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Mutliple graphics cards on boot, select graphics card?
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R0b0t1
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Joined: 05 Jun 2008
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PostPosted: Wed Apr 26, 2017 11:24 pm    Post subject: Mutliple graphics cards on boot, select graphics card? Reply with quote

I have an integrated Intel GPU and an EVGA E-GEFORCE 9600 GT. If I put the NVIDIA card into the computer the UEFI firmware seems to only use the supplied card, and I see video output from the card up until I try to load my kernel, which does not have a driver configured for that card. I simply want the card available for after I boot so that I can give it to a VM.

Is there anything I can change or is this impossible with my current motherboard firmware?
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DONAHUE
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PostPosted: Fri Apr 28, 2017 12:57 pm    Post subject: Reply with quote

What is the make and model of your motherboard? The point of the question being whether your motherboard supports intel integrated graphics or not. Is your display connected to the motherboard backplane or to the EVGA E-GEFORCE 9600 GT backplane? Does your UEFI/BIOS have choices regarding display adapters?
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R0b0t1
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PostPosted: Sat Apr 29, 2017 1:02 am    Post subject: Reply with quote

DONAHUE wrote:
What is the make and model of your motherboard? The point of the question being whether your motherboard supports intel integrated graphics or not. Is your display connected to the motherboard backplane or to the EVGA E-GEFORCE 9600 GT backplane? Does your UEFI/BIOS have choices regarding display adapters?


MSI Z87-G45. Yes, the iGPU is supported (I am currently using it) it's just that when the discrete card is plugged in it is used preferentially and I need to run the cable to the discrete card. Apparently there should be a setting in the motherboard firmware for adapter preference but I don't remember seeing one. Searching in this vein leads me to believe that it's more common to be only able to use the discrete adapters, if they are available.
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DONAHUE
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PostPosted: Sat Apr 29, 2017 12:36 pm    Post subject: Reply with quote

The motherboard manual has:
Quote:
▶ Integrated Graphics Configuration
Adjusts integrated graphics settings for optimum system. Press <Enter> to enter the
sub-menu.
▶ Virtu Technology [Disabled]
Virtu Technology is a useful graphics computing mechanism for improving
performance in d-Mode or saving power in i-Mode.
[Disabled]
Disables the Virtu Technology.
[i-Mode]
Enables Virtu i-Mode technology. It provides power saving feature.
[d-Mode]
Enables Virtu d-Mode technology. This is for demanding 3D gamers
to achieve uncompromised 3D performance of discrete GPU that be
installed in the system.
▶ Initiate Graphic Adapter [PEG]
Selects a graphics device as the primary boot device.

[IGD]
Integrated Graphics Display.
[PEG]
PCI-Express Graphics Device.
▶ Integrated Graphics Share Memory [64M]
Selects a fixed amount of system memory allocated to the onboard graphics. This
item defines the exact memory size shared to the onboard graphics. [Options: 32M,
64M, 128M, 256M]
▶ DVMT Memory [256MB]
DVMT memory can dynamically allocate system memory for running graphics-
intensive applications, such as 2D/3D games. [Options: 128MB, 256MB, Maximum]


There was a time when the motherboard had a jumper or two to select integrated or separate graphics ....
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R0b0t1
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PostPosted: Sun Apr 30, 2017 3:58 am    Post subject: Reply with quote

Is it not possible to revert after boot for some reason? I never receive any output from the iGPU, even after the kernel has presumably tried to initialize the Intel graphics processor.
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Jaglover
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PostPosted: Sun Apr 30, 2017 4:49 am    Post subject: Reply with quote

Does your iGPU show up in lspci when the add-on card is installed? Some firmwares disable integrated graphics when add-on card is detected.
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unixlike
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PostPosted: Sun Apr 30, 2017 11:49 am    Post subject: Reply with quote

IGD Multi-Monitor [Disabled] -> [Enabled] ?
Enables or disables the multi-screen output from integrated graphics and external graphics card. Hardware-wise, both of the graphical ports should work.
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