Put CPUs in the lowest P-state just before the final suspend step. The

firmware probably does this for us on ACPI systems with proper S3 support,
but this doesn't happen on systems where we park CPUs in a low-power idle
state ourselves.

ok deraadt@

diff --git a/sys/kern/subr_suspend.c b/sys/kern/subr_suspend.c
index 58f8ef5..ad156f9 100644 (file)
--- a/sys/kern/subr_suspend.c
+++ b/sys/kern/subr_suspend.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: subr_suspend.c,v 1.13 2022/11/05 19:29:46 cheloha Exp $ */
+/* $OpenBSD: subr_suspend.c,v 1.14 2022/11/10 10:37:40 kettenis Exp $ */
 /*
  * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com>
  * Copyright (c) 2005 Jordan Hargrave <jordan@openbsd.org>
@@ -142,6 +142,9 @@ top:
                boothowto |= RB_POWERDOWN;
                config_suspend_all(DVACT_POWERDOWN);
                boothowto &= ~RB_POWERDOWN;
+
+               if (cpu_setperf != NULL)
+                       cpu_setperf(0);
        }
 
        error = gosleep(v);