After installing CheriBSD and the Cheri Desktop Environment and rebooting, the monitor will no longer accept the generated GPU/DPU signal. The monitor generates "Input Signal Out Of Range". I have tried a high resolution monitor (QHD: 2560 x 1440) and get the same result as a 1920x1200 monitor. Both monitors are HP brand and appear to operate at 60Hz with Horizontal bandwidth varying around 65kHz or so and Vertical bandwidth variable around 48Hz range.
Prior to installing the Cheri desktop, I was not having any problem viewing the boot menus or directly accessing CheriBSD without the desktop environment. Any ideas on what the Cheri Desktop Environment might be doing to the graphics output? I have updated to the latest firmware release and installed the latest CheriBSD release (22.12).
Resolutions other than 1080p are not well supported currently by the driver
This would be good to put somewhere in the documentation (along with the system being inoperable as shipped until you update the firmware).
In my case, I swapped to an even older monitor and no longer get the signal out-of-range message, but I still get a blank screen when the desktop is expected to appear. Interestingly, the normal login text is displayed just before the screen goes blank. Also, the signal goes missing for a short time after it's blank for a moment. No amount of keyboard interaction (such as logging in without seeing the prompt, escape key, etc.) results in a desktop. Does the desktop environment not work if the video group is empty? Does root need to explicitly be placed in the video group? Is moused required?
MLittle said:Does the desktop environment not work if the video group is empty?
Not if you want to log in as an unprivileged user. To quote our CheriBSD Getting Started guide: "In order to be able to use the keyboard and mouse when logged in via the Simple Desktop Display Manager (SDDM), users must be in the video group. If users were added earlier, you will be prompted to select ones to add to the group.
MLittle said:Does root need to explicitly be placed in the video group?
I do not believe so, but KDE itself does not fully support being run as root, so do not do that. I don't recall if I tested it, given that things like Dolphin will shout at you if you do.
MLittle said:Is moused required?
No, but if you are logged in as an unprivileged user not in the video group, you will not be able to use the keyboard or mouse, as per the CheriBSD Getting Started guide quoted above.
Interesting. While I initially left the video group empty, I had expected some sort of desktop login from the SDDM. Instead, I get a blank screen that overwrites a terminal looking login prompt.