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      1 WARNING:
      2 On exit XFree86 restores the old mode but it
      3 does not disable the secondary card. As a result
      4 the second card (which has some randonm CRTC timing)
      5 may produce synch pulses which are wrong for your
      6 monitor.
      7 
      8 If your monitor does not tolerate bad timing I would
      9 recommend that you don't try Multi-head yet, or at
     10 least, turn it off *before* leaving X.
     11 
     12 
     13 3.9Nl notice: There is a problem with releasing
     14 of LBX colormap privates which may cause a seg.
     15 fault when the server exits. I got a patch from
     16 Mark Vojkovich which fixes it.
     17 
     18 If you have a CL-GD5480 or CL-GD5446 ver. B you
     19 should be able to try Multi-Head with that
     20 card as a secondary. The primary card should not
     21 have any special feature. Some MainBoards may
     22 not do it right too. I tried it with a 5465 (AGP)
     23 as a primary and 5446B (PCI) secondary on an
     24 ABIT LX6 upgraded to the latest bios.
     25 
     26 Version A of the 5446 cannot be pure MMIO (The driver 
     27 requires that it is the primary display adapter).
     28 You can distinguish between the rel A and rel B by
     29 running "scanpci -v". Version 1 does not report a
     30 valid BASE1 address.
     31 
     32 The bios upgrade lets me chose if the primary
     33 display adapter is on PCI on AGP (I chose
     34 the AGP card as primary). Warning - this setup
     35 will *NOT* work with XFree86 3.3.2.
     36 
     37 The only problem that I found so far is with
     38 memory configuration initialization. My bios
     39 does not initialize the secondary display adapter.
     40 This results in a corrupted display.
     41 
     42 Here are the options:
     43 1. warm booting from Windows 98 may work. I have
     44 not tried that.
     45 
     46 2. Take out the other card and leave the 5446
     47 (or 5480) as the primary card. Start the server
     48 and watch it's output. Look for lines like:
     49   (--) CIRRUS(0): Memory Config reg 1 is 0x1B
     50   (--) CIRRUS(0): Memory Config reg 2 is 0x21
     51 Remember these values. Now edit XF86Config
     52 and add to the proper device section the lines:
     53   Option "MemCFG1" "0x1B"
     54   Option "MemCFG2" "0x21"
     55 These values are the contents of registers SR0F
     56 and SR17. (notice: the 5480 driver does not use
     57 and will not print MemCFG2).
     58 
     59 Now you can reinstall the other card (which
     60 must me set as the the primary display adaptor).
     61 
     62 A note about configuring multi-head:
     63 There should be a separate section for each
     64 adapter (device), Monitor and Screen. A "ServerLayout"
     65 section is optional (and recommended). To make it
     66 easier for XFree86 to relate device sections to
     67 actual cards, use a BusId line in each device
     68 section. XFree86 3.9N works properly if the config
     69 file is for Multi-head but it finds only one
     70 display adapter.
     71