Hi i seem to have the same problem
I have a Acer 5520g. AMD Turion 64 x2 TL-56 with the nforce 610m chips set and a geforce 8400m. Almost the same computer as you.
I am trying to install ubuntu but without success. I have tried all the 7.10 editions and the 6.04 LTS editions with the same result. The live cds are working just fine but as soon as i install it on the hdd it stalls doing boot up.
just after boot i get the following error: PCI: Failed to allocate mem resource #6:20000@90000000 for 0000:02:00.0
Then the system keeps booting but freezes on the Ubuntu load screen.
I have tried to look around different forums for a solution but so far nothing has worked.
Have you solved your problem or does it look remotely like mine?
I need help, i will post my bug reports as soon as I have worked out how.
Here is a few links that seems related to this problem:
I hope someone out there has an idea on a workaround.