I am also experiencing this problem.

Description:
i) Fresh install of Kubuntu last night (AMD 64, experienced severe problems 
with i686).
ii) System was working fine until I left the laptop (Acer Aspire 7520) 
unatended for a while and the screen was powered down (probably also the hard 
drive, etc.) Afterwards:

iii) Audio module failed (HDA NVidia (ALC268 Analog)).
iv) Konsole froze.
v) NumLock key is not working.
vi) Unable to open a console with Ctrl-Alt-Fn.
vii) Unable to open new Konsole instance.

Hardware description:
Acer Aspire 7520-5947.
CPU: AMD Athlon 64 x2 TK-57 Dual-Core.
GPU: NVidia GeForce 7000M
Audio: HDA NVidia (ALC268 Analog.
Mem: Originally 2 GB ram, upgraded to 4 GB.
HDD: Originally 1x250 GB, added a 500 GB HDD.

Sorry I can not provide more detailed hardware info, I am experiencing
some keyboard problems! :-)

I am attaching /var/log/messages. This log file constitutes the entire
log since Kubuntu was installed (again last night).

This problem is Kubuntu specific. Until last night this laptop was
working with Fedora 12 without these problems (in case you are
wondering, I switched back to Kubuntu because I could not get my printer
or scanner to work with Fedora, so now I can choose between being able
to type but not print, or print but not type!)

I will now try the module blacklist workaround mentioned above and will
later post a new /var/log/messages.

I love Kubuntu but its quality has dropped severely in the last few
versions.

I hope this helps.

Cheers.

** Attachment added: "Experiencing the same problem."
   http://launchpadlibrarian.net/39463589/messages

-- 
Konsole LAG/Freezes when Typing - Kubuntu Karmic
https://bugs.launchpad.net/bugs/443318
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