Comment 11 for bug 370552

Note that this solution worked for a ThinkPad410 with Intel graphics (i915 driver), as follows:

Kevin Lake wrote on 2010-01-24:

Martin, on Ubuntu (Karmic) you should edit the file /etc/default/grub and add the options in the GRUB_CMDLINE_LINUX parameter, so that it reads:
GRUB_CMDLINE_LINUX="enable_mtrr_cleanup mtrr_spare_reg_nr=1"
then run

update-grub