The attached dmesg output from after
 - USB power loss (affecting mouse and USB stick while USB HD with its own 
power supply continues to work);
 - caps lock LED power loss;
 - no more working Ctrl-Alt-F1-F6 seems no different to me from one generated 
during a normal boot (attached previously), except for the 2 bottommost lines:

[  860.204089] usb 2-1: reset low speed USB device using uhci_hcd and address 3
[ 2574.652058] usb 2-1: reset low speed USB device using uhci_hcd and address 3
[ 2574.958078] usb 2-1: failed to restore interface 0 altsetting 0 (error=-71)
[ 2574.959979] usb 2-1: USB disconnect, address 3

** Attachment added: "dmesg.log"
   http://launchpadlibrarian.net/21171506/dmesg-noUSB.txt

** Summary changed:

- no more ctrl-alt-F1 + loss of USB power 3 minutes after hibernation
+ no more caps-lock LED, Ctrl-Alt-F1-F6 nor USB power some time after boot

** Description changed:

  Binary package hint: acpi-support
  
  At first, hibernation aka. suspend to disk seems to work fine, but there
  are a couple of weird issues not noticeable immediately that render it
  dysfunctional:
  
  #1 Keys Ctrl-Alt F1-F7 do not react at all anymore!
  
- #2 The Caps-Lock key works in X, but the keyboard light does on toggle.
+ #2 The Caps-Lock key works in X, but the keyboard light does not toggle.
  
  #3 Approximately three minutes after resume from disk (hibernation), my 
external USB mouse stops working. It appears that all USB ports do not supply 
power anymore. It worked seconds before. kern.log contains:
  Nov 18 09:54:51 laptop kernel: [15673.436160] ACPI: Waking up from system 
sleep state S4
  ...
  Nov 18 09:55:38 laptop kernel: [15723.472077] usb 2-1: reset low speed USB 
device using uhci_hcd and address 3
  Nov 18 09:55:54 laptop kernel: [15739.560087] usb 2-1: reset low speed USB 
device using uhci_hcd and address 3
  Nov 18 09:56:04 laptop kernel: [15749.648028] usb 2-1: reset low speed USB 
device using uhci_hcd and address 3
  Nov 18 09:56:47 laptop kernel: [15792.316059] usb 2-1: reset low speed USB 
device using uhci_hcd and address 3
  Nov 18 09:57:13 laptop kernel: [15817.984084] usb 2-1: reset low speed USB 
device using uhci_hcd and address 3
  Nov 18 09:57:13 laptop kernel: [15818.288133] usb 2-1: failed to restore 
interface 0 altsetting 0 (error=-71)
  Nov 18 09:57:13 laptop kernel: [15818.290642] usb 2-1: USB disconnect, 
address 3
  
  Unplugging/replugging doesn't help afterwards. USB seems dead.
  The laptop's two internal touchpad and button-amid-keyboard mice continue to 
work.
  
  Despite the above issues, X seems mostly functional (some apps may hang 
sooner or later). However, I could not create another session on vt8. 
Xorg.20.log says:
  Fatal server error:
  xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call
  
  Suspend to RAM is not affected.
  
  The machine is a HP Compaq nc6220 laptop, running Intrepid (updated from 
Hardy, updated from Gutsy, all release versions, no beta) with the latest 
updates at the time of writing.
  Hibernation worked good enough (not perfect, it has other quirks) in Hardy.
  
  uname -a: Linux laptop 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 
i686 GNU/Linux
  /proc/version_signature: Ubuntu 2.6.27-7.16-generic

-- 
no more caps-lock LED, Ctrl-Alt-F1-F6 nor USB power some time after boot
https://bugs.launchpad.net/bugs/299496
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