Re: Totally broken PCI PM calls

[David Brownell]

On Monday 11 October 2004 3:12 pm, Stefan Seyfried wrote:
> David Brownell wrote:
> 
> > The machines I've tested with relatively generic 2.6.9-rc kernels
> > don't use BIOS support for S4 when I call swsusp.
> 
> first do either
> echo platform > /sys/power/disk     # for S4
> echo shutdown > /sys/power/disk     # for poweroff
> 
> then do
> echo disk > /sys/power/state

Oddly enough, neither of them work lately for me.
They each resume immediately after writing the
image to disk.

- Dave

p.s. I find the /sys/power/disk file mildly cryptic, maybe
    other folk will find the attached patch slightly more
    informative about what this interface can do.



--- 1.19/kernel/power/disk.c	Thu Sep  9 08:45:13 2004
+++ edited/kernel/power/disk.c	Fri Oct  1 11:01:41 2004
@@ -282,7 +282,14 @@
 
 static ssize_t disk_show(struct subsystem * subsys, char * buf)
 {
-	return sprintf(buf,"%s\n",pm_disk_modes[pm_disk_mode]);
+	return sprintf(buf,"%s%s %s%s %s%s\n",
+		(pm_disk_mode == pm_ops->pm_disk_mode) ? "*" : "",
+			pm_disk_modes[pm_ops->pm_disk_mode],
+		(pm_disk_mode == PM_DISK_SHUTDOWN) ? "*" : "",
+			pm_disk_modes[PM_DISK_SHUTDOWN],
+		(pm_disk_mode == PM_DISK_REBOOT) ? "*" : "",
+			pm_disk_modes[PM_DISK_REBOOT]
+		);
 }