Ubuntu
hibernate package

CPU error when resuming from hibernation

Asked by towheedm

After much searching and testing to get suspend-to-RAM and suspend-to-disk working on my machine, I have reached the point where I need to ask for some help.

I can now suspend-to-RAM successfully without any problems (as far as I can tell). I suspend-to-RAM, restart and everything is where it was before the STR. My USB devices, network, CPU's are all functioning normally after a resume from STR.

When I issue the command to hibernate, the image is saved to swap and the machine powers off successfully. Up to this point everything is as expected. After resuming, the image is restored but then I get this error: CPU1 not responding. However, the boot process continues and I get back to my session exactly where I hibernated. Again, my USB devices, network are all functioning normally. However, as would be expected from the error message, I'm only running on one CPU now. CPU0 is online, but CPU1 is offline. Trying to online CPU1 manually with:

echo 1 > /sys/devices/system/cpu/cpu1/online

generates a bash write error.

Any help in resolving this would be greatly appreciated.

I'm running Maverick on a Dell Dimension 8300 with P4 2.8GHz and 1GB RAM with an nVidia FX5200 video card using the proprietary drivers.

This is my cpu info from /proc/cpuinfo:

processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping : 9
cpu MHz : 2792.845
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr
bogomips : 5585.69
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 32 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.80GHz
stepping : 9
cpu MHz : 2792.845
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr
bogomips : 5586.45
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 32 bits virtual
power management:

Loaded modules from lsmod:
Module Size Used by
nls_utf8 1069 1
isofs 30022 1
binfmt_misc 6599 1
microcode 9653 0
snd_intel8x0 25664 2
snd_ac97_codec 99227 1 snd_intel8x0
ac97_bus 1014 1 snd_ac97_codec
nvidia 7088912 34
snd_usb_audio 86480 1
snd_pcm 71475 3 snd_intel8x0,snd_ac97_codec,snd_usb_audio
snd_hwdep 5040 1 snd_usb_audio
snd_usbmidi_lib 17413 1 snd_usb_audio
snd_seq_midi 4588 0
snd_rawmidi 17783 2 snd_usbmidi_lib,snd_seq_midi
snd_seq_midi_event 6047 1 snd_seq_midi
ppdev 5556 0
snd_seq 47174 2 snd_seq_midi,snd_seq_midi_event
snd_timer 19067 2 snd_pcm,snd_seq
dcdbas 5402 0
snd_seq_device 5744 3 snd_seq_midi,snd_rawmidi,snd_seq
gspca_ov519 35781 0
parport_pc 26058 1
gspca_main 23644 1 gspca_ov519
psmouse 59033 0
snd 49038 16 snd_intel8x0,snd_ac97_codec,snd_usb_audio,snd_pcm,snd_hwdep,snd_usbmidi_lib,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
videodev 43098 1 gspca_main
agpgart 32011 1 nvidia
serio_raw 4022 0
v4l1_compat 13359 1 videodev
joydev 8767 0
i82875p_edac 3358 0
soundcore 880 1 snd
snd_page_alloc 7120 2 snd_intel8x0,snd_pcm
shpchp 29886 0
edac_core 38630 3 i82875p_edac
lp 7342 0
parport 31492 3 ppdev,parport_pc,lp
raid10 22394 0
raid456 53514 0
async_raid6_recov 4883 1 raid456
async_pq 3038 2 raid456,async_raid6_recov
hid_logitech 8971 0
ff_memless 4393 1 hid_logitech
usbhid 36882 1 hid_logitech
hid 67742 2 hid_logitech,usbhid
raid6_pq 80029 2 async_raid6_recov,async_pq
async_xor 2298 3 raid456,async_raid6_recov,async_pq
xor 15136 1 async_xor
async_memcpy 1045 2 raid456,async_raid6_recov
async_tx 2135 5 raid456,async_raid6_recov,async_pq,async_xor,async_memcpy
raid1 20969 0
raid0 8547 4
multipath 5955 0
linear 3822 0
e100 30356 0
mii 4425 1 e100

