Created attachment 461610 [details] Screenshot showing the error messages Description of problem: The system becomes unresponsive a few seconds after boot. On the console I get messages as in the attached screenshot. The system still responds to ping, but e.g. logging in locally or via ssh is not possible anymore. I guess all disk access is stalled. The only workarounds I've found are 1) disable vt-d in bios 2) pass "intel_iommu=off" kernel paramenter But this way I can't use vt-d anymore which I plan to use. The problem also appears when installing Fedora, here the installer hangs with the same messages. The kernel I've tried this with is 2.6.35.6-48.fc14.x86_64 but the problem also appears with some 2.6.34 releases I compiled myself earlier. The machine is a HP DL320 G6 with one Xeon E5520. The chipset is from the Intel 5500 series. This combination should allow for vt-d. The BIOS is version W07 (10/16/2010) which is as of today the newest version posted on HP's website. How reproducible: 100% Steps to Reproduce: 1. boot with vt-d enabled 2. wait till login prompt appears 3. wait about 10 seconds 4. try to log in or some other action which requires disk access Actual results: no login possible, no response exept the DMAR error messages as in screenshot Expected results: login possible I have attached the screenshot, lspci and dmesg. The dmesg is from a boot with intel_iommu=off as due to the bug I can't save one when vt-d is enabled.
Created attachment 461612 [details] dmesg without vt-d
Created attachment 461613 [details] lspci -vvv -nn
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