problem with suspend to disk on linux2.6-t9

problem with suspend to disk on linux2.6-t9

[dodger]

hi
i am using linux2.6-t9 and i am trying to use suspend to disk
when doing a
< echo -n "disk" > /sys/power/state >

it is suspending real fine.
but it is not resuming at all.
i tried to boot up normally and with resume=/dev/hdb5 ( swap partition ) but 
nothing happens...

it just boots up normally...
i have set /dev/hdb5 as DEFAULT RESUME PARTITION during kernel config...

any ideas?
thanks

Re: problem with suspend to disk on linux2.6-t9

[Måns Rullgård]

dodger <shoxx@web.de> writes:

> it is suspending real fine.
> but it is not resuming at all.
> i tried to boot up normally and with resume=/dev/hdb5 ( swap partition ) but 
> nothing happens...

Try disabling the drive write cache with "hdparm -W0 /dev/hdb" before
suspending.  It did the trick for me, as well as curing some other
obscure problems.

-- 
Måns Rullgård
mru@kth.se

Re: problem with suspend to disk on linux2.6-t9

[Rob Landley]

On Monday 17 November 2003 16:27, dodger wrote:
> hi
> i am using linux2.6-t9 and i am trying to use suspend to disk
> when doing a
> < echo -n "disk" > /sys/power/state >
>
> it is suspending real fine.
> but it is not resuming at all.
> i tried to boot up normally and with resume=/dev/hdb5 ( swap partition )
> but nothing happens...
>
> it just boots up normally...
> i have set /dev/hdb5 as DEFAULT RESUME PARTITION during kernel config...
>
> any ideas?
> thanks

Hmmm...  Looking at my dmesg from the last boot up (which was a clean boot and 
not a resume from suspend), it doesn't seem like the suspend code prints out 
anything when it's checking for a resume image.  (On the other hand, the APIC 
code prints out three screenfulls of useless trivia.  Fun...)

Patrick: is there some kind of debug switch we can set to make it more 
verbose?  (I don't see one in the code.  I'm going to be sprinkling in 
printks myself as soon as my rebuild sans preempt finishes...)

Rob

Re: problem with suspend to disk on linux2.6-t9

[Rob Landley]

On Monday 17 November 2003 16:27, dodger wrote:
> hi
> i am using linux2.6-t9 and i am trying to use suspend to disk
> when doing a
> < echo -n "disk" > /sys/power/state >
>
> it is suspending real fine.
> but it is not resuming at all.
> i tried to boot up normally and with resume=/dev/hdb5 ( swap partition )
> but nothing happens...
>
> it just boots up normally...
> i have set /dev/hdb5 as DEFAULT RESUME PARTITION during kernel config...
>
> any ideas?
> thanks

Did you specify a default resume partition (CONFIG_PM_DISK_PARTITION) in your 
.config?  (Or provide it with the kernel parameter pmdisk=/dev/blah)...

On suspend, it saves to the first mounted swap file.  On resume, it hasn't 
looked at /etc/fstab yet to see where the swap files are by the time it gets 
to resuming, and nobody's bothered to code up any heuristic for what to do 
with no default partition, so you have to point it at a partition or it won't 
attempt to resume.

Personally, I think that 99% of the time you can just iterate through the 
partitions of whatever drive your root device lives on and find the first one 
that's got a valid suspend signature on it, and resume from that.  (And if 
you don't find one, don't resume.)  The few cases where this isn't 
appropriate can configure another default or supply a kernel command line 
paramenter, but having to bake your swap partition location into the kernel 
config is a bit klunky at best...

Of course with lilo, there's a user space alternative, you know.  Your suspend 
script could call lilo -R with a command line that points to the partition 
you're about to suspend to.  But there are a number of problems with that 
(ideally you want to do it right AFTER suspending...)  And I dunno if grub's 
got an equivalent...

One thing that might be nice is if there was a way to trigger a resume from 
the initramfs.  "Blow away the current process list and load this binary 
image of what userspace should look like."  That way figuring out where the 
sucker lives is a problem you could punt on. :)

Rob

Re: problem with suspend to disk on linux2.6-t9

[dodger]

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On Tuesday 18 November 2003 14:18, Rob Landley wrote:
> Did you specify a default resume partition (CONFIG_PM_DISK_PARTITION) in
> your .config?  (Or provide it with the kernel parameter
> pmdisk=/dev/blah)...

yes i did.
i tried to suspend with disabled hdb write cache ( hdparm -W0 /dev/hdb ) and 
it suspended and resumed fine.
exept for my network device wasnt running...is there a way to fix this?
i`ll try to do   ifdown before suspending and ifup after resuming, but is 
there a way to resume properly without that?

dodger
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Re: problem with suspend to disk on linux2.6-t9

[Pavel Machek]

Hi!

> One thing that might be nice is if there was a way to trigger a resume from 
> the initramfs.  "Blow away the current process list and load this binary 
> image of what userspace should look like."  That way figuring out where the 
> sucker lives is a problem you could punt on. :)

This is doable, but rather hard. Way too hard for 2.6.X, anyway.
									Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]