tried as well, so there's something tricky about it.)

One other thing to consider is whether you have anything extra plugged
into the USB stack when you're trying to suspend. I've found having
pretty much anything plugged in (including a mouse) causes my T420 to
fail to completely suspend.

Regards,

Dave