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Due to Covid, I have had time to reinvigorate my knowledge and exploration of computers in general and Linux OSes. Part of this has been in obtaining, (on the cheap), odd ball micro/mini PCs. I stress these "odd ball", non name devices. Recently I obtained a couple of dual LAN Celeron computers and ultimately learned that these PCs have onboard dual graphics capability with a default monitor and graphics card/device of an LCD or flat screen monitor to be attached via an onboard (on the motherboard), inline connector.

When attempting to install ClearOS, I get the boot menu to install or test the CD and etc., I get CD-ROM activity as it starts to load then my VGA connected monitor goes black and states no signal. I simply cannot install ClearOS. I ran a live CD of one of the Ubuntu flavors and learned via this, since the VGA monitor came up as monitor 2 and I could set Ubuntu to swap and/or combine monitors. Never did see any Linux output while the CD was booting. To make a long story short:

I 'think' I have seen somewhere that one can, during the boot process even from a CD/DVD, edit or configure the boot, via grub or grub.conf, to do certain things. My Googling has not provided anything on this that I can implement or understand... yet, especially since I am booting an install OS from CD/DVD.

My question is: Is there a way to tell the installation media to ignore display 1 or graphics card 1? I know a lot will be thinking, change it in the BIOS. I have tried every combination under the display device, to the point I had to reset the BIOS by pulling the battery. I have no idea where the CMOS clear pins are or if the board has a graphics disable pin(s) somewhere.

Thanks so much for your thoughts on this!

John
Friday, September 18 2020, 03:09 AM
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  • Accepted Answer

    Saturday, September 19 2020, 01:57 AM - #Permalink
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    You are welcome John. Be sure to update us with any progress you make and any major problems encountered along the way on your journey.

    Thinking about it some more, personally would probably go with option4. In addition, while Ubunbtu was running use randr to find the diplay names eg VGA-1 DP-1, HDMI-1 etc and supported resolutions. Next, install ClearOS on a compatible machine. Add a lightweight desktop GUI to ClearOS such as xfce4. Then setup the system to load into the Graphics screen running xrandr at desktop startup to enable the screen mirror option for Screen1 and Screen2 using the Display names gained from Ubuntu. This way you can administer the system locally, if required, as well as remotely when the disk is transplanted into the "odd-ball" system.
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  • Accepted Answer

    Saturday, September 19 2020, 12:47 AM - #Permalink
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    Thank-you Tony!

    You have given me some great ideas in which to pursue my learning!!

    John
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  • Accepted Answer

    Friday, September 18 2020, 08:00 AM - #Permalink
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    Did your Ubuntu install come up with a GUI - if so displays are likely controllled by a progran called xrandr which enables dual sceens, setting graphics resolution, which is primary screen, whether screen 1 is to the left or right of screen 2 etc. You can even make up your own screen resolutions within reason...

    An idea or two...

    1. Use vnc and remotely control the install. Seach "install centos 7 using vnc"
    2. Use a rs232 port and serial terminal or PC with terminal program. Search "install centos 7 using serial terminal"
    3. Use a kickstart file see for example Kickstart

    No idea whether the code do this has been retained by ClearoS and works. Also the first two will require supported ports and drivers for NIC or RS232 port.

    4. Do an Ubuntu install to find the NIC and Disk Drive hardware and the loaded drivers to support them. Find a machine which has a working display during ClearOS install and which has hardware that will load the same NIC and Disk Drive drivers. Install ClearOS on the compatible machine, then remove the drive and install in the odd-ball machine. It should boot and use your dhcp server log to find the ip address assigned, or assign a fixed ip address before moving. You should then be able to control remotely from another machine over your network.

    5. Install Ubuntu, or any distribution that installs to a GUI with output you can see, and install and run ClearOS in a VM
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