https://bugs.kde.org/show_bug.cgi?id=467554
--- Comment #2 from Chema <rondo...@gmail.com> --- The HDMI EDID emulator is used for 2 functions: 1- If you use a remote control application like AnyDesk or similar, the remote computer must be receiving an HDMI signal for it to work correctly. If the computer stops receiving this signal, for example because you unplug the HDMI cable, the remote control of the computer stops working. If you have both computers plugged into a KVM switch, and from the first computer you want to remote control the second computer using one of these remote control programs, you can't do it without using a hardware emulator like this because when you activate the first computer on the KVM switch computer from which you control the second computer remotely, this remote connection does not work because the second computer stops receiving the HDMI signal (since you are receiving the HDMI signal on the first computer). What the HDMI EDID emulator does is that even if the HDMI cable is unplugged, it emulates the signal as if it continued to reach the computer, so it is believed that it is connected to a monitor and then the remote control works, although the computer does not really is connected to a monitor (or is not receiving the signal from the HDMI cable). But unlike a normal EDID emulator, this one is bi-directional, which allows the HDMI cable to be connected to it and you can quickly switch on the KVM switch to the remote computer and start receiving the HDMI signal from the monitor, just in case there is some problem that cannot be fixed from the remote control. 2- By emulating HDMI resolutions, switching between devices on the KVM switch is almost instantaneous, it only takes 1 or 2 seconds. Without this kind of emulator, switching the display between computers on the KVM switch takes a long time, about 15-20 seconds, because it has to re-receive the HDMI signal, readjust the resolution, etc. while with the HDMI EDID emulator it never loses the signal or the resolution that the equipment had, it is believed that it is always connected to a monitor, so switching between the equipment screens is almost instantaneous. In Windows this hardware works perfectly, allowing me to select any resolution that the system detects. In Linux I am having the problem that of all the resolutions that Wayland detects and offers, only Full HD, 2K and 4K resolutions work, intermediate resolutions do not work with this adapter plugged in, but this does not happen only in KDE, it happens to me also in GNOME, so I think it's more of a bug with the Linux kernel graphic driver that for some reason is not able to work correctly with this hardware. With versions prior to KDE 5.27.3, this hardware worked fine in the resolutions that I have mentioned, with the only problem that when suspending the computer in 4K resolution and turning it on, it did not receive the HDMI signal and you had to change the console by pressing Ctrl + F2, when doing so, it received the HDMI signal again and it was possible to switch to the session with KDE by pressing Ctrl + F1 and everything worked fine (but this problem did not occur in GNOME). But since KDE version 5.27.3 the 4K resolution has stopped working, when I activate it the screen stays black and does not return to the previous resolution even after 1 minute passes, forcing me to change to another console and restart the computer. Please, I don't want to sound selfish with what I'm going to say now, but this connector is only $20 on Amazon, is there any chance that I would donate the money to some KDE developer to buy this hardware so he can carry out the relevant tests? I've been having problems with this connector for more than a year and we haven't found a solution, from here the tests I can do are very limited due to my knowledge of Linux and I think that because of this, it would take a long time to find a solution. -- You are receiving this mail because: You are watching all bug changes.
