Hi, I installed Xen 4.0 on Dell Optplex 755(Intel Q35 chipset). The NIC passthrough succeeded. Next, I tried VGA passthrough of Intel IGD graphics. 00:02.0 VGA compatible controller: Intel Corporation 82Q35 Express Integrated Graphics Controller (rev 02) 00:02.1 Display controller: Intel Corporation 82Q35 Express Integrated Graphics Controller (rev 02) However, when gfx_passthru is enabed, the xm create command reports error. $ sudo xm create /etc/xen/xp.hvm Using config file "/etc/xen/xp.hvm". Error: (22, ''Invalid argument'') Any ideas? Domein-0 : Ubuntu 9.04(64-bit), 2.6.31.13 kernel Guest : Windows XP(32-bit) /boot/grub/menu.list: title Xen uuid a97f93fe-e4f9-4c4c-b287-5b2bac738165 kernel /boot/xen.gz iommu=1 dom0_mem=2048M module /boot/vmlinuz-2.6.31.13 root=UUID=a97f93fe-e4f9-4c4c-b287-5b2bac738165 ro nomodeset xen-pciback.hide=(00:02.0)(00:02.1) module /boot/initrd.img-2.6.31.13 /etc/xen/xp.hvm: gfx_passthru=1 pci=[ ''00:02.0'',''00:02.1'' ] Thanks, --- Toshimistu Tanaka t_tanaka@db3.so-net.ne.jp toshi3.cocolog-nifty.com/blog _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com lists.xensource.com/xen-users