Re: Hibernate and lack of docs

2014-11-12 Thread poma
On 09.11.2014 23:38, Martín Marqués wrote:
 Hi all,
 
 I was trying to get hibernation working on my F20 laptop with which I work.
 
 Going through the process, which I thought would be more transparent
 or that it would just be like hitting the hibernation and that's it, I
 found great deficiencies in Fedora (maybe just from the kernel) and
 especially in the docs (or the lack of documentation in this
 particular issue):
 
 1) I had trouble getting the system to hibernate. There wasn't
 anything clear about the fact that you needed to have a swap bigger
 than the amount of memory you have. Also, it doesn't work if you have
 a file as swap (which was the easiest way to start testing)
 
 2) You need (or at least with my laptop) to add the resume=swap FS,
 this I did find information in the docs, but I'm a bit surprised that
 Fedora doesn't give better information about all this during the
 installation process.
 
 3) When adding the resume= option to the kernel line in grub you can't
 use UUID like FS. That is a bug IMHO.
 
 Well that's as much as I remember now.
 
 At least I now have hibernation working correctly on my laptop.
 
 Regards,
 

https://www.kernel.org/doc/Documentation/usb/power-management.txt
https://www.kernel.org/doc/Documentation/power/states.txt
https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
https://01.org/linuxgraphics/documentation/how-debug-suspend-resume-issues-0
https://wiki.ubuntu.com/Kernel/Reference/S3
https://wiki.ubuntu.com/Kernel/Reference/S4


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Re: Hibernate and lack of docs

2014-11-11 Thread Roberto Ragusa
On 11/11/2014 05:48 AM, Tim wrote:

 It does if you want to suspend/hibernate to the swap space.  Your RAM
 has to dump its contents somewhere, and that's where it goes.

Then consider that swap space is not there doing nothing and just awaiting
your hibernating.
Some of it could be really in use at the moment you hibernate.

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Re: Hibernate and lack of docs

2014-11-11 Thread Tim
Tim:
 It does if you want to suspend/hibernate to the swap space.  Your RAM
 has to dump its contents somewhere, and that's where it goes.

Roberto Ragusa:
 Then consider that swap space is not there doing nothing and just awaiting
 your hibernating.
 Some of it could be really in use at the moment you hibernate.

Which would be managed by the OS as the system hibernates...  And,
there's the thing about having *more* swap space than RAM, so there is
some wiggle room.

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Re: Hibernate and lack of docs

2014-11-11 Thread Sudhir Khanger
On Tuesday, November 11, 2014 03:18:29 PM Tim wrote:
 It does if you want to suspend/hibernate to the swap space.  Your RAM
 has to dump its contents somewhere, and that's where it goes.

I wonder if it creates an image of the whole RAM available to the system or a 
snapshot of actual RAM being used by the system. That would change things.

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Re: Hibernate and lack of docs

2014-11-11 Thread poma
On 11.11.2014 21:50, Sudhir Khanger wrote:
 On Tuesday, November 11, 2014 03:18:29 PM Tim wrote:
 It does if you want to suspend/hibernate to the swap space.  Your RAM
 has to dump its contents somewhere, and that's where it goes.
 
 I wonder if it creates an image of the whole RAM available to the system or a 
 snapshot of actual RAM being used by the system. That would change things.
 

https://wiki.ubuntu.com/Kernel/Reference/S4


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Re: Hibernate and lack of docs

2014-11-10 Thread Martín Marqués
2014-11-09 20:31 GMT-03:00 Pete Travis li...@petetravis.com:


 Please file a bug[1] against the documentation you're referencing,
 probably the Power Management Guide?  That will help the guide
 coordinator ensure that the issue is appropriately addressed. Point 1)
 seems especially relevant, that much should be explicitly clear.

Will do so. Just wanted to get some impressions here before filing a bug.

 fwiw, it seems like hibernation is generally falling out of favor these
 days.  I know not everyone has newer systems, but those that do have
 machines that use shockingly little power on suspend, and cold boot
 faster than a resume from hibernate could ever achieve.

