Re: Bay Trail laptop fails to wake from S0ix suspend

On Fri, Jun 26, 2026 at 11:03:28PM -0400, [email protected] wrote:
> >Synopsis:	Bay Trail laptop fails to wake from S0ix suspend
> >Category:	amd64
> >Environment:
> 	System      : OpenBSD 7.9
> 	Details     : OpenBSD 7.9-current (GENERIC.MP) #42: Fri Jun 26 21:28:40 EDT 2026
> 			 [email protected]:/home/john/lenovo-80r2/src/sys/arch/amd64/compile/GENERIC.MP
> 
> 	Architecture: OpenBSD.amd64
> 	Machine     : amd64
> >Description:
> 	I'm unable to wake my Bay Trail Lenovo 80R2 (IdeaPad 100S-11IBY)
> 	after entering S0ix suspend. The last messages from syslog
> 	during suspend show that it does attempt to use S0:
> 
> Jun 26 21:52:05 humilitas apmd: system suspending
> Jun 26 21:52:05 humilitas apmd: battery status: CRITICAL. external power status: not connected. estimated battery life 0%
> Jun 26 21:52:06 humilitas /bsd: acpi0: S3 unavailable, using S0
> Jun 26 21:52:07 humilitas /bsd: drm : [drm] i915 raw-wakerefs=1 wakelocks=1 on cleanup
> Jun 26 21:52:08 humilitas dhcpleased[36124]: bpf_receive: read: Input/output error
> Jun 26 21:52:08 humilitas dhcpleased[60085]: deconfigure_interface: cannot find interface 3
> Jun 26 21:52:08 humilitas slaacd[40417]: delete_address: cannot find interface 3
> Jun 26 21:52:08 humilitas slaacd[40417]: delete_address: cannot find interface 3
> Jun 26 21:52:08 humilitas slaacd[40417]: failed to send route message: No such process
> Jun 26 21:52:09 humilitas /bsd: urtwn0 detached
> Jun 26 21:52:10 humilitas /bsd: video0 detached
> Jun 26 21:52:10 humilitas /bsd: uvideo0 detached
> Jun 26 21:52:11 humilitas /bsd: uhub1 detached
> 
> 	After this, my only option is to hard-reset the system.
> 
> 	Note that the dmesg doesn't report an S0ix sleep state.
> 	Apparently there's no _S0 package in the ACPI tables. Maybe
> 	that's a quirk of early "modern standby" systems, I'm not sure.
> 	It seems like it's just a cosmetic issue.

I suspect that is related to this being a "hardware reduced" ACPI.
from FADT:
                       Hardware Reduced (V5) : 1
                      Low Power S0 Idle (V5) : 1

> >How-To-Repeat:
> 	Close the lid or run `zzz'. The display turns off and the system
> 	drops off the network. Wait a few seconds and open the lid,
> 	press the power button or keys. The display does not turn on and
> 	there is no indication that the system has woken up.
> >Fix:
> 	The patch below allows bytgpio(4) controller interrupts to wake
> 	the system when any of its pins is listed in the controller's
> 	_AEI. This mirrors what's been done in amdgpio(4). With this
> 	patch I'm able to wake the system by opening the lid.

thanks, committed