to, 2008-04-03 kello 07:34 -0700, Sean Bruno kirjoitti: > On Thu, 2008-04-03 at 12:38 +0300, Antti J. Huhtala wrote: > > ke, 2008-04-02 kello 21:00 -0700, Sean Bruno kirjoitti: > > > I seem to remember this error message a long time ago on my dual > > > opteron, but then it went away. Now it has reappeared with the latest > > > kernel update: > > > > > > Checking aperture... > > > CPU 0: aperture @ c000000 size 32 MB > > > Aperture too small (32 MB) > > > No AGP bridge found > > > Your BIOS doesn't leave a aperture memory hole > > > Please enable the IOMMU option in the BIOS setup > > > This costs you 64 MB of RAM > > > Mapping aperture over 65536 KB of RAM @ c000000 > > > Memory: 6129976k/7340032k available (2491k kernel code, 161028k > > > reserved, 1390k data, 332k init) > > > SLUB: Genslabs=12, HWalign=64, Order=0-1, MinObjects=4, CPUs=4, Nodes=2 > > > Calibrating delay using timer specific routine.. 4021.83 BogoMIPS > > > (lpj=2010919) > > > > > > > > > lspci output --> http://consultcsg.com/lspci.out > > > full dmesg output --> http://consultcsg.com/dmesg.out > > > > > A similar problem has been bothering my box since last August, see > > > > https://bugzilla.redhat.com/show_bug.cgi?id=278721 > > > > However, when the box is rebooted (warm boot) the problem disappears and > > the 128 M reserved for AGP aperture in BIOS is found and used. The > > problem is there only if and when the box is cold-booted. > > My box has an ATI Radeon 9200 PRO VGA compatible controller with nvidia > > chipset. The motherboard (Asus K8N) BIOS has no IOMMU option. > > > > HTH, Antti > > > > > > > > > > In my scenario I didn't cold boot, it was just a kernel update and then > a reboot. > All right, then it's not quite the same problem. Also, in my case when I cold-boot, _no_ AGP aperture is found. Only when I reboot the 128 MB of memory reserved in BIOS for accelerated graphics is found. On the other hand, in the dmesg exerpt above it is said: "CPU 0: aperture @ c000000 size 32 MB" and "Aperture too small (32 MB)" This seems to indicate that 32 MB *is* reserved for AGP aperture in your motherboard BIOS. Have you tried changing that to 64 MB or 128 MB? > Also, I don't even have an AGP slot. So that confuses me even more. When you say "slot", are you referring to a connector reserved for a graphics card in the motherboard? According to eg. http://www.hardwarezone.com/articles/view.php?cid=25&id=1661 there *is* an expansion slot called "PCI Express graphics x16 slot". "AGP aperture" is not a hardware connector but a portion of RAM reserved for accelerated graphics. You can change the amount of RAM reserved in a BIOS setting. In K8N BIOS setup this is done in "Advanced->Chipset->Aperture Size". > The Asus K8N-DL is a PCI-E Graphics Motherboard. > Sean > Good luck! Antti