I had a Dell laptop a which I bought about 4 years ago. I almost
always suspended it (no hibernation) and when it got to 14 months
(warrant was over) it died (hard die, like in motherboard chip got
fried).

The guy in Dell told me not to suspend the laptop, at least not for
long periods of time, which really surprised me.

About cold boot, well even if the cold boot is fast, there is lots of
things I need to get starting before I start to work (ssh keys, login
to monitoring systems, etc) which make a cold boot extremely tiresome.

 On point 3, one would hope that resuming from hibernate didn't require
 you to manually edit the grub configs every time :)  I'm not well versed
 in the area, but it smells like at least one bug/deficiency  from here.

This looks like a kernel bug, as you can specify a boot partition
using UUID, so why not the one to resume from.

 [1]
 http://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/pr01s02.html

Thanks.


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Re: Hibernate and lack of docs

2014-11-10 Thread Bob Marcan
On Mon, 10 Nov 2014 10:36:27 -0300
Martín Marqués mar...@2ndquadrant.com wrote:

 2014-11-09 20:31 GMT-03:00 Pete Travis li...@petetravis.com:
 

 About cold boot, well even if the cold boot is fast, there is lots of
 things I need to get starting before I start to work (ssh keys, login
 to monitoring systems, etc) which make a cold boot extremely tiresome.
 

You can achieve this with pm-suspend or pm-suspend-hybrid.

BR, Bob
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Re: Hibernate and lack of docs

2014-11-10 Thread Pete Travis

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

On 11/10/2014 06:36 AM, Martín Marqués wrote:
 2014-11-09 20:31 GMT-03:00 Pete Travis li...@petetravis.com:


 Please file a bug[1] against the documentation you're referencing,
 probably the Power Management Guide?  That will help the guide
 coordinator ensure that the issue is appropriately addressed. Point 1)
 seems especially relevant, that much should be explicitly clear.

 Will do so. Just wanted to get some impressions here before filing a bug.
I see the bug - thanks!

 fwiw, it seems like hibernation is generally falling out of favor these
 days.  I know not everyone has newer systems, but those that do have
 machines that use shockingly little power on suspend, and cold boot
 faster than a resume from hibernate could ever achieve.

 I had a Dell laptop a which I bought about 4 years ago. I almost
 always suspended it (no hibernation) and when it got to 14 months
 (warrant was over) it died (hard die, like in motherboard chip got
 fried).

 The guy in Dell told me not to suspend the laptop, at least not for
 long periods of time, which really surprised me.

Post hoc, ergo propter hoc?  I've had Dell laptops from then, older,
newer.  Suspend triggered by lid close was the normal disuse state for
all, with periodic hard halts due to battery depletion :)  Generally,
some laptops fail, and some don't - unless there's an explicitly clear
impetus, ie prolonged dirty power or physical damage, there's a lot of
speculation involved.  It seems to be more common with machines equipped
with heat-producing dedicated graphics, so I avoid them.


 About cold boot, well even if the cold boot is fast, there is lots of
 things I need to get starting before I start to work (ssh keys, login
 to monitoring systems, etc) which make a cold boot extremely tiresome.

 On point 3, one would hope that resuming from hibernate didn't require
 you to manually edit the grub configs every time :)  I'm not well versed
 in the area, but it smells like at least one bug/deficiency  from here.

 This looks like a kernel bug, as you can specify a boot partition
 using UUID, so why not the one to resume from.

 [1]

http://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/pr01s02.html

 Thanks.

Sure, just because hibernation has 'fallen out of favor' doesn't mean
you shouldn't expect it to work :)  The kernel devs are good about
triage, filing a bug there would be a good start even if the kernel
isn't directly at fault (systemd, maybe?)

