After looked into Matrox support forum (actually this question should go to that forum perhaps, though I am not sure if I am on-topic by sending to this list) a Matrox support stuff said the user should use the driver they released if dual-head feature is needed. He/she was talking about G450 MMS ("You need to use the matrox beta driver to make an MMS card work."), but I got no way to tell if I have a MMS card, at leat this is not written on the card. Matrox didn't release a driver for Xorg 6.9.0, trying the driver for 6.8.2 (latest) gives a lot of Unresolved symbol error. There is an i810 onbard card but never activated in the BIOS so I guess that is not causing this problem. <div>2006/6/6, 陈士成 <<a href="mailto:c.shicheng@gmail.com">c.shicheng@gmail.com</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div>Hello. Using Xorg 6.9.0 on SuSE 10.1 I am not able to bring up the second screen of Matrox G450 dual-head card. The card sits on PCI:4:0:0. (Some other dual-head card, e.g. some dual-head Cirrus Logic card, shows up on two separate PCI busID). X run on the first screen okay. The second card, using almost same setting in xorg.conf Device section except "Screen 1", cannot start X server with this error message: # X -config xorg.conf.test_second_head .... (WW) MGA: No matching Device section for instance (BusID PCI:4:0:0) found (EE) Screen 0 deleted because of no matching config section. (EE) Device(s) detected, but none match those in the config file. The funny thing is, it's being said "Screen 0 deleted because of no matching config section.", However on the xorg.conf I prepared for testing the second head, there is no "Screen 0" line (only a line "Screen 1"). I attached both xorg.conf.test_second_head (the file I use to test the second head) and the Xorg log. Any hint? Thank you in advance! </div> </blockquote></div>