>From https://bbs.archlinux.org/viewtopic.php?id=55086, below explains a
bit about the PAT thing:
Glad you got the problem fixed, that's what the forums are for.
big_smile
It looks like you probably updated your kernel and your laptop is not
liking the recent work done to implement PATs.
PAT (Page Attribute Table) is a feature found in x86 processors that
allows for setting the memory attribute at the page level granularity.
PAT is complementary to the MTRR settings which allows for setting of
memory types over physical address ranges. However, PAT is more flexible
than MTRR due to its capability to set attributes at page level and also
due to the fact that there are no hardware limitations on number of such
attribute settings allowed. It's not a very new feature: the Linux
support for this has been in the works for a long time: the current
patches are evolved from ones started in 2006, and there're traces of
preliminary patches in 2001. Probably because it's not a critical
feature and MTRRs did the job.
In other words the lag you are experiencing is actually a CPU caching
problem, the -nopat (early) kernel parameter says to ignore PAT and just
mtrr, which is why it fixes your problem.
Aside: I find it strange that you are having this problem, as it is
typically a 64bit problem...
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https://bugs.launchpad.net/bugs/1004546
Title:
Ubuntu fglrx cannot recognize video memory at boot, blank screen
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