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Re: Hibernate and lack of docs

2014-11-10 Thread Fred Smith
On Mon, Nov 10, 2014 at 09:42:07AM -0700, Pete Travis wrote:
 
 -BEGIN PGP SIGNED MESSAGE-
 Hash: SHA1
 
 On 11/10/2014 06:36 AM, Martín Marqués wrote:
  2014-11-09 20:31 GMT-03:00 Pete Travis li...@petetravis.com:
snip
  I had a Dell laptop a which I bought about 4 years ago. I almost
  always suspended it (no hibernation) and when it got to 14 months
  (warrant was over) it died (hard die, like in motherboard chip got
  fried).
 
  The guy in Dell told me not to suspend the laptop, at least not for
  long periods of time, which really surprised me.
 
 Post hoc, ergo propter hoc?  I've had Dell laptops from then, older,
 newer.  Suspend triggered by lid close was the normal disuse state for
 all, with periodic hard halts due to battery depletion :)  Generally,
 some laptops fail, and some don't - unless there's an explicitly clear
 impetus, ie prolonged dirty power or physical damage, there's a lot of
 speculation involved.  It seems to be more common with machines equipped
 with heat-producing dedicated graphics, so I avoid them.
 
 
  About cold boot, well even if the cold boot is fast, there is lots of
  things I need to get starting before I start to work (ssh keys, login
  to monitoring systems, etc) which make a cold boot extremely tiresome.
 
  On point 3, one would hope that resuming from hibernate didn't require
  you to manually edit the grub configs every time :)  I'm not well versed
  in the area, but it smells like at least one bug/deficiency  from here.
 
  This looks like a kernel bug, as you can specify a boot partition
  using UUID, so why not the one to resume from.
 
  [1]
 
 http://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/pr01s02.html
 
  Thanks.
 
 Sure, just because hibernation has 'fallen out of favor' doesn't mean
 you shouldn't expect it to work :)  The kernel devs are good about
 triage, filing a bug there would be a good start even if the kernel
 isn't directly at fault (systemd, maybe?)

Agreed, it SHOULD work, wherver possible (within constraints of weird/
broken hardware).

I sometimes need to shut down a machine (laptop or desktop) temporarily
while I have important stuff open or otherwise in progress, and do not
want to lose it. Suspend isn't always suitable because you can't unplug
a desktop to move it while in suspend, unless you don't mind losing
what you're doing. And of course, if I NEEDED hibernate, suspend just
wouldn't do.

As a programmer myself, I understand (painfully, too often) that for
any arbitrary situation one might find oneself stuck in, that some of the
more attractive choices just won't do, and the really useful choice can
be painful, so I DO have sympathy for people who would like to deprecate
hibernate because the hardware situation is a big mess.

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Re: Hibernate and lack of docs

2014-11-10 Thread Sudhir Khanger
On Mon, Nov 10, 2014 at 4:08 AM, Martín Marqués mar...@2ndquadrant.com wrote:
 1) I had trouble getting the system to hibernate. There wasn't
 anything clear about the fact that you needed to have a swap bigger
 than the amount of memory you have. Also, it doesn't work if you have
 a file as swap (which was the easiest way to start testing)

I don't think swap size has to be bigger than size of RAM. Arch Linux
has a good note on size of swap partition [1] which links to kernel
documentation[2]. I used to make 4GB of swap partition on a system
with 8GB of RAM on Arch Linux. Anaconda makes 7.6GB of swap partition
on same machine.

Swap file does support hibernating. Again refer to Arch Linux wiki [3].

I have tried both of the above scenarios myself. I have switched to
Fedora and I use btrfs filesystem, so, I can't provide any more info.
I have Thinkpad T420i.

Hibernation can be useful when you know that you are travelling and
won't use your laptop for certain number of hours. And when battery
runs out suspend will kill everything and shutdown.

[1] 
https://wiki.archlinux.org/index.php/Suspend_and_hibernate#About_swap_partition.2Ffile_size
[2] https://www.kernel.org/doc/Documentation/power/interface.txt
[3] 
https://wiki.archlinux.org/index.php/Suspend_and_hibernate#Hibernation_into_swap_file

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Re: Hibernate and lack of docs

2014-11-10 Thread Tim
On Tue, 2014-11-11 at 02:07 +0530, Sudhir Khanger wrote:
 I don't think swap size has to be bigger than size of RAM. Arch Linux
 has a good note on size of swap partition [1] which links to kernel
 documentation[2]. I used to make 4GB of swap partition on a system
 with 8GB of RAM on Arch Linux.

