[CentOS] Memory vs. Display Card
rkarhuse at gmail.com
Sun Mar 8 13:16:07 UTC 2009
On Sat, Mar 7, 2009 at 10:00 PM, Rick <ellis at spinics.net> wrote:
> Since memory has become quite cheap lately I decided to move from 2 GB
> to 6. When I installed the memory every thing was fine until I went to
> run level 5. At that point the screen turned to garbage and the system
> froze. Is there a way to fix this so I can use the memory I bought? Do
> I need a new display card?
> Current hardware:
> Intel D975XBX2 Motherboard
> VGA compatible controller: ATI Technologies Inc RV505 [Radeon X1550 64-bit]
First of all, lots and lots of data "missing" here .....
Secondly, I agree with other posters --> make sure that memtest86+ runs
successfully and finds all your memory. Let it run *at least* overnight before
accepting the new memory. [Note: Three explicit things that you need to
check and report the results of here -- if you'd like more help.]
Third, check your BIOS settings -- particularly w.r.t. VGA memory, memory-hole
re-mapping, etc. I'd do this before I'd run the memtests, btw. Does the BIOS
see the memory? Is the BIOS configured to map the VGA + PCI + ... (typically
up to 1 GB) memory to higher space? Is your MTTR set to Discrete or
Continuous? I'd run the Intel Linux Firmware BIOS test to see if the BIOS /
Memory are configured and compatible at this point.
Forth, what (precisely) CentOS kernel are you booting?? Does it support
greater than 4 GB of RAM?? Does it see all the memory -- both the 6 GB
of physical RAM plus the VGA + PCI re-mapped -- e.g., does it see almost
7 GB of memory?? How does the kernel see the memory (e.g., the MTTR
block -- which is one of the first things the system reports when it boots up)??
Fifth, after the GUI scrambles the screen, did you kill the session and/or
switch to an alternate Virtual Console and review both /var/log/messages
and X.org logfiles??
Once, you've got that, you might have a better idea of what's going on ...
(and maybe where your problem is ...)
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