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Old 04-13-2003, 05:52 PM   #1
lezek
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Unhappy framebuffer causes kernel panic after RAM upgrade


Mandrake 9.0 doesn't seem to be able to boot with framebuffer enabled since i doubled my RAM from 512MB to 1 GB, the kernel panics without displaying anything at all. With 512mb, or with framebuffer disabled all works fine.

Other hardware is Geforce 4 Ti4200, EPoX 8RDA+ mobo (nForce 2 chipset), Athlon XP 2000+ (not that CPU should affect anything).

Any ideas?
 
Old 04-13-2003, 05:55 PM   #2
Proud
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Tried Failsafe mode, or without FB?
Maybe it's naff RAM?
 
Old 04-13-2003, 06:16 PM   #3
lezek
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Like i said it works fine if i boot without FB. But I *like* FB and want it back if possible.

And yeah it is naff RAM, but it works fine if cooled properly and I've plenty of that .

Oh, I forgot to mention that my 1GB consists of two sticks of DDR333, and I'm taking advantage of the dual memory controllers of the nForce2 to squeeze a little bit more speed out. Previously, I had just the one 512MB stick of DDR333.

So to summarize the difference in my system before and after the problem occurred:

Before:
1 x 512MB DDR
Not using DualDDR

After
2 x 512MB DDR
Using DualDDR

If I take out the extra stick, then I can work as before. Of course, my system gets slower and I have less RAM. If I leave it in, I have to disable framebuffer.

I'm at a loss here, I don't really see what difference the amount of RAM or speed of access should make...
 
Old 04-13-2003, 07:04 PM   #4
finegan
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Assuming no ipzo-kazoo hardware... the only thing I can think is that maybe there's a kernel bug in fb that doinks up with the lowmem option to the kernel when it should be highmem. You haven't recompiled your kernel with high-memory support have you? (needed to take advantage of greater than 960Mb).

Or... Its something wonky with the board and its allocation for framebuffering, maybe. That's just a little weird.

Cheers,

Finegan
 
Old 04-13-2003, 07:30 PM   #5
lezek
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Hmm, well KDE's RAM information thingy tells me I have 904.42MB of physical memory, as opposed to 1024MB which is what I actually have, so I guess this suggests I don't have high-memory support. Is there any reason Mandrake would disable that by default (apart from them being idiots, which I was already well aware of)?
 
Old 04-13-2003, 07:32 PM   #6
Aussie
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Is your nvidia linux nforce driver up to date?
 
Old 04-13-2003, 07:32 PM   #7
Aussie
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woops :0
 
Old 04-13-2003, 07:34 PM   #8
finegan
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Nah, that's smart, running a BigMem enabled kernel when you don't have it slows down a lot of other processes, apparently running one of the, I can't remember the name... perversely big memory kernels on less than 1gb is really pokey. They niches go: 4mb-9??mb, then up to 4Gb, then another notch up to 64Gb, which is the most the kernel can currently handle, I think.

A recompile up to Bigmem is rather easy, hoepfully its something as simple as that which is the culprit.

Cheers,

Finegan
 
Old 04-13-2003, 07:50 PM   #9
lezek
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Angry

In that case GRR at kernel people for designing it that way. Actually, I can answer my own question regarding memory reported as 900 and something MB; I have the AGP aperture size set to 128MB which accounts for the difference.

I shall try a kernel recompile and see if that helps matters.
 
Old 04-14-2003, 04:23 PM   #10
lezek
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I tried a recompile of the kernel to no avail. Any more ideas before I risk a BIOS upgrade?
 
  


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