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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. dx �‏ @dekisu Jan 5
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      i bought a usb type c extension cable and was expecting some weirdness because usb type c is hard, but idk what to make of thispic.twitter.com/admNXhZQ3f

      6 replies 1 retweet 39 likes
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    2. dx �‏ @dekisu Jan 5
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      oh, yep. i'm using this for a usb C hub (with PD, ethernet, vga, etc) and all the usb C features work, but the "usb 2.0" devices connected to the hub don't work unless i flip the extension cable

      1 reply 0 retweets 9 likes
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    3. dx �‏ @dekisu Jan 5
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      also the answer is on the fediverse side, thanks to @steph@iscute.moe, who is cute, dot moe.https://iscute.moe/objects/27f5f30d-e217-47b4-ae7d-4fc3c6f074f9 …

      3 replies 0 retweets 8 likes
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    4. Hector Martin‏ @marcan42 Jan 5
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      Replying to @dekisu

      The cable can't be to spec because Type-C extension cables are, by definition, in violation of the spec. It's not a CC problem. The problem is that Type-C has two sets of USB2.0 pins but only one set is supposed to be connected across the cable.

      2 replies 0 retweets 12 likes
    5. Steph‏ @senkowo Jan 5
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      Replying to @marcan42 @dekisu

      yeah, i theorised this before I heard about PD working etc. All female connectors in practice break out all 4 D+ and D- pins, and connecting them together on the female connector on the extension cable should work fine

      1 reply 0 retweets 3 likes
    6. Steph‏ @senkowo Jan 5
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      Replying to @senkowo @marcan42 @dekisu

      obviously not to spec, but i'm failing to imagine how exactly it breaks things

      1 reply 0 retweets 1 like
    7. Hector Martin‏ @marcan42 Jan 5
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      Replying to @senkowo @dekisu

      This would work for standard cables, but captive alternate mode, dock, or other detachable applications are allowed to redefine the second D+/D- pair so this could cause a problem for those.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 Jan 5
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      Replying to @marcan42 @senkowo @dekisu

      Of course those have to deal with dumb USB2.0 only Type C devices that short the pins anyway, but those wouldn't trigger the alternate mode. A hacky extension cable that shorts them *would* allow that, and that could cause a short circuit between different data lines.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 Jan 5
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      Replying to @marcan42 @senkowo @dekisu

      (This is of course quite spec-lawyering, I had to go through and check every for any allowed usage of B6/B7)

      8:36 AM - 5 Jan 2021
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      • lustrouspenguin Steph
      1 reply 0 retweets 2 likes
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        1. Steph‏ @senkowo Jan 5
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          Replying to @marcan42 @dekisu

          ah, I was looking a while ago to see if there were any actual usages of the second pin pair and couldn't find any, since all the alt modes i'm aware of still use D+/D- and support USB2

          1 reply 0 retweets 0 likes
        2. Steph‏ @senkowo Jan 5
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          Replying to @senkowo @marcan42 @dekisu

          so in this context of it being legally possible but not practically implemented i'm surprised the cable vendor chose this solution

          1 reply 0 retweets 0 likes
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