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 a Latitude 7480. The battery is weak and the keyboard has 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. -- George N. White III
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