Public bug reported:
A friend of mine has a Asus M51SE laptop shipped with 4 GB of RAM. It has a
video card with 256 MB of video RAM (see the attached dmesg.log).
The problem is that the prefetchable 256 MB of video memory are not assigned
nowhere, even if the memory range [c0000000:cfffffff] for which the card is
configured is marked as free. Strangely, usplash works perfectly while X or
directfb application cannot even start.
After searching, I found that the PCI bridge (00:01.0) holding the video card
(01:00.0) was configured to use a prefetchable mmio window of [bdf00000,
ddefffff], which is clearly more than enough because the video card is the only
device behind this bridge. It looks like a BIOS bug.
So I wrote a patch to write the correct iomem window into the bridge's BARs
before resource allocation and it seems to work.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Asus M51SE's video card won't work with 4GB RAM (BIOS bug ?)
https://bugs.launchpad.net/bugs/316079
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