| Summary: | Add a feature in the Power KCM to setup/enable Hibernation | ||
|---|---|---|---|
| Product: | [Applications] systemsettings | Reporter: | Justin Zobel <justin.zobel> |
| Component: | kcm_powerdevil | Assignee: | Plasma Bugs List <plasma-bugs-null> |
| Status: | CONFIRMED --- | ||
| Severity: | wishlist | CC: | davide, kde, kdedev, natalie_clarius, nate, ngompa, nilskemail+kde |
| Priority: | NOR | ||
| Version First Reported In: | unspecified | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed/Implemented In: | ||
| Sentry Crash Report: | |||
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Description
Justin Zobel
2023-09-28 12:05:01 UTC
Let me go a step further here: we could just dynamically create a swap file whenever hibernation is enabled. On Btrfs, all that's required to do is the following: $ truncate -s 0 swapfile $ chattr +C swapfile $ fallocate -l 32G swapfile # set this to just slightly larger than how much RAM is on the system $ chmod 0600 swapfile $ mkswap swapfile $ swapon swapfile Ideally, this swap file exists in a Btrfs subvolume that has "chattr +C" set on it, because we can use that subvolume to create more swap files as needed for performance. But setting up a swap file is just half of the work, right? You still need to tell the kernel about it: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate#Hibernation Not sure if it works differently between different distributions also. So yes, sounds like something nice, but also non-trivial to implement. With some things like disk changes, you can update the kernel about it with certain commands. I wonder if you can do that with Hibernation as well. You can use "grubby" in Fedora to do that easily and persistently. $ grubby --update-kernel=ALL --args=”<new cmdline args>” Other distributions may either have a commandline tool or just rely on updating /etc/default/grub. Probably the correct way to deal with this is provide a hook that a distribution can fill in with a script/command/etc. to handle it. That's a good idea, it could be a file on the system or something added at compile time. The file if detected would then show the Hibernation settings in the KCM. The file would contain the commands necessary to enable and disable hibernation on that particular OS. In case it's helpful, we have an implementation of the swap setup and management dance in https://github.com/facebook/chef-cookbooks/tree/main/cookbooks/fb_swap . While this won't be directly usable for this purpose, the systemd logic in there can likely be cribbed, or at least used as inspiration. There's also a slightly scary implementation that has been proposed to KDE Linux: https://invent.kde.org/kde-linux/kde-linux/-/merge_requests/281 I don't think it's an appropriate solution, but it does outline the mechanical steps for this. Given that this has has some discussion of ways forward, marking confirmed |