It does if you want to suspend/hibernate to the swap space.  Your RAM
has to dump its contents somewhere, and that's where it goes.


-- 
tim@localhost ~]$ uname -rsvp

Linux 3.16.7-200.fc20.i686 #1 SMP Thu Oct 30 18:40:30 UTC 2014 i686

All mail to my mailbox is automatically deleted, there is no point trying
to privately email me, I will only read messages posted to the public lists.

George Orwell's '1984' was supposed to be a warning against tyranny, not
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Hibernate and lack of docs

2014-11-09 Thread Martín Marqués
Hi all,

I was trying to get hibernation working on my F20 laptop with which I work.

Going through the process, which I thought would be more transparent
or that it would just be like hitting the hibernation and that's it, I
found great deficiencies in Fedora (maybe just from the kernel) and
especially in the docs (or the lack of documentation in this
particular issue):

1) I had trouble getting the system to hibernate. There wasn't
anything clear about the fact that you needed to have a swap bigger
than the amount of memory you have. Also, it doesn't work if you have
a file as swap (which was the easiest way to start testing)

2) You need (or at least with my laptop) to add the resume=swap FS,
this I did find information in the docs, but I'm a bit surprised that
Fedora doesn't give better information about all this during the
installation process.

3) When adding the resume= option to the kernel line in grub you can't
use UUID like FS. That is a bug IMHO.

Well that's as much as I remember now.

At least I now have hibernation working correctly on my laptop.

Regards,

-- 
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Re: Hibernate and lack of docs

2014-11-09 Thread Pete Travis

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

On 11/09/2014 03:38 PM, Martín Marqués wrote:
 Hi all,

 I was trying to get hibernation working on my F20 laptop with which I
work.

 Going through the process, which I thought would be more transparent
 or that it would just be like hitting the hibernation and that's it, I
 found great deficiencies in Fedora (maybe just from the kernel) and
 especially in the docs (or the lack of documentation in this
 particular issue):

 1) I had trouble getting the system to hibernate. There wasn't
 anything clear about the fact that you needed to have a swap bigger
 than the amount of memory you have. Also, it doesn't work if you have
 a file as swap (which was the easiest way to start testing)

 2) You need (or at least with my laptop) to add the resume=swap FS,
 this I did find information in the docs, but I'm a bit surprised that
 Fedora doesn't give better information about all this during the
 installation process.

 3) When adding the resume= option to the kernel line in grub you can't
 use UUID like FS. That is a bug IMHO.

 Well that's as much as I remember now.

 At least I now have hibernation working correctly on my laptop.

 Regards,


Please file a bug[1] against the documentation you're referencing,
probably the Power Management Guide?  That will help the guide
coordinator ensure that the issue is appropriately addressed. Point 1)
seems especially relevant, that much should be explicitly clear.

fwiw, it seems like hibernation is generally falling out of favor these
days.  I know not everyone has newer systems, but those that do have
machines that use shockingly little power on suspend, and cold boot
faster than a resume from hibernate could ever achieve.

On point 3, one would hope that resuming from hibernate didn't require
you to manually edit the grub configs every time :)  I'm not well versed
in the area, but it smells like at least one bug/deficiency  from here.


[1]
http://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/pr01s02.html

- -- 
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 - Fedora Docs Project Leader
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 - immanet...@fedoraproject.org
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Re: Hibernate and lack of docs

2014-11-09 Thread Ed Greshko
On 11/10/14 06:38, Martín Marqués wrote:
 Hi all,

 I was trying to get hibernation working on my F20 laptop with which I work.

