to, 2007-09-06 kello 02:34 +0300, Antti J. Huhtala kirjoitti:
Hi list,
I've just filed a bug in
https://bugzilla.redhat.com/show_bug.cgi?id=278721
to report about agpgart aperture check failure after two recent kernel updates in my AMD Athlon 64 3000+ desktop box with ASUS K8N MB, Nvidia nForce3 chipset and ATI Radeon 9200 PRO controller. The problem appears in trying to restart the computer (warm boot). Then the booting process freezes right after 'Booting the kernel.' appears on screen. It won't go on from that point.
To be able to use the box at all I must perform a cold boot, i.e. power the system completely off. A couple of seconds off is sufficient. When booted after power-off, four lines of agpgart messages including
"No usable aperture found." "Consider rebooting with iommu=memaper=2 to get a good aperture."
are printed but booting continues past the 'freeze point' and eventually ends up in usual Gnome login screen. From then on the box runs normally.
agpgart aperture check has worked in this box through all kernels since FC4 in June, 2005 until 2.6.22.4-65 update on 25th Aug. apgart version is still the same 1.02 which has worked just fine for at least several months.
A more detailed description can be read from bugzilla. If anyone on this list has similar experience and box components, please add your comments to the above bug. If someone knows a quick remedy, that's welcome, too.
Thank you!
Antti
Although nobody on the list has commented my original bug report, I consider it appropriate to announce also here that a solution was found for my AGP aperture detection problem and my consequent inability to warm-boot the computer since kernel 2.6.22.4-65.fc7.x86_84 update.
My desktop box (only) has 512 M of RAM. However, I have to put mem=510M in /etc/grub.conf kernel line to facilitate both computer restart (warm boot) and AGP aperture detection. The latter is important e.g. in using GoogleEarth and other graphics-intensive programs (i.e. for speed).
My uneducated guess is that if no upper RAM memory limit is given, a memory overflow will occur and newer kernels crash. I don't know why this didn't happen until kernel 2.6.22.4-65 update came about.
I still have one minor problem: if I cold boot my box, AGP aperture is not detected but a simple reboot rectifies that. I suspect this is a timing problem in cold boot process but it may be just my memory chips.
Antti