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>HDMI provides power - that's how old chromecasts can work without a separate power plug. I still have the first Chromecast released, it doesn't operate withou

by gbil 2y ago

>HDMI provides power - that's how old chromecasts can work without a separate power plug. I still have the first Chromecast released, it doesn't operate without external power plugged in so I'm not sure about the validity of your comment, at least for the chromecast part

bradfitz 2y ago
https://www.hdmi.org/spec21sub/cablepower https://www.hdmi.org/spec21sub/cablepower
- rzzzt 2y ago
  Connection is the same as attaching an ordinary, "wired" HDMI Cable, except that active cables can only be attached in one direction: One end of the cable is specifically labeled for attachment to the HDMI Source (transmitting) device, and the other end of the cable must be attached to the HDMI Sink (receiving) device. If the cable is attached in reverse, no damage will occur, but the connection will not work. HDMI Cables with HDMI Cable Power include a separate power connector for use with source devices that do not support the HDMI Cable Power feature. This is not your run-of-the-mill HDMI cable for sure.
- numpad0 2y ago
  No, not that feature. HDMI supported 5V/55mA power out for years. It's meant for EDID ROM chips and maybe HDMI selectors too, not Linux based computers, but some TVs could take it in gross violation of specifications and its spirits.
nosrepa 2y ago
And the serial number of that power plug is MST3K-US
kuschku 2y ago
The first chromecast actually operated without external power, but it only worked with some TVs. It's possible yours didn't provide enough power via HDMI, but at least ours worked just fine.
- ssl-3 2y ago
  It is possible that your memory of a device from a decade ago is faulty. No Chromecast has ever been able to be powered by HDMI alone. That has never been a thing. You may instead by remembering the fact only some TVs back then were successful at powering the Chromecast without an external power brick, using a USB port on the TV itself to power up the Chromecast. In applications where this worked (and it often did work, although it also often did not work), it could provide a solution that existed entirely on the back of the TV with nothing additional plugged into the wall. But it was still [micro] USB that provided the power to the OG streaming stick, not HDMI.
  - kuschku 2y ago
    > It is possible that your memory of a device from a decade ago is faulty. No Chromecast has ever been able to be powered by HDMI alone. That has never been a thing. It is not - I still use my 11yo Chromecast Gen1 today. And it still works fine without USB power (as long as you don't try to play YouTube videos).
    - ssl-3 2y ago
      [flagged]
    - altcognito 2y ago
      I also had this device and would concur it was supposed to work without USB power, but in my experience worked extremely poorly.
  - lightedman 2y ago
    "You may instead by remembering the fact only some TVs back then were successful at powering the Chromecast without an external power brick, using a USB port on the TV itself to power up the Chromecast." I'm looking at my first gen plugged into the ARC HDMI port on my Vizio TV. It is ONLY attached to the HDMI port and nothing else.
    - 2y ago

by gbil 2y ago

bradfitz 2y ago

https://www.hdmi.org/spec21sub/cablepower https://www.hdmi.org/spec21sub/cablepower

rzzzt 2y ago
Connection is the same as attaching an ordinary, "wired" HDMI Cable, except that active cables can only be attached in one direction: One end of the cable is specifically labeled for attachment to the HDMI Source (transmitting) device, and the other end of the cable must be attached to the HDMI Sink (receiving) device. If the cable is attached in reverse, no damage will occur, but the connection will not work. HDMI Cables with HDMI Cable Power include a separate power connector for use with source devices that do not support the HDMI Cable Power feature. This is not your run-of-the-mill HDMI cable for sure.
numpad0 2y ago
No, not that feature. HDMI supported 5V/55mA power out for years. It's meant for EDID ROM chips and maybe HDMI selectors too, not Linux based computers, but some TVs could take it in gross violation of specifications and its spirits.

nosrepa 2y ago

And the serial number of that power plug is MST3K-US

kuschku 2y ago

The first chromecast actually operated without external power, but it only worked with some TVs. It's possible yours didn't provide enough power via HDMI, but at least ours worked just fine.

ssl-3 2y ago
It is possible that your memory of a device from a decade ago is faulty. No Chromecast has ever been able to be powered by HDMI alone. That has never been a thing. You may instead by remembering the fact only some TVs back then were successful at powering the Chromecast without an external power brick, using a USB port on the TV itself to power up the Chromecast. In applications where this worked (and it often did work, although it also often did not work), it could provide a solution that existed entirely on the back of the TV with nothing additional plugged into the wall. But it was still [micro] USB that provided the power to the OG streaming stick, not HDMI.
- kuschku 2y ago
  > It is possible that your memory of a device from a decade ago is faulty. No Chromecast has ever been able to be powered by HDMI alone. That has never been a thing. It is not - I still use my 11yo Chromecast Gen1 today. And it still works fine without USB power (as long as you don't try to play YouTube videos).
  - ssl-3 2y ago
    [flagged]
  - altcognito 2y ago
    I also had this device and would concur it was supposed to work without USB power, but in my experience worked extremely poorly.
- lightedman 2y ago
  "You may instead by remembering the fact only some TVs back then were successful at powering the Chromecast without an external power brick, using a USB port on the TV itself to power up the Chromecast." I'm looking at my first gen plugged into the ARC HDMI port on my Vizio TV. It is ONLY attached to the HDMI port and nothing else.
  - 2y ago