Does it support native macOS containers?

It does not. It works through Docker Desktop, Orb Stack, or Colima on macOS.

5k might be a different story, are you actually running it at 5120p with 2.0 scale? You can get that from running `system_profiler SPDisplaysDataType`, if you are running HiDPI with 5k that'd show something like Resolution: "10240 x 5760", UI Looks like "5120 x 2880"

The 4 values in MaxSrcRectWidthForPipe are sub-pipes within each display controller, not separate display outputs. Every external display controller on the M5 Max has the same pattern: sub-pipe 0 = 6720, sub-pipes 1-3 = 7680. A single-stream 4K display only uses sub-pipe 0. Sub-pipes 1-3 are for multi-pipe configurations (8K displays use 2 sub-pipes, which is why an 8K EDID causes the DCP to assign PipeIDs=(0,2) with MaxPipes=2).

Your scaler clock theory could be right: the single-stream scaler path may genuinely have a lower throughput limit than the multi-pipe path.

Interestingly, the M2 Max uses a completely different IOMFBMaxSrcPixels structure. Instead of per-sub-pipe arrays, it has a flat MaxSrcRectWidth=7680 and MaxSrcRectTotal=33177600 (exactly 7680x4320) per controller. Every external display controller gets the full 7680 budget. Apple seems to have restructured the display controller architecture between M2 and M4/M5 to per-sub-pipe budgets, and the single-stream sub-pipe got a reduced allocation (6720 vs 7680) in the process. Whether that's a hardware change in the scaler or a firmware allocation policy is hard to say without Apple's documentation.

Without it - running 2160p@1x results in very low quality text rendering on macOS.

Yeah that would work, that's just 2k HiDPI, not 4k HiDPI.

I tried quite a few things in the "Advanced" section of BetterDisplay - is there something specifically you're suggesting?

I’m not talking of BetterDisplay. I’m talking about Apple’s UI. Scroll down the content of the “Displays” pane, and you find a row of buttons “Advanced…”, “Night Shift…” and “?”

Ofcourse this has been tried, the highest possible resolution with HiDPI is limited to what the article says.

Parts of it were pasted from my Claude Code Logs, Parts were written by me - and the table - that was me!

Unfortunately BetterDisplay cannot set HiDPI @ 4K on the M5 machines - that was the first thing I tried.

Sure, and that is the real tragedy here. The person I'm replying to is just pointing out that native support for high res sucks, which is true, but the real problem is what limits there are on 3rd party support.

Hey, thanks I hadn't tried screenresolution but that seems to simply set the resolution and refresh rate without controlling the scaling which is what is needed for configuring the HiDPI mode scaling.

I don't expect emails to get through to busy CEOs of huge companies like Apple unless you're really lucky and they make it through some automation, but I have dropped him an email just in case. I guess you never know.

He has an army of people that would read his emails. A truly important one should get read.

You could always try calling, too! I cold called Marc Benioff at Salesforce and he actually picked up the phone.

This needs a story. What did you say to him?

This was maybe 20 years ago. I was looking for a job as a recruiter and just called him. He referred me to an HR rep and I did get an interview from it. Didn’t get the job, but hey, I got a shot!

He was told, he had a call from Pope

Heh, classic Mike (not the Pope one)

I did it once, I'm pretty much sure Tim did not read the email, why would he, someone in his team did. I had an awful experience with AASP, no computer, no fix, no timelines (and money was tight), tried to escalate as much as I could and failed. Wrote to Tim Cook, explaining my situation and attaching all references... Got a call from Apple within like 2h, got a brand new Mac in a day. Those emails do work.

Has anyone tried sending an email to Nadella telling him that Windows is terrible now?

What if that was all it took.

I think you'd want to offer morethan a problem statement when taking CEO time. Yes it's broken because shareholders demand M$ products have AI feature so that the share price has the 'AI' multiple. It's pretty hard to justify the stock price, even with the current, high earling from the cloud so they are looking for hte next golden goose

Bill Gates couldn't get it done.

https://www.techemails.com/p/bill-gates-tries-to-install-mov...

I once had a terrible experience dealing with my local Apple Store and then a hostile call with an Apple Retail manager after I left critical feedback.

I emailed Cook, mostly just to shout into the void. Within a week I got a call from Apple Corporate, they gave me an appointment the next day and my hardware issue was suddenly solved over-night.

Helps if there are support case numbers with attempted diags, maybe.