Dual head xinerama gives weird issues

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http://www.linuxquestions.org – Hi everyone, I was tinkering with some old hardware I had lying around with a fresh install of Debian. The motherboard has an onboard ProSavage card, and I added a PCI Matrox VGA card (yes, I know, most of you will tell me to throw that junk away, but bear with me :-P ). Output of `lspci': Code: 00:09.0 VGA compatible controller: Matrox Graphics, Inc. MGA 1064SG [Mystique] (rev 03) 01:00.0 VGA compatible controller: S3 Inc. VT8375 [ProSavage8 KM266/KL266] So both cards are clearly recognized (no `dmesg' errors). I wanted to try if I could use both displays in Xinerama mode. The only av (HowTos)