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

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi David,

David H. Gutteridge wrote:
> 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.)

The T420 is a lot newer and is amd64 instead of x86.

> 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.)

Yes, I have this issue on the T43 with ATI graphics, however it often 
does work and come back (but takes several secons) it is unreliable, but 
the only ThinkPad I have NetBSD on which sometimes suspends/resumes 
correctly.

Did you try disabling video in configure and then trying to 
suspend/resume after a clean boot?

Christos suggested to me disabling video and audio (things in my 
experience cause issue too).
I tried also fine-grained disabling based on dmesg devices.

However, I went down to bare-bones, leaving just internal hard disk and 
keyboard - disabling everything which I could (but perhaps I missed 
something) and yet it fails!

> 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.

Indeed, I did all the test with a just clean-booted machine with no USB 
mouse, keybord, dongles or else.

It did not help.

Riccardo