On 25 Dec 2025 at 11:09, George N. White III wrote: From: "George N. White III" <[email protected]> Date sent: Thu, 25 Dec 2025 11:09:46 -0400 Subject: Re: Laptop hangs after screen lock - Dell Latitude 7650 - Fedora 42 To: Community support for Fedora users <[email protected]> Send reply to: Community support for Fedora users <[email protected]>
> > On Wed, Dec 24, 2025 at 11:56 AM ogio.spam <[email protected]> > wrote: > Il giorno mer, 24/12/2025 alle 13.58 +1030, Tim via users ha scritto: > On Tue, 2025-12-23 at 18:16 +0100, ogio.spam wrote: > If I disable the screen lock, or if I manually put the system to > sleep > or hibernation, everything seems to work fine. > > Is your screen lock using a screensaver or just blanking the screen? > Screensavers were often a cause of problems in the past. > > Hello Tim, > I don't use a screensaver. After locking the PC, it goes blanking the > screen in a few minutes. > > I'll try to configure to not blank the screen, in order to check if this is > the problem. > > > I've had problems recently with aLatitude 7480. The battery is weak and > the keyboardhas bad > keys, so it normally sits on a desk with an external monitor, mouse, and > keyboard. I sometimes > used etherwake to ssh in from another system, but that stopped working > in F43. > > I've tried: > % cat /etc/systemd/sleep.conf.d/nosuspend.conf > # see: man5 sleep.conf.d > # seems associated with rcu stalls > # Dec 05 15:30:22 kernel: Voluntary context switch within RCU read-side > critical section! > # Dec 05 15:30:22 kernel: WARNING: CPU: 1 PID: 2770 at > kernel/rcu/tree_plugin.h:332 rcu_note_context_switch+0x303/0x320 > # Dec 05 15:30:22 kernel: RIP: > 0010:rcu_note_context_switch+0x303/0x320 > # Dec 05 15:31:22 kernel: rcu: INFO: rcu_preempt detected stalls on > CPUs/tasks: > # Dec 05 15:31:22 kernel: rcu: Tasks blocked on level-0 rcu_node > (CPUs 0-3): P2770/32:b..l > # Dec 05 15:31:22 kernel: rcu: (detected by 2, t=60002 jiffies, > g=112541, q=2703 ncpus=4) > # > [Sleep] > AllowSuspend=no > AllowHibernation=no > AllowSuspendThenHibernate=no > AllowHybridSleep=no > > With each new kernel I enable this but continue to see rcu stalls. I can, > however, ssh in as it doesn't sleep. I've got a dell Lattituede 5580. Don't have the file you posted, but this is what is working for me. cat /etc/systemd/sleep.conf # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it under the # terms of the GNU Lesser General Public License as published by the Free # Software Foundation; either version 2.1 of the License, or (at your option) # any later version. # # Entries in this file show the compile time defaults. Local configuration # should be created by either modifying this file, or by creating "drop-ins" in # the sleep.conf.d/ subdirectory. The latter is generally recommended. # Defaults can be restored by simply deleting this file and all drop-ins. # # See systemd-sleep.conf(5) for details. [Sleep] AllowSuspend=no AllowHibernation=no AllowSuspendThenHibernate=no AllowHybridSleep=no #SuspendMode= #SuspendState=mem standby freeze #HibernateMode=platform shutdown #HibernateState=disk #HybridSleepMode=suspend platform shutdown #HybridSleepState=disk #HibernateDelaySec= #SuspendEstimationSec=60min I have a number of machines as well, all running TurboVNC and works fine to quickly connect to the machines. Some are 18 times zones ahead of where I am at moment, so having them go to sleep was a bad thing. Hope that helps. > > > > > -- > George N. White III > +------------------------------------------------------------+ Michael D. Setzer II - Computer Science Instructor (Retired) mailto:[email protected] mailto:[email protected] mailto:[email protected] Guam - Where America's Day Begins G4L Disk Imaging Project maintainer http://sourceforge.net/projects/g4l/ +------------------------------------------------------------+ -- _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
