При засыпании на жёсткий диск при помощи powersave -U, было обнаружено следующее:

[130850.064398] CPU0 attaching NULL sched-domain.
[130850.064433] CPU1 attaching NULL sched-domain.
[130850.071517] CPU0 attaching sched-domain:
[130850.071531]  domain 0: span 0-1 level CPU
[130850.071539]   groups: 0 1
[130850.071551] CPU1 attaching sched-domain:
[130850.071556]  domain 0: span 0-1 level CPU
[130850.071561]   groups: 1 0
[130850.373767] [drm] Num pipes: 1
[130851.045285] PM: Syncing filesystems ... done.
[130851.055749] Freezing user space processes ... (elapsed 0.00 seconds) done.
[130851.058116] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
[130851.058357] PM: Shrinking memory... done (62231 pages freed)
[130857.908461] PM: Freed 248924 kbytes in 6.85 seconds (36.33 MB/s)
[130857.908471] Suspending console(s) (use no_console_suspend to debug)
[130858.112049] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[130858.414128] ACPI handle has no context!
[130858.414267] ACPI handle has no context!
[130858.414287] sdhci-pci 0000:06:04.3: PCI INT A disabled
[130858.414298] ACPI handle has no context!
[130858.428122] ACPI handle has no context!
[130858.428132] sdhci-pci 0000:06:04.1: PCI INT A disabled
[130858.428142] ACPI handle has no context!
[130858.444132] ACPI handle has no context!
[130858.444143] r8169 0000:05:00.0: PME# enabled
[130858.444153] ACPI handle has no context!
[130858.463198] ath_pci 0000:02:00.0: PCI INT A disabled
[130858.476056] HDA Intel 0000:01:05.2: PCI INT B disabled
[130858.476091] ACPI handle has no context!
[130858.508058] HDA Intel 0000:00:14.2: PCI INT A disabled
[130858.524110] ehci_hcd 0000:00:13.5: PCI INT D disabled
[130858.524161] ohci_hcd 0000:00:13.4: PCI INT C disabled
[130858.524211] ohci_hcd 0000:00:13.3: PCI INT B disabled
[130858.524260] ohci_hcd 0000:00:13.2: PCI INT C disabled
[130858.524309] ohci_hcd 0000:00:13.1: PCI INT B disabled
[130858.524357] ohci_hcd 0000:00:13.0: PCI INT A disabled
[130858.588258] ahci 0000:00:12.0: PCI INT A disabled
[130858.588493] ACPI: Preparing to enter system sleep state S4
[130858.589525] Disabling non-boot CPUs ...
[130858.592144] CPU 1 is now offline
[130858.592152] SMP alternatives: switching to UP code
[130858.689084] CPU0 attaching NULL sched-domain.
[130858.689094] CPU1 attaching NULL sched-domain.
[130858.689193] CPU0 attaching NULL sched-domain.
[130858.689626] CPU1 is down
[130858.692035] PM: Creating hibernation image:
[130858.693160] PM: Need to copy 111988 pages
[130858.693160] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[130858.693160] Intel machine check architecture supported.
[130858.693160] Intel machine check reporting enabled on CPU#0.
[131140.697962] Enabling non-boot CPUs ...
[131140.698257] SMP alternatives: switching to SMP code
[131140.700024] BUG: soft lockup - CPU#0 stuck for 263s! [pm-hibernate:4611]
[131140.700027] Modules linked in: tun nls_utf8 nls_cp866 vfat fat nls_base radeon drm binfmt_misc kqemu powernow_k8 cpufreq_powersave cpufreq_conservative cpufreq_ondemand freq_table cpufreq_userspace k8temp hwmon af_packet dm_mod mmc_block uvcvideo v4l2_compat_ioctl32 videodev v4l1_compat joydev r8169 sdhci_pci sdhci mmc_core psmouse serio_raw ati_agp mii sg i2c_piix4 pcspkr ide_cd_mod i2c_core evdev agpgart cdrom ehci_hcd ohci_hcd usbcore wlan_scan_sta processor ath_rate_sample button video battery ath_pci rtc_cmos rtc_core rtc_lib wlan ath_hal(P) ac output snd_hda_intel snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd_hwdep snd soundcore ext3 jbd mbcache ata_generic pata_acpi pata_atiixp ahci libata dock sd_mod crc_t10dif scsi_mod ide_disk ide_generic atiixp ide_pci_generic ide_core
