Re: Sleep problems in kernel 2.6 from mvista.com

[Domingo Fiesta Segura <linuxdummybudy@yahoo.es>]

El Lunes, 1 de Diciembre de 2003 05:54, Benjamin Herrenschmidt escribió:
> It's indeed strange, I would have expected this config to work fine.

I've also been trying enabling I2C with similar results.

> Do you have X running ? Same problem if not ? Does the screen come back
> up at all or not ?

I've been doing some more tests and the results are random. I tried three 
ways of suspending the machine:

1.- Closing the lid (pmud).
2.- Issuing the snooze command (pmud-utils).
3.- Some code I've been playing with some time ago [See below].

The results using (1) and (2) are the same (wether I use the -f option in 
(2) or not). It always goes to sleep fine, but when waking up it can 
happen one or more of the following things:

* The screen doesn't turn on
* The screen turns on but moving garbage lines appear and the console 
columns are shifted to the right (a few places). In X there's only moving 
garbage.
* Network doesn't response (so I can't login through ssh and reboot), not 
even to pings.
* Keyboard doesn't response (so I can't issue the reboot command).
* Maybe it wakes up correctly (very few times).
* I always hear the CD-ROM initial spin (the same as booting).

If I use (3) the screen doesn't turn off but that could be a coding 
mistake.

If you want me to do any particular test or try some kernel configuration 
(enabling debugging or so), I would be very please to help comunity; I'm 
not worried at all about losing data because everything is mirrored in a 
desktop machine.

Thanks for your interest.

Here's some code:
=== sleep.c ===
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include <linux/types.h>
#include <linux/pmu.h>

int main(void)
{
	int fd;
	
	fd = open("/dev/pmu", 0);
	if (fd < 0)
		return 1;
	sync();
	ioctl(fd, PMU_IOC_SLEEP, 0);
	close(fd);
	return 0;
}
=== ===

P.S: I always wondered where the kernel developers or the system daemons 
(i.e. pbbuttonsd and pmud) developres found the ADB and PMU specs to 
interact with the respective devices.