Comment by shrikant | Hacker News Reader

Comment by shrikant | Hacker News Reader

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You can get this information from the "System Information" app in macOS as well. (At least, that's what it's called in Ventura...)

It should be under Hardware -> Power, in the section titled "AC Charger Information".

You should also be able to see connected USB-C cable capacity under Hardware -> USB. For example, mine says the following:

  USB 3.1 Bus:

    Host Controller Driver: AppleT8112USBXHCI

  USB3.0 Hub:

    Product ID: 0x0813
    Vendor ID: 0x2109  (VIA Labs, Inc.)
    Version: 90.11
    Speed: Up to 5 Gb/s
    Manufacturer: VIA Labs, Inc.
    Location ID: 0x01200000 / 2
    Current Available (mA): 900
    Current Required (mA): 0
    Extra Operating Current (mA): 0

  USB2.0 Hub:

    Product ID: 0x2813
    Vendor ID: 0x2109  (VIA Labs, Inc.)
    Version: 90.11
    Speed: Up to 480 Mb/s
    Manufacturer: VIA Labs, Inc.
    Location ID: 0x01100000 / 1
    Current Available (mA): 500
    Current Required (mA): 0
    Extra Operating Current (mA): 0

Any way to do similar for DP/HDMI? I've thrown away multiple cables cause I couldn't tell if the cable was just old and didn't support what I needed vs somehow broken. Looking at system report I only see `Graphics/Displays` which show's monitor capabilities but not cable. (I'm not actually sure if DP/HDMI advertise their capabilities in the same manner as USB 3).

Much like GP I've taken to labeling newly bought cables with a label maker to avoid wasting them in the future due to being unknown.

There’s an okay video from LTT where they hire or buy an expensive tester for HDMI cables. Seemed to be a a bit of a dark art.

yeah I've seen that, would be awesome to have access to it but not worth the cost to me, was less interested in stress testing does this 100% meet spec and more interested in "this labels itself as HDMI v{X} with optional features {y}, {z}".

I mostly care as my current monitor requires HDMI 2.1/Display Port 1.4 and going through my random cables drawer was extremely tedious. As I had way to many cables.

DP and HDMI cables are mostly passive with no identifying chip, so the only way to determine their bandwidth electronically is to try to bring up the link at that speed.

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