My system definitely has a problem with load (and not only with a
display/calculation of the load value that is wrong).

Every task I do on the system takes ages. For example, "apt-get upgrade"
for linux-* 3.2.0-24.38 took ~35 minutes. In general, disk access seems
to be very slow, and if there are multiple processes running (backup,
mlocate.updatedb, or other simple but disk IO bound tasks) the system
load is easily around 8-10.

Like Rafael, I am using an encrypted LVM setup. Maybe the calculation of
the load values is not related after all?

Here's my top (someone was asking for it, no?)

top - 09:17:33 up 14 days, 13:40,  1 user,  load average: 1.83, 1.93, 2.91
Tasks: 137 total,   1 running, 136 sleeping,   0 stopped,   0 zombie
Cpu(s):  1.8%us,  0.8%sy,  0.0%ni, 73.0%id, 24.3%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2050676k total,  1814212k used,   236464k free,   318688k buffers
Swap:  1998844k total,    23252k used,  1975592k free,  1102336k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
 6226 root      20   0 17328 1264  908 R    2  0.1   0:00.01 top
    1 root      20   0 24320 1516  680 S    0  0.1   0:01.86 init
    2 root      20   0     0    0    0 S    0  0.0   0:00.26 kthreadd
    3 root      20   0     0    0    0 S    0  0.0   5:37.66 ksoftirqd/0
    5 root      20   0     0    0    0 S    0  0.0   0:00.62 kworker/u:0
    6 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/0
    7 root      RT   0     0    0    0 S    0  0.0   0:04.43 watchdog/0
    8 root      RT   0     0    0    0 S    0  0.0   0:00.00 migration/1
   10 root      20   0     0    0    0 S    0  0.0   1:46.03 ksoftirqd/1
   12 root      RT   0     0    0    0 S    0  0.0   0:03.69 watchdog/1
   13 root       0 -20     0    0    0 S    0  0.0   0:00.00 cpuset
   14 root       0 -20     0    0    0 S    0  0.0   0:00.00 khelper
   15 root      20   0     0    0    0 S    0  0.0   0:00.02 kdevtmpfs
   16 root       0 -20     0    0    0 S    0  0.0   0:00.00 netns
   17 root      20   0     0    0    0 S    0  0.0   0:00.00 kworker/u:1
   18 root      20   0     0    0    0 S    0  0.0   0:04.53 sync_supers
   19 root      20   0     0    0    0 S    0  0.0   0:00.08 bdi-default
   20 root       0 -20     0    0    0 S    0  0.0   0:00.00 kintegrityd
   21 root       0 -20     0    0    0 S    0  0.0   0:00.00 kblockd
   22 root       0 -20     0    0    0 S    0  0.0   0:00.00 ata_sff
   23 root      20   0     0    0    0 S    0  0.0   0:00.00 khubd
   24 root       0 -20     0    0    0 S    0  0.0   0:00.00 md
   26 root      20   0     0    0    0 S    0  0.0   0:00.88 khungtaskd
   27 root      20   0     0    0    0 S    0  0.0   2:07.20 kswapd0
   28 root      25   5     0    0    0 S    0  0.0   0:00.00 ksmd
   29 root      39  19     0    0    0 S    0  0.0   0:00.00 khugepaged
   30 root      20   0     0    0    0 S    0  0.0   0:00.01 fsnotify_mark
   31 root      20   0     0    0    0 S    0  0.0   0:00.00 ecryptfs-kthrea
   32 root       0 -20     0    0    0 S    0  0.0   0:00.00 crypto
   40 root       0 -20     0    0    0 S    0  0.0   0:00.00 kthrotld
   41 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_0
   42 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_1
   63 root       0 -20     0    0    0 S    0  0.0   0:00.00 devfreq_wq
  181 root      20   0     0    0    0 S    0  0.0   0:00.00 scsi_eh_2
  191 root      20   0     0    0    0 S    0  0.0   2:28.76 scsi_eh_3

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https://bugs.launchpad.net/bugs/995284

Title:
  High idle load on 64bit Ubuntu 12.04 with 3.2.0-24-generic kernel

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