This is from the kernel logs relating to the hibernation process:

Jul 14 21:04:46 GA1A4CH kernel: [ 3093.555947] PM: Marking nosave pages: 0000000000002000 - 0000000000010000
Jul 14 21:04:46 GA1A4CH kernel: [ 3093.555954] PM: Marking nosave pages: 00000000000a0000 - 0000000000100000
Jul 14 21:04:46 GA1A4CH kernel: [ 3093.555964] PM: Basic memory bitmaps created
Jul 14 21:05:38 GA1A4CH kernel: [ 3093.555968] PM: Syncing filesystems ... done.
Jul 14 21:05:39 GA1A4CH kernel: [ 3093.659711] Freezing user space processes ... (elapsed 0.01 seconds) done.
Jul 14 21:05:39 GA1A4CH kernel: [ 3093.676573] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
Jul 14 21:05:39 GA1A4CH kernel: [ 3093.692077] PM: Preallocating image memory... done (allocated 130269 pages)
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.210929] PM: Allocated 521076 kbytes in 0.51 seconds (1021.71 MB/s)
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.210933] Suspending console(s) (use no_console_suspend to debug)
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.211570] sd 3:0:0:0: [sdc] Synchronizing SCSI cache
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.211760] sd 2:0:0:0: [sdb] Synchronizing SCSI cache
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.212023] sd 0:0:0:0: [sda] Synchronizing SCSI cache
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.212921] parport_pc 00:07: disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213466] serial 00:06: disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213550] e100 0000:02:08.0: PCI INT A disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213559] e100 0000:02:08.0: PME# enabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213627] pci 0000:00:1e.0: wake-up capability enabled by ACPI
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213645] ACPI handle has no context!
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.213981] Intel ICH 0000:00:1f.5: PCI INT B disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.214280] ata_piix 0000:00:1f.2: PCI INT A disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.214447] ata_piix 0000:00:1f.1: PCI INT A disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.290378] PM: freeze of devices complete after 79.107 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.290779] PM: late freeze of devices complete after 0.395 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.290884] ACPI: Preparing to enter system sleep state S4
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.291061] PM: Saving platform NVS memory
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.291376] Disabling non-boot CPUs ...
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.291568] Broke affinity for irq 18
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.291577] Broke affinity for irq 19
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.292678] CPU 1 is now offline
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.292682] SMP alternatives: switching to UP code
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.301965] PM: Creating hibernation image:
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] PM: Need to copy 128186 pages
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] PM: Normal pages needed: 112533 + 1024, available pages: 114659
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] PM: Restoring platform NVS memory
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] microcode: CPU0 updated to revision 0x2e, date = 2004-08-11
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] Enabling non-boot CPUs ...
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.304005] SMP alternatives: switching to SMP code
Jul 14 21:05:39 GA1A4CH kernel: [ 3094.311697] Booting Node 0 Processor 1 APIC 0x1
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.322900] CPU1: Not responding.
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.323203] Error taking CPU1 up: -5
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.323226] ACPI: Waking up from system sleep state S4
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329580] ata_piix 0000:00:1f.1: restoring config space at offset 0x1 (was 0x2880003, writing 0x2880007)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329610] ata_piix 0000:00:1f.2: restoring config space at offset 0x1 (was 0x2a00001, writing 0x2a00005)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329669] Intel ICH 0000:00:1f.5: restoring config space at offset 0x1 (was 0x2900007, writing 0x2900003)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329694] nvidia 0000:01:00.0: restoring config space at offset 0xc (was 0xfea00000, writing 0x0)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329709] nvidia 0000:01:00.0: restoring config space at offset 0x3 (was 0x4000, writing 0xf800)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329717] nvidia 0000:01:00.0: restoring config space at offset 0x1 (was 0x2b00003, writing 0x2b00007)
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.329874] PM: early restore of devices complete after 0.610 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.407981] uhci_hcd 0000:00:1d.0: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408006] usb usb2: root hub lost power or was reset
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408123] uhci_hcd 0000:00:1d.1: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408154] usb usb3: root hub lost power or was reset
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408171] uhci_hcd 0000:00:1d.2: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408201] usb usb4: root hub lost power or was reset
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408220] uhci_hcd 0000:00:1d.3: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408249] usb usb5: root hub lost power or was reset
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408268] ehci_hcd 0000:00:1d.7: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.408301] usb usb1: root hub lost power or was reset
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.412190] ehci_hcd 0000:00:1d.7: cache line size of 64 is not supported
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.412208] pci 0000:00:1e.0: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.415441] serial 00:06: activated
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420026] ata_piix 0000:00:1f.1: PCI INT A -> GSI 18 (level, low) -> IRQ 18
