On 11/6/21 03:18, Barry wrote:

On 10 Jun 2021, at 00:42, Stephen Morris <samor...@netspace.net.au> wrote:

On 1/6/21 19:19, Stephen Morris wrote:
Hi,
     I have config file in /etc/X11/xorg.conf.d that is listing modelines for 
all resolutions that xrandr indicates is supported by the vmware video driver. 
With that file existing can anyone suggest why Gnome in Xorg will scale to 4k 
resolution when the desktop is scaled, but Plasma in X11 will not scale?
The issue with this was that Gnome and KDE resolutions in the vm are not the 
same. Under Gnome, when the vm window is maximised to 3840x2160 (4K) the 
maximum available space that Gnome can be scaled to without getting horizontal 
or vertical bars is 3840x2075, but under KDE, for the same vm window size, the 
maximum resolution KDE can be scaled to is 3840x2069. The question now is why 
is there this sizing difference between Gnome and KDE?
In order to get KDE to scale properly, even to fullscreen when the vm conf was 
set to full screen, was to add more modelines into the xorg config file for the 
additional resolutions (these were not required with Gnome).
The other issue I encountered was that Fedora is not setting up valid video 
resolutions for the monitor I have. Part of this could be that Fedora has no 
idea what the monitor is because it doesn't have specific support for it, the 
other part is it is making invalid assumptions about the monitor capabilities. 
A lot of the resolutions Fedora is setting up are 16:10 resolutions, which for 
my monitor which is 16:9 are not valid.
The monitor is responsible for reporting it’s mode information to the operating 
system using EDID packages. I don’t recall that kernel having any quirks for 
monitors, but it has been a while since I worked closely with EDID.

If the mode lines are wrong then the monitor is first thing to suspect.
Look in dmesg for errors include edid in the line.

Under x11 you can use xrandr —verbose to get the EDID information.
There is tool ediddecode (?) that will decode the hex dump you get.
Thanks Barry, I'll check that out. I am using a 4K monitor that has HDR capabilities which, like windows, I won't get that functionality in linux without a monitor specific driver, which doesn't exist for linux. I'm not sure whether the issue I'm seeing is Fedora or the vmware video driver, but I also get the same issues if I use Virtualbox instead of Vmware Player. Before I put the xorg modelines in place xrandr would not list the 4K resolution as being a resolution that was achievable.

regards,
Steve


Barry

regards,
Steve

regards,
Steve
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