I hesitate trying to answer this question because what I am doing may be wrong.
I tried the following on F18. I edited the line, found in file /etc/default/grub, which starts GRUB_CMDLINE_LINUX="rd.md=0 ... rhgb quiet" appending strings so it had GRUB_CMDLINE_LINUX="rd.md=0 ... rhgb quiet" drm_kms_helper.edid_firmware=edid/1024x768.bin video=VGA-1:e I next edited any existing lines in /boot/grub2/grub.cfg that had the string "rhgb quiet" to include the drm_kms_helper.edid_firmware=edid/1024x768.bin video=VGA-1:e string which I since learned is the wrong things to do. >From my limited understanding, /boot/grub2/grub.cfg is auto-generated using /etc/default/grub each time /boot/grub2/grub.cfg is recreated. I should have used the grub2-mkconfig command instead of editing /boot/grub2/grub.cfg directly. I got this idea reading https://wiki.archlinux.org/index.php/Kernel_Mode_Setting#Forcing_modes_and_EDID and https://www.osadl.org/Single-View.111+M5b7fe294ea7.0.html In my case I wish to run a headless server, but wish to have Linux believe there is a certain size window if I vnc into the server using x11vnc on the server. My vnc client happens to run on a laptop with a screen size, 1024x768. I do not know if you need the video=VGA-1:e because you indicated you have a monitor connected. I do not know if you can use one of the four standard timings that are hard-coded in the driver. Please note: there are notes saying this works only with certain drivers. I am using the nouveau driver. I don't know if this works if you are using the nvidia driver; a note in one of the URLs said it did not work with the nvidia driver at one time. Please save any files before editing. You and I don't know if this will work for you. It's best to play it safe and have backups just in case. > >
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