RC15

it’s done the business and found many lovely modes

Possibly – all less than or equal to 1920×1080 though, apart from the missing three. When I eventually did get 3840×2160 working on Auto (Philips FTV) the mode selector said it was 30 Hz, but the monitor reported 24 Hz*. My own MDF has a lot of modes between 1920×1080 and 3840×2160 all of which work perfectly well, but also only at 24 Hz. This isn’t a fault with the monitor’s reporting: it reports 30Hz when it’s being driven by the Mac, which also says it’s delivering 30Hz.

In that case, GPUMode_Vet will be using the built in defaults of 1920×1200 and 25MHz-162MHz.

As it came out of the box, RC15 started up on this monitor at something like 640×480 or 768×512, I’m not sure exactly what. Certainly not 1920×1200 or even 1920×1080. But it did allow me to select 1920×1080, or 1920×1200 if I configured it for a different monitor – but then reverted to the lo res on reboot.

All is fine now though with my own CONFIG/TXT and disable_mode_changes in CMDLINE/TXT. Auto (Philips FTV) works fine, but doesn’t give me some of the modes I want, but I’ve written my own MDF which does (see above, but I’ve actually added a couple more: 2880×1620 and 3520×1980).

* It’s probably just as well it’s only working at 24Hz – this is still pushing the Pi pixel clock at almost 200MHz – nearly 25% more than its spec.

As it came out of the box, RC15 started up on this monitor at something like 640×480 or 768×512, I’m not sure exactly what. Certainly not 1920×1200 or even 1920×1080. But it did allow me to select 1920×1080, or 1920×1200 if I configured it for a different monitor – but then reverted to the lo res on reboot.

This is what I am experiencing, and it’s kind of putting me off migrating to RC15 as standard. Which is a shame because my monitor does 2560×1440 and even with changes to config/txt I can’t use it unless I go through the palaver of disabling mode changes and finding a suitable MDF. Even if I do a SaveModeFile, I don’t get a 1920×1080, or a 2560×1440, both of which are found by Windows using EDID.

Is there a workround that doesn’t involve this – it came as a shock to me after RC14 defaulting to 1920×1080 to suddenly be presented with 640×480.

EDIT: After many attempts to get this to work, I just managed it! In no different way to what I think I’ve done several times before, but suddenly it worked! Wouldn’t you know it – just after I’d posted here whinging about it. And it corrected the “half and half” boot screen I kept experiencing!