71 lines
2.5 KiB
Plaintext
71 lines
2.5 KiB
Plaintext
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WARNING:
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On exit XFree86 restores the old mode but it
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does not disable the secondary card. As a result
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the second card (which has some randonm CRTC timing)
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may produce synch pulses which are wrong for your
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monitor.
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If your monitor does not tolerate bad timing I would
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recommend that you don't try Multi-head yet, or at
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least, turn it off *before* leaving X.
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3.9Nl notice: There is a problem with releasing
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of LBX colormap privates which may cause a seg.
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fault when the server exits. I got a patch from
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Mark Vojkovich which fixes it.
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If you have a CL-GD5480 or CL-GD5446 ver. B you
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should be able to try Multi-Head with that
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card as a secondary. The primary card should not
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have any special feature. Some MainBoards may
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not do it right too. I tried it with a 5465 (AGP)
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as a primary and 5446B (PCI) secondary on an
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ABIT LX6 upgraded to the latest bios.
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Version A of the 5446 cannot be pure MMIO (The driver
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requires that it is the primary display adapter).
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You can distinguish between the rel A and rel B by
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running "scanpci -v". Version 1 does not report a
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valid BASE1 address.
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The bios upgrade lets me chose if the primary
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display adapter is on PCI on AGP (I chose
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the AGP card as primary). Warning - this setup
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will *NOT* work with XFree86 3.3.2.
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The only problem that I found so far is with
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memory configuration initialization. My bios
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does not initialize the secondary display adapter.
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This results in a currupted display.
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Here are the options:
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1. warm booting from Windows 98 may work. I have
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not tried that.
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2. Take out the other card and leave the 5446
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(or 5480) as the primary card. Start the server
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and watch it's output. Look for lines like:
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(--) CIRRUS(0): Memory Config reg 1 is 0x1B
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(--) CIRRUS(0): Memory Config reg 2 is 0x21
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Remember these values. Now edit XF86Config
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and add to the proper device section the lines:
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Option "MemCFG1" "0x1B"
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Option "MemCFG2" "0x21"
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These values are the contents of registers SR0F
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and SR17. (notice: the 5480 driver does not use
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and will not print MemCFG2).
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Now you can reinstall the other card (which
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must me set as the the primary display adaptor).
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A note about configuring multi-head:
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There should be a separate section for each
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adapter (device), Monitor and Screen. A "ServerLayout"
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section is optional (and recommended). To make it
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easier for XFree86 to relate device sections to
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actual cards, use a BusId line in each device
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section. XFree86 3.9N works properly if the config
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file is for Multi-head but it finds only one
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display adapter.
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