-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/6/2014 3:35 PM, Steve Langasek wrote: > As far back as the Maverick (i.e., 10.10) release notes[1], we > prominently documented the fact that the hibernate option was not > reliable: > > Hibernation may be unavailable with automatic partitioning. The > default partitioning recipe in the installer will in some cases > allocate a swap partition that is smaller than the physical memory > in the system. This will prevent the use of hibernation > (suspend-to-disk) because the system image will not fit in the swap > partition. If you intend to use hibernation with your system, you > should ensure that the swap partition's size is at least as large > as the system's physical RAM. (345126) > https://bugs.launchpad.net/ubuntu/+source/partman-auto/+bug/345126
Most of the time you don't actually need swap >= physical ram. If you only have 1 GB of ram in use at the time you try to hibernate, you only need 1 GB of swap, even if you have 4 GB of ram. If you install uswsusp, you might even need less as it compresses the pages as it writes them out. > - if a newer kernel package has been installed (which happens > frequently), resume from hibernation will fail. Now that's a good technical problem. Probably could be simply worked around by having the menu disable the hibernate option after a kernel upgrade. Of course, we do already put up the big red flag telling people they need to reboot, so that should be almost as good. > - if there is insufficient memory, hibernation will fail. I don't think that's anywhere near serious enough to disable it. As long as it doesn't fail by hanging, or failing to resume properly I don't see this as a problem. Probably would be nice to get a pop up telling you that you to free up some ram and try again though. > There was also the design issue: > > - the difference between suspend and hibernate is opaque to the > average user; the user should not have to guess between them. A lot of users understand and care about the difference. I would go so far as to say *most* of Ubuntu's users, which tend to be more savvy than the average Windows user, understands the difference. Even most Windows users understand the difference since they have been using both under Windows for years. The ignorant group should not run rough shod over the educated users. At best, this is a reason to hide the hibernate option behind either a modifier key, or a setting that is easily found, say in the power settings. > If you were to fix these bugs, I'm sure no one would be unhappy > with that. It doesn't sound like you're volunteering to fix them, > though, but instead insisting that some unspecified other should be > required to do the work to make this reliable. No, I'm saying that just because hibernate doesn't work with dm-crypt isn't a reason to disable it for everyone ( and not provide a simple way to turn it back on ). It would be nice to get hibernation over dm-crypt working, but I think it's also perfectly acceptable to simply document that it doesn't work over dm-crypt ( which most people don't use or know about ). > As far as I can see, what's needed here is for someone to do the > work to expose the option in the UI only when we can know that > hibernate will succeed. I think we should also still have design > team input regarding which of suspend and hibernate should be > exposed in the UI by default. That would be good sense if it failed catastrophically much of the time. As far as I can see, it is quite rare that it fails, and when it does, there's no harm done, so there's no reason to disable it. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSyyLjAAoJEI5FoCIzSKrw+pgH/AjWKq1ZvmXjSW3NhmQQgVoP UgswFGasDF4ZdIK5oVLLeBAbovIXMOOO40omhGOOeZw83AxkGVdikrcT2hdl0WOL gcxvgWiCUuSZtW9t/ieATME6RQxOdKyYyXX2JQGB3JCzItFYA+A4JuUylLoScMYM Jagv7A4wPE3faAWK2NIjVxk8JjTyUXcu3umoFIJnsPvGcXspoouoSync5CqPrJpA MvR1hkETfQy1CwNPeJJv9YQKewiRFvtCToHavkr6x2SthJm2Km2gSYmYldsGdd5y iV2txGmgG5OU0e5UqeotcS6kWxvLmUpJtBj/BqZFGU+xYUt3ahybDAmwu0FBkdE= =DcvB -----END PGP SIGNATURE----- -- technical-board mailing list technical-board@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/technical-board