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420033] ata_piix 0000:00:1f.1: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420271] ata_piix 0000:00:1f.2: PCI INT A -> GSI 18 (level, low) -> IRQ 18
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420277] ata_piix 0000:00:1f.2: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420428] Intel ICH 0000:00:1f.5: PCI INT B -> GSI 17 (level, low) -> IRQ 17
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.420435] Intel ICH 0000:00:1f.5: setting latency timer to 64
Jul 14 21:05:39 GA1A4CH kernel: [ 3099.462117] parport_pc 00:07: activated
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.366678] pci 0000:00:1e.0: wake-up capability disabled by ACPI
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.366687] e100 0000:02:08.0: PME# disabled
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.366693] PM: restore of drv:e100 dev:0000:02:08.0 complete after 905.511 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.366760] sd 0:0:0:0: [sda] Starting disk
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.479109] PM: restore of drv:nvidia dev:0000:01:00.0 complete after 1058.617 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.479136] sd 2:0:0:0: [sdb] Starting disk
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.479232] sd 3:0:0:0: [sdc] Starting disk
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.492690] ata4.00: configured for UDMA/133
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.492795] ata3.00: configured for UDMA/133
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.493670] ata1.00: configured for UDMA/100
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.516203] ata2.00: configured for UDMA/33
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.517340] PM: restore of drv:sd dev:0:0:0:0 complete after 150.576 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.517352] PM: restore of drv:scsi_device dev:0:0:0:0 complete after 150.540 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.532220] ata2.01: configured for UDMA/33
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.596032] PM: restore of drv:usb dev:usb4 complete after 229.403 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.596054] PM: restore of drv:usb dev:usb5 complete after 229.349 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.596065] PM: restore of drv:hub dev:4-0:1.0 complete after 229.407 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.596073] PM: restore of drv:hub dev:5-0:1.0 complete after 229.337 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.684020] PM: restore of drv:usb dev:usb2 complete after 1183.938 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.684035] PM: restore of drv:usb dev:usb3 complete after 1183.899 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.684047] PM: restore of drv:hub dev:2-0:1.0 complete after 1183.936 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.684059] PM: restore of drv:hub dev:3-0:1.0 complete after 1183.896 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.704019] PM: restore of drv:usb dev:usb1 complete after 1241.674 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.704031] PM: restore of drv:hub dev:1-0:1.0 complete after 1203.974 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.704070] PM: restore of drv: dev:ep_81 complete after 1241.783 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.816021] usb 2-1: reset full speed USB device using uhci_hcd and address 2
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989013] ov519 2-1:1.0: no reset_resume for driver ov519?
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989018] snd-usb-audio 2-1:1.1: no reset_resume for driver snd-usb-audio?
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989022] snd-usb-audio 2-1:1.2: no reset_resume for driver snd-usb-audio?
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989035] gspca: video0 disconnect
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989281] gspca: video0 released
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989491] PM: restore of drv:usb dev:2-1 complete after 510.189 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989517] PM: restore of drv:usb dev:2-1:1.0 complete after 510.191 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989527] PM: restore of drv:usb dev:2-1:1.1 complete after 510.177 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989535] PM: restore of drv:usb dev:2-1:1.2 complete after 510.160 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3100.989544] PM: restore of drv: dev:ep_81 complete after 284.928 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.216021] usb 3-1: reset low speed USB device using uhci_hcd and address 2
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.529961] PM: restore of drv:usb dev:3-1 complete after 1050.559 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.529976] PM: restore of drv:usbhid dev:3-1:1.0 complete after 1050.551 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.529986] PM: restore of drv:usbhid dev:3-1:1.1 complete after 1050.537 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.529995] PM: restore of drv: dev:ep_81 complete after 540.427 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.530066] PM: restore of devices complete after 2122.505 msecs
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.530129] gspca: probing 054c:0155
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.716933] ov519: I2C synced in 0 attempt(s)
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.716937] ov519: starting OV7xx0 configuration
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.728932] ov519: Sensor is an OV7648
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.745030] input: ov519 as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/input/input5
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.745191] gspca: video0 created
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.745210] gspca: probing 054c:0155
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.749957] 2:2:1: endpoint lacks sample rate attribute bit, cannot set.
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.754855] PM: Image restored successfully.
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.754859] Restarting tasks ... done.
Jul 14 21:05:39 GA1A4CH kernel: [ 3101.776048] PM: Basic memory bitmaps freed

