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https://access.redhat.com/solutions/222813
How to change display resolution by using xrandr ? ... $ xrandr -q Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 4096 x 4096 DVI-I-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.0*+ 1600x1200 60.0 1680x1050 60.0 1280x1024 75.0 60.0 1440x900 59.9 1280x960 60.0 1280x800 59.8 1152x864 ...
https://unix.stackexchange.com/questions/205509/running-firefox-in-xvfb-extension-randr-missing-on-display
I would file a bugreport especially as if RANDR is not supported you can assume that the resolution of the screen does not change making fallback easy. From the xserver perspective nothing would preclude you developing support for XRANDR for a virtual xserver there is little demand for it although it would be a reasonable wishlist item.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/considerations_in_adopting_rhel_8/desktop-and-graphics_considerations-in-adopting-rhel-8
Red Hat does not support migration from RHEL 7 with KDE to RHEL 8 GNOME. Users of RHEL 7 with KDE are recommended to back up their data and install RHEL 8 with GNOME Shell. ... add the local user root in the X server access control list. As a result, ... The xrandr utility is not supported because Wayland handles layout, rotations, and ...
https://bugzilla.redhat.com/show_bug.cgi?id=655212
Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
https://bbs.archlinux.org/viewtopic.php?id=141270
May 10, 2012 · Re: xrandr can't open display Are you saying not even fbdev works now? The advantage of modesetting over fbdev is exactly what the name says - modesetting. fbdev starts X at the resolution the framebuffer is currently at, and that's it. modesetting supports xrandr 1.2, which means resolution switching, including multi-monitor.
https://developer.toradex.com/knowledge-base/x-server-(linux)
The X-Server allows graphical user interfaces on a Linux system. Typically a desktop environment like Gnome, KDE or LXDE runs on top of this X-Server which allow starting other programs. If such a program is a X enabled graphical application it will connect to the X-Server directly to draw itself on the screen.
https://www.x.org/releases/X11R7.6/doc/man/man3/Xrandr.3.xhtml
Xrandr is a simple library designed to interface the X Resize and Rotate Extension. This allows clients to change the size and rotation of the root window of a screen, along with the ability to reflect the screen about either axis (if supported by the implementation).
https://askubuntu.com/questions/287096/how-to-change-the-screen-resolution-in-vnc-viewer-for-ubuntu-12-04-without-a-mon
but this does not make sense to me, if I plug in the monitor back and run the xrandr command, it works again! It seems that Ubuntu must conntect to a real monitor before I can change my resolution in …
https://www.unix.com/man-page/centos/3/Xrandr/
Xrandr is a simple library designed to interface the X Resize and Rotate Extension. This allows clients to change the size and rotation of the root window of a screen, along with …
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