[131140.700085]
[131140.700089] Pid: 4611, comm: pm-hibernate Tainted: P          (2.6.27-std-def-alt17 #1)
[131140.700092] EIP: 0060:[<c02337b4>] EFLAGS: 00000297 CPU: 0
[131140.700101] EIP is at on_each_cpu+0x24/0x40
[131140.700103] EAX: 00000000 EBX: 00000000 ECX: 00000002 EDX: 011e2000
[131140.700106] ESI: 00000000 EDI: c0212b80 EBP: f0ac1d50 ESP: f0ac1d44
[131140.700108]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[131140.700111] CR0: 8005003b CR2: b74e3216 CR3: 3462b000 CR4: 000006d0
[131140.700113] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[131140.700116] DR6: ffff0ff0 DR7: 00000400
[131140.700119]  [<f8c45000>] ? char2uni+0x0/0x30 [nls_utf8]
[131140.700125]  [<f8c45000>] ? char2uni+0x0/0x30 [nls_utf8]
[131140.700129]  [<c0212b34>] flush_tlb_all+0x14/0x20
[131140.700134]  [<c029540d>] unmap_kernel_range+0xcd/0xe0
[131140.700139]  [<f8c45000>] ? char2uni+0x0/0x30 [nls_utf8]
[131140.700145]  [<c029547a>] remove_vm_area+0x5a/0x70
[131140.700149]  [<c0295505>] __vunmap+0x45/0xe0
[131140.700154]  [<c02955be>] vunmap+0x1e/0x30
[131140.700157]  [<c0469315>] text_poke+0x95/0x140
[131140.700162]  [<c0465e56>] ? io_schedule_timeout+0x56/0xb0
[131140.700167]  [<c0208e7d>] alternatives_smp_switch+0xdd/0x180
[131140.700172]  [<c046c9d0>] ? __start_notes+0x0/0x24
[131140.700176]  [<c0462e8a>] native_cpu_up+0x17a/0x763
[131140.700179]  [<c02f0a95>] ? sysfs_add_file_mode+0x55/0x90
[131140.700185]  [<c02f2a1a>] ? internal_create_group+0xca/0x170
[131140.700189]  [<c0463473>] ? do_fork_idle+0x0/0x1e
[131140.700193]  [<c0247949>] ? __raw_notifier_call_chain+0x19/0x20
[131140.700198]  [<c04648bd>] _cpu_up+0x6d/0x109
[131140.700202]  [<c0458f11>] enable_nonboot_cpus+0x71/0xa0
[131140.700205]  [<c0258e07>] hibernation_snapshot+0x127/0x1f0
[131140.700209]  [<c0258fa4>] hibernate+0xd4/0x180
[131140.700212]  [<c0257a50>] ? state_store+0x0/0xc0
[131140.700217]  [<c0257af3>] state_store+0xa3/0xc0
[131140.700220]  [<c0257a50>] ? state_store+0x0/0xc0
[131140.700224]  [<c0330a24>] kobj_attr_store+0x24/0x30
[131140.700228]  [<c02f05d2>] sysfs_write_file+0x92/0xf0
[131140.700232]  [<c02a662c>] vfs_write+0x9c/0x170
[131140.700236]  [<c02f0540>] ? sysfs_write_file+0x0/0xf0
[131140.700240]  [<c02a67bd>] sys_write+0x3d/0x70
[131140.700243]  [<c0203e92>] syscall_call+0x7/0xb
[131140.700247]  =======================

При этом, проснулся и всё, вроде, работает.

Пакеты:
kernel-headers-alsa-1.0.17-alt1
kernel-modules-v4l-std-def-2.6.27-alt17
kernel-modules-kqemu-std-def-1.4.0-alt0.1.pre1.132635.17
kernel-headers-std-def-2.6.27-alt17
kernel-image-std-def-2.6.27-alt17
kernel-headers-modules-std-def-2.6.27-alt17
kernel-modules-svgalib_helper-std-def-1.9.25-alt5.132635.17
kernel-modules-drm-std-def-2.6.27-alt17
kernel-modules-madwifi-ar5007-std-def-0.9.4-alt1.132635.17
kernel-modules-alsa-std-def-2.6.27-alt17
pm-utils-1.2.4-alt1
libpowersave-0.15.20-alt3
kpowersave-0.7.3-alt2
powersave-0.15.20-alt3
powertop-1.10-alt1
powernowd-1.00-alt1