Bug 31895

Thanks for the report. Can you clarify (to help describe the exact problem you found, the terminology is confusing) what is meant by:
- sleep
- hibernation
- suspend
- hybrid sleep [is there a hybrid hibernation?]

I see 'suspend & 'hibernate' in other desktops. Is this a Plasma specific issue? You say you have other desktops to play with.

CC: (none) => lewyssmith

Yes, things are called different by different applications etc... then add translations...  ;-)

sleep = suspend: save to RAM, which keeps powered but all else except keyboard shut off, power lamp blinking.

hibernation: save to swap, power off. At next boot after grub and eventual LUKS, it restores, then go to DM login.

hybrid: yes there is such selection in Plasma settings.
The idea is that it works like suspend, but also save to swap so if power gets cut / battery runs out, system gets restored like from hibernation. 


The specific issue with Plasma is that hybrid is selectable but broken.
(Should be renamed hybris instead :^)   ;-)  ) 

IIRC I last tested hybrid working OK with Xfce with one laptop (forgot which one... using mga8, should try on mga9 :)

So much sofware, and even more hardware in shop, soo little time to play...

Thanks.
* sleep|suspend is only effective while power is maintained, resuming from RAM on wake-up; most systems powered off, but not the box itself.
* hibernation (to swap) saves system to swap for restoration at next power on, then powers off - completely?
* hybrid is both, but not shutting down the box; and looks like it should resume from RAM if power has not been lost, from swap if it has [reboot implied].

> Power Management > Energy Saving > [X] Suspend session, Hybrid sleep,
> 1 minute, Apply 
> 3. Wait a minute... screen go black, it saves, powers off (i.e all fans stop),
> power lamp start blinking.
> 4. hit a key: power lamp continuous, fans on..... but screen remain black
Step 3 is ambiguous. If the power light blinks, surely the box is still powered. Would you expect it to resume from RAM on wake-up?

(In reply to Lewis Smith from comment #3)

> * hibernation (to swap) saves system to swap for restoration at next power
> on, then powers off - completely?

Basically. Modern desktop supplies as well as laptops have standby power to some parts of main board and ports so they can be wake up by hitting a key, or serial port or special network communication.

Not very different from suspend, with the difference that in suspend also RAM is powered (but probably at lower voltage) and the system know how to continue rather than boot.


> > 3. Wait a minute... screen go black, it saves, powers off (i.e all fans stop), power lamp start blinking.

> Step 3 is ambiguous. If the power light blinks, surely the box is still
> powered.

Only standby power is on, in suspend mode powering RAM and some I/O incl ports and keyboard.  In full shut down, including when hibernated, RAM is not powered, and power lamp is off (but 5V standby from power supply is still on and some main board have an onboard LED to show it) 

Desktop power supplies have a small 5V "standby" output always on, and a signal from mainboard to power supply enables the main power supply which deliver main 5V and other voltages.
Then power converters and switches main board an also act to divert power.
Even more complicated in laptops where there is battery management...

Once again, thank you Morgan for your elaborate explanations.
LxQt at least (& probably other desktops) offer just Suspend|Hibernate, so this looks like a Plasma special [too clever].

Assigning accordingly.

CC: lewyssmith => (none)
Assignee: bugsquad => kde

I now tested with xfce, same there, suspend and hibernation works, but if i at logout dialogue select hybrid and later wake it up it just start and screen remain black, and it is not reacting on sctl-alt-2xbackspace/del.

So it is not plasma. 

That probably implies kernel/driver


Side note:
Xfce offers hybrid as button but not by timeout, plasma vice versa.

Gnome only offers suspend, not hibernation. Strange. I am not used to Gnome so i may miss somewhere needing to be enabled.

Assignee: kde => kernel

Created attachment 13831 [details]
Xfce Platform - journalctl

The suspend sleep is around 7:3x in journal.  Might be helpful.

This AMD APU on a laptop.  Xfce desktop.

Hope it helps.
Brian

CC: (none) => brtians1

I did some attempts, core i7 intel skylake.

Clean cauldron installation with kernel 6.3.2-2.mga9 and latest mesa-23.1.0-2.mga9. resume partition big enough to contain the whole available ram plus a tiny swap space and with a few GB of margins.

1st attempt: hibernation from Plasma menu fails: it tries to hibernate, then after a few seconds it goes back to login screen like if you were awakening (keyboard, mouse, etc. were not touched).

2nd attempt: sleep from Plasma menu fails. same as hibernation, i.e. back to login screen after a few seconds.

3rd attempt: sleep now freezes. Mouse pointer on screen totally frozen, and had to force power down the machine manually.

4th attempt: sleep freezes. There is no mouse pointer, just black screen. Had to force power down the machine.

5th attempt: after reboot sleep/resume worked once, but "hibernation" is no longer available in the Plasma Power/Session menu (I haven't changed anything in the Plasma configuration, where is gone?).

6th attempt: installed kernel 5.15.110-2.mga8 (from mga8, it just requires extra lib64openssl1.1-1.1.1t-mga8 from mga8). sleep/resume worked. hibernation couldn't test because it's disappeared from Plasma Power/Session menus.

7th attempt: same other tests with kernel-6.1.27-2. sleep/resume worked. Hibernation couldn't test because item still missed from Plasma Power/Session menus.

CC: (none) => ghibomgx

Hibernation on linux seem to be known to be a mess

Too complicated for errata.

What we could do is point to a comprehensive help site or similar.
Any tip welcome.

For now, removing FOR_ERRATA9

Keywords: FOR_ERRATA9 => (none)

Some kind of status update on my systems:

Suspend:
Works on all my laptops.
On my P55 main board with nvidia GTX750, resume from suspend fail to make picture on my monitor unless i power cycle the monitor, when kernel desktop or server is used with nvidia driver. Workarounds 1) manually power cycle monitor after resume, 2) use linus kernel, 3) use nouveau (slow) or modesetting (decent).

Hibernate:
Latest kernels solves earlier fail of hibernation on Asus Aspire 7.
Also works on Dell Precision M6300
But kernel panics on Lenovo Thinkpad T510

May try hybrid after 6.6.x is released.