Thanks.

Question information

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Ubuntu hibernate Edit question
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Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

If you run:

sudo -i
echo 1 > /sys/devices/system/cpu/cpu1/online
exit

Does it write ok?

Revision history for this message
towheedm (towheedm) said : 		#2

If course the only way to write to /sys is with root privileges. So yes, I did run it as root initially.

Revision history for this message
towheedm (towheedm) said : 		#3

No one knows why this is happening?

Well, I've tried with the 2.6.39.3 latest stable kernel from kernel.org with the same results. Seems I should post a bug report to the linux-pm mailing list.

Could someone guide me through the proper way of doing this?

Revision history for this message
Eliah Kagan (degeneracypressure) said : 		#4

You can read some recent linux-pm posts at https://lists.linux-foundation.org/pipermail/linux-pm/2011-July/thread.html to get a sense of how discussion goes on the list and how you may want to phrase your posts there. However, if you can reproduce this on a mainline kernel (a kernel built from source at http://kernel.org and not from Ubuntu or any other distribution's packages), you should probably report it at https://bugzilla.kernel.org.

Whether or not you can reproduce it in a mainline kernel (and whether or not you try), you can report this bug against linux in Ubuntu; please read https://help.ubuntu.com/community/ReportingBugs carefully first, search to see if it has already been reported, and if not then initiate the process of reporting it by running "ubuntu-bug linux". After reporting a bug in Ubuntu, you can link it to this question using the "Link existing bug" link near the top of this question page (however, your bug report should be complete and self contained, and it should not be necessary for developers to refer to this question in order to fully understand and appreciate your bug report).

Revision history for this message
towheedm (towheedm) said : 		#5

Thanks for the advice. The maintainers list from the mainline kernel recommended that hibernate problems be reported to the linux-pm lists. That's why I ask about this list. I have read some faqs about poting to both this list and on bugzilla and they all seem so strict about postings and formatting, I just did not want to anger anyone by making some stupid mistakes.

I'll look through the pipermail linkk you provided and also post a bug report to Ubuntu since it also happens with 2.6.35-28-generic. I've also built the 3.0 rc kernel and will try with this to if it stills happens.

Again, thanks for the advice.

towheedm

Revision history for this message
Eliah Kagan (degeneracypressure) said : 		#6

"The maintainers list from the mainline kernel recommended that hibernate problems be reported to the linux-pm lists."

Then I recommend you do that (as well as file a bug against linux in Ubuntu here on Launchpad). When posting you should make clear (unless it is manifestly clear from context) that you are using Ubuntu's kernel build, and not a mainline kernel.

Can you help with this problem?

Provide an answer of your own, or ask towheedm for more information if necessary.

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