AGP + PCIe on Multiboot system - Force default graphics adaptor? \ VOGONS

AGP + PCIe on Multiboot system - Force default graphics adaptor?

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First post, by Tmp2k

Posted on 2018-02-16, 23:30

Tmp2k Offline

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I've got a system that boots all versions of Windows. It has an AGP TNT2 and a PCIe 9600 GSO. BIOS is set to boot from AGP. So DOS, Win3.1, Win9x etc all work fine. Win2K and WinXP boot from AGP but as soon as the bootloader has finished and Windows takes over it switches to PCIe. In 2K and XP I just installed the 9600 rivers and disabled the TNT2 in device manager and it worked.

Win7 will not let me choose the 9600 as the display adaptor unless I set BIOS to boot from PCIe. This is really annoying as it all works perfectly in 2K and XP!!!

Any ideas how I can force Win7 to use the 9600 on PCIe instead of the AGP card? Even if I disable the TNT2 in hardware manager, it still boots up using generic VGA, it shows the 9600 but you can't even add it as a second display.

Reply 1 of 5, by weldum

Posted on 2018-02-17, 19:35

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what if you put the PCIe as primary and the AGP and secondary? Does DOS, 3.1 and 9x work wrong?
Because i've had some boards that only started the GPU when a monitor was connected

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Reply 2 of 5, by Davros

Posted on 2018-02-17, 20:01

Davros Offline

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enable the agp card uninstall the drivers
shut down, remove agp card
boot into win 7 install ati drivers, reboot
shut down
insert agp card - do not install drivers

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Reply 3 of 5, by Tmp2k

Posted on 2018-02-17, 23:42

Tmp2k Offline

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weldum wrote:
what if you put the PCIe as primary and the AGP and secondary? Does DOS, 3.1 and 9x work wrong?
Because i've had some boards that only started the GPU when a monitor was connected

If I set PCIe as primary then DOS, 3.1 and Win9x just use that GPU instead

Davros wrote:
enable the agp card uninstall the drivers shut down, remove agp card boot into win 7 install ati drivers, reboot shut down inser […]
Show full quote
enable the agp card uninstall the drivers
shut down, remove agp card
boot into win 7 install ati drivers, reboot
shut down
insert agp card - do not install drivers

I've tried that but as soon as I set bios to boot from AGP that's all win7 will let me use.

I'm wondering if there's a registry setting or something that I can do force Win7 to use a particular device, they both appear in device manager so it knows they are there.

Reply 4 of 5, by agent_x007

Posted on 2018-02-18, 11:47

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I had the same problem with my system.
Windows 7 is simply dumb this way.
I simply gave up, and used primary PCI-e card in Win 7 with my Hex Boot system (I used 7800 GTX and GTX 780 Ti combo). Here's my thread (if you are interested) : LINK

Just FYI : Windows Server 2016 didn't have this problem (Win 10 shouldn't as well).

Reply 5 of 5, by Tmp2k

Posted on 2018-02-18, 14:42

Tmp2k Offline

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Posts: 55
Joined: 2017-10-21, 20:10

Damn, that's annoying! I'd not got to installing Win10 yet, but I might give it a go now, see if it solves the problem. It will be interesting to see what Vista and Win8 do too.

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