Kernel parameter to prioritize VGA over GPU output

Elliott B

5/13/23, 8:08 PM

I have a Supermicro server with a display attached to the Nvidia GPU HDMI output, but I am working remotely with IPMI connection. So I need to boot Ubuntu with the output going to VGA, or else the IPMI remote console is just black. I figured out how to do this in grub, by setting terminal_output vga_text so now I see the grub menu on the IPMI console. But as soon as it starts booting linux my screen goes black, and the output is shown only on the HDMI display. Is there a kernel parameter to prioritize VGA over GPU output? It works fine if I physically unplug the HDMI but that's not always practical with remote hands.

I've tried like this, which I expect to disable HDMI and force enable VGA but it doesn't work, I still get display out HDMI only.

$linux_cmd /live/vmlinuz boot=live console=ttyS1,115200n8 union=overlay username=user hostname=impish config quiet components noswap edd=on nomodeset enforcing=0 noeject locales= keyboard-layouts= ocs_live_run="ocs-live-general" ocs_live_extra_param="" ocs_live_batch="no" video=VGA-1:800x600@60me video=HDMI-1:d toram=live,syslinux,EFI,boot,.disk,utils ip= net.ifnames=0  splash i915.blacklist=yes radeonhd.blacklist=yes nouveau.blacklist=yes vmwgfx.enable_fbdev=1

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Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Kernel parameter to prioritize VGA over GPU output

TH: พารามิเตอร์เคอร์เนลเพื่อจัดลำดับความสำคัญ VGA มากกว่าเอาต์พุต GPU

RO: Parametru kernel pentru a acorda prioritate ieșirii VGA față de GPU

RU: Параметр ядра для приоритета VGA над выводом GPU

VI: Tham số hạt nhân để ưu tiên đầu ra VGA hơn GPU

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