Post AZ9ld458yAXHjXbIuW by Elbrar@furry.engineer
(DIR) More posts by Elbrar@furry.engineer
(DIR) Post #AZ8hxkNSpcSHjAogVc by foone@digipres.club
2023-08-27T00:28:44Z
0 likes, 1 repeats
I have a USB-C cable that only works one way. You plug it in, no charging. Flip it 180, It works fine.This seems wrong
(DIR) Post #AZ8i3COC6zsC3Jl2Zc by viq@social.hackerspace.pl
2023-08-27T00:31:57Z
0 likes, 1 repeats
@fooneI heard a few people tell me about plugging their phone into a powerbank, only later to find the phone drained and the powerbank more full than it was before.
(DIR) Post #AZ9WTNd3wN089KOEcq by ignaloidas@not.acu.lt
2023-08-27T10:02:34.167Z
0 likes, 0 repeats
@foone@digipres.club actually, that sounds like a broken device on one end, USB-C cables are intentionally asymmetric (so that you can figure out which high speed lanes are which on each end), and the devices should be handling it, but it sounds like they don't.What's likely happened is that one of the required 5.1k resistors on the device charged has been knocked off or otherwise not connected, and the charger can no longer detect the device in one of the orientations.
(DIR) Post #AZ9ZiG64Wi9ezlkFtI by ignaloidas@not.acu.lt
2023-08-27T10:38:52.028Z
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@foone@digipres.club Some figures to illustrate the built-in asymmetry from the USB-C spec. There's only 1 CC line in cable even though there's 2 pins it can connect on the socket. One is used for communication between devices, the other may be used for powering the e-marker chip in the cable (if it exists). Cheap USB-C cables won't even have the Vconn line at all because there's no need for it if you just use the most basic cable variant that doesn't need e-markers (USB 2 data only, up to 60W of power).
(DIR) Post #AZ9kCy0gp1Y3Q1VceW by jpm@aus.social
2023-08-27T00:39:12Z
0 likes, 0 repeats
@foone dead CC line
(DIR) Post #AZ9kCyr9fxW22k3WQi by ignaloidas@not.acu.lt
2023-08-27T12:36:28.615Z
0 likes, 0 repeats
@jpm@aus.social @foone@digipres.club dead CC line would lead to no charging at all, since there's only one in the cable (cable is asymmetric)this is totally one of the device's fault.
(DIR) Post #AZ9ld458yAXHjXbIuW by Elbrar@furry.engineer
2023-08-27T03:13:45Z
0 likes, 0 repeats
@foone I have a USB A to USB C adapter that run at 3.0 in one orientation and only 2.0 in the other. Makes no sense.This is marked as such, so it's intentional.
(DIR) Post #AZ9ld4pECpOo2TA6k4 by ignaloidas@not.acu.lt
2023-08-27T12:52:23.447Z
0 likes, 0 repeats
@Elbrar@furry.engineer @foone@digipres.club Huh, that's weird. The device on the USB C end should have a switch to correct for cable orientation anyways (unless it has a captive cable, in which case it can ignore the fact that cable can flip because the host must have a mux anyways).Unless it's a USB C port (aka extension cable) which is pretty much illegal under USB C (unless you fake a USB hub in there, which some do, but not many).
(DIR) Post #AZD9rf7p1NIN37E7EW by Elbrar@furry.engineer
2023-08-29T04:03:20Z
0 likes, 0 repeats
@ignaloidas When have specifications ever stopped China?The device is use this with (an SD card reader) has a captive cable. I've just marked them both with the correct orientation.
(DIR) Post #AZD9rfkogOUH03TG0u by ignaloidas@not.acu.lt
2023-08-29T04:08:03.829Z
0 likes, 0 repeats
@Elbrar@furry.engineer aaahhhh, USB-C socket. The classic problem bringer, there's a bunch of good reasons why "simple" cables/adapters with them just aren't allowed under spec, and this is one of them.Now, for the funnies, that label is (rarely) wrong, as the device could have both lanes wired up, at which point both orientations would give 10Gbps speed :xdd:
(DIR) Post #AZDaD8jQjmD9lIifqa by Elbrar@furry.engineer
2023-08-29T04:59:35Z
0 likes, 0 repeats
@ignaloidas It definitely does not perform the same both ways. I was very confused why it was _slower_ with an SDXC card than the also USB 3.0 non-SDXC reader it replaced until I figured that out.It's an annoyance but I only ever need this with my desktop since that only has one Type C port and it's inconviently located.
(DIR) Post #AZDaD9VdqWmAApHAzg by ignaloidas@not.acu.lt
2023-08-29T09:03:17.541Z
0 likes, 0 repeats
@Elbrar@furry.engineer It would only perform the same way if you used a device that you would never use with such adapter, as it would need to support at least 20Gbps speeds, which basically limits that to docks/hubs.