I'm running the amd64 arch, so that kernel won't work here. I can boot with "noapictimer", and also with "nohz=off highres=off apci=debug debug". I'm attaching the dmesg from the latter boot options. (highres=off did not work by itself, not did nohz=off ) Here are the contents of some other files I've heard discussed in these threads (during the same boot as the dmesg, sorry I couldn't wait to capture these files on a CPU stuck boot): displague@split:~$ cat /sys/devices/system/clocksource/clocksource0/* hpet acpi_pm jiffies tsc hpet displague@split:~$ cat /proc/timer_list Timer List Version: v0.3 HRTIMER_MAX_CLOCK_BASES: 2 now at 474426458770 nsecs cpu: 0 clock 0: .index: 0 .resolution: 4000250 nsecs .get_time: ktime_get_real .offset: 0 nsecs active timers: clock 1: .index: 1 .resolution: 4000250 nsecs .get_time: ktime_get .offset: 0 nsecs active timers: #0: , hrtimer_wakeup, S:01, futex_wait, firefox/6746 # expires at 474458683930 nsecs [in 32225160 nsecs] #1: , it_real_fn, S:01, do_setitimer, syslogd/4925 # expires at 487622761050 nsecs [in 13196302280 nsecs] #2: , hrtimer_wakeup, S:01, futex_wait, firefox/6883 # expires at 518020472610 nsecs [in 43594013840 nsecs] #3: , hrtimer_wakeup, S:01, do_nanosleep, atd/5528 # expires at 3653344476130 nsecs [in 3178918017360 nsecs] .expires_next : 9223372036854775807 nsecs .hres_active : 0 .nr_events : 0 .nohz_mode : 0 .idle_tick : 0 nsecs .tick_stopped : 0 .idle_jiffies : 0 .idle_calls : 0 .idle_sleeps : 0 .idle_entrytime : 474421270370 nsecs .idle_waketime : 0 nsecs .idle_exittime : 0 nsecs .idle_sleeptime : 437221753573 nsecs .last_jiffies : 0 .next_jiffies : 0 .idle_expires : 0 nsecs jiffies: 4295010841 cpu: 1 clock 0: .index: 0 .resolution: 4000250 nsecs .get_time: ktime_get_real .offset: 0 nsecs active timers: clock 1: .index: 1 .resolution: 4000250 nsecs .get_time: ktime_get .offset: 0 nsecs active timers: #0: , hrtimer_wakeup, S:01, futex_wait, gvfsd-trash/6912 # expires at 474692183810 nsecs [in 265725040 nsecs] #1: , hrtimer_wakeup, S:01, futex_wait, firefox/6874 # expires at 492439331930 nsecs [in 18012873160 nsecs] #2: , hrtimer_wakeup, S:01, do_nanosleep, cron/5558 # expires at 519830787730 nsecs [in 45404328960 nsecs] .expires_next : 9223372036854775807 nsecs .hres_active : 0 .nr_events : 0 .nohz_mode : 0 .idle_tick : 0 nsecs .tick_stopped : 0 .idle_jiffies : 0 .idle_calls : 0 .idle_sleeps : 0 .idle_entrytime : 474426547050 nsecs .idle_waketime : 0 nsecs .idle_exittime : 0 nsecs .idle_sleeptime : 395247480831 nsecs .last_jiffies : 0 .next_jiffies : 0 .idle_expires : 0 nsecs jiffies: 4295010841 Tick Device: mode: 0 Clock Event Device: hpet max_delta_ns: 85899346200 min_delta_ns: 1920 mult: 107374182 shift: 32 mode: 2 next_event: 0 nsecs set_next_event: hpet_legacy_next_event set_mode: hpet_legacy_set_mode event_handler: tick_handle_periodic_broadcast tick_broadcast_mask: 00000003 tick_broadcast_oneshot_mask: 00000000 Tick Device: mode: 0 Clock Event Device: lapic max_delta_ns: 668034314 min_delta_ns: 1194 mult: 53932548 shift: 32 mode: 1 next_event: 0 nsecs set_next_event: lapic_next_event set_mode: lapic_timer_setup event_handler: tick_handle_periodic Tick Device: mode: 0 Clock Event Device: lapic max_delta_ns: 668034314 min_delta_ns: 1194 mult: 53932548 shift: 32 mode: 1 next_event: 0 nsecs set_next_event: lapic_next_event set_mode: lapic_timer_setup event_handler: tick_handle_periodic