I don't use hibernation myself but

 Going through the process, which I thought would be more transparent
 or that it would just be like hitting the hibernation and that's it, I
 found great deficiencies in Fedora (maybe just from the kernel) and
 especially in the docs (or the lack of documentation in this
 particular issue):

 1) I had trouble getting the system to hibernate. There wasn't
 anything clear about the fact that you needed to have a swap bigger
 than the amount of memory you have. Also, it doesn't work if you have
 a file as swap (which was the easiest way to start testing)

http://docs.fedoraproject.org/en-US/Fedora/18/html/Installation_Guide/s2-diskpartrecommend-x86.html

Yes, it is true that you may have to look at earlier release documentation as 
it may not be carried forward if the information hasn't changed.


 2) You need (or at least with my laptop) to add the resume=swap FS,
 this I did find information in the docs, but I'm a bit surprised that
 Fedora doesn't give better information about all this during the
 installation process.

 3) When adding the resume= option to the kernel line in grub you can't
 use UUID like FS. That is a bug IMHO.

Let us know the bugzilla # after you file it.

 Well that's as much as I remember now.

 At least I now have hibernation working correctly on my laptop.

When it comes to documentation deficiencies you're invited to help improve the 
documentation as this is community driven.

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Re: Hibernate and lack of docs

2014-11-09 Thread Ranjan Maitra
On Sun, 9 Nov 2014 16:31:07 -0700 Pete Travis li...@petetravis.com wrote:

 
 -BEGIN PGP SIGNED MESSAGE-
 Hash: SHA1
 
 On 11/09/2014 03:38 PM, Martín Marqués wrote:
  Hi all,
 
  I was trying to get hibernation working on my F20 laptop with which I
 work.
 
  Going through the process, which I thought would be more transparent
  or that it would just be like hitting the hibernation and that's it, I
  found great deficiencies in Fedora (maybe just from the kernel) and
  especially in the docs (or the lack of documentation in this
  particular issue):
 
  1) I had trouble getting the system to hibernate. There wasn't
  anything clear about the fact that you needed to have a swap bigger
  than the amount of memory you have. Also, it doesn't work if you have
  a file as swap (which was the easiest way to start testing)
 
  2) You need (or at least with my laptop) to add the resume=swap FS,
  this I did find information in the docs, but I'm a bit surprised that
  Fedora doesn't give better information about all this during the
  installation process.
 
  3) When adding the resume= option to the kernel line in grub you can't
  use UUID like FS. That is a bug IMHO.
 
  Well that's as much as I remember now.
 
  At least I now have hibernation working correctly on my laptop.
 
  Regards,
 
 
 Please file a bug[1] against the documentation you're referencing,
 probably the Power Management Guide?  That will help the guide
 coordinator ensure that the issue is appropriately addressed. Point 1)
 seems especially relevant, that much should be explicitly clear.
 
 fwiw, it seems like hibernation is generally falling out of favor these
 days.  I know not everyone has newer systems, but those that do have
 machines that use shockingly little power on suspend, and cold boot
 faster than a resume from hibernate could ever achieve.
 
 On point 3, one would hope that resuming from hibernate didn't require
 you to manually edit the grub configs every time :)  I'm not well versed
 in the area, but it smells like at least one bug/deficiency  from here.
 
 
 [1]
 http://docs.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/pr01s02.html
 

The following thread of December 2013 may be useful.

https://lists.fedoraproject.org/pipermail/users/2013-December/443871.html

I think it was a rank bad idea on the part of Fedora to blindly follow stupid 
Ubuntu and disable hibernation by default. As a result, it appears to me that 
this feature of the kernel is not being tested enough, as evidenced from my 
tribulations using a Dell Precision M3800. There is now no longer enough data 
on possible issues with this feature for developers to put fixes on. (Not 
everyone realizes that the feature can be turned on, and they give up on 
hibernation rather than try it and file bug reports). 

Hopefully, Fedora will consider bringing back this resume feature enabled by 
default in future releases.

Ranjan

 - -- 
 - -- Pete Travis
  - Fedora Docs Project Leader
  - 'randomuser' on freenode
  - immanet...@fedoraproject.org
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