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Today’s kids don’t have to worry about turning off your PC before you can unplug your mouse or keyboard
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this post was submitted on 28 May 2026
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No. You misunderstand. I need USB-A 2.0 ports on a USB-C 3.0 adapter because USB-A 3.0 ports will steal bandwidth from the HDMI port on the adapter, causing my 30Hz issue. Therefore I need a USB-C 3.0 adapter that has a USB-A 2.0 port on it for my mouse and keyboard to prevent that from happening, allowing the HDMI port to use the full bandwidth it requires to send a 120Hz signal @ 4K. Problem is that I can't find any such adapters. But all my research says that it should exist.
Oh I think I get it.
You want a USB 3.0 hub that has only USB 2.0 ports for the peripherals so that all the bandwidth is used for HDMI and not the peripherals.
I could be wrong, but I'm pretty sure USB 3.x never supported 4k at 120hz with HDMI. Only thunderbolt could achieve this nativley.
There is a way with DP alt mode which worked using some bonus display port protocol magic which is why the suggestion is to use a DP to HDMI adapter.
Actually I'm pretty sure even DP requires at least 3.2 but I would need to check.
HDMI 4k @120Hz was added in USB 4.0 which won't work if your phone is only 3.x.
You need a hub that supports DP alt mode so that it won't downgrade the output: https://www.reddit.com/r/UsbCHardware/comments/1dahjah/psa_usbc_bus_powered_dock_with_dp_14_alt_mode/
I think yout phone needs to support it too though, otherwise it won't work.
By "USB 3.0" I should probably clarify that I meant more like 3.x, or whatever standard supports the DP standard I need to achieve at least 60Hz minimum refresh rate @ 4K (ideally 120hz but I'll take what I can get). You see, I'm old so from my perspective this USB 3+ shit still feels new and confusing for me, even having done a little bit of research. But I digress; you've pretty much got the gist of what I'm trying to say now.
Anyway I have a Z Fold 7 so I don't think my phone the limitation, here. But yes from what I understand, an adapter that supports either DP Alt Mode or DSC (Display Stream Compression) is what I need. Or both. I'm still not sure, cause one such adapter I tried claimed to support alt mode but my phone still stubbornly refused to go beyond 30hz above 1440p. I'll look into that reddit post; thank you.