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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. Hector Martin‏ @marcan42 9 Jul 2020
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      Meanwhile, an upgraded 2015 Retina 27" iMac might become my main computing device (because a friend is getting rid of one), and if so, I've decided I'm sorting out the HDD temperature sensor nonsense, because apparently nobody has reversed that yet?

      6 replies 0 retweets 29 likes
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    2. Pablo‏ @PablockMS 9 Jul 2020
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      Replying to @marcan42

      The stock HDD has a special firmware that reports temperature as a variable resistance over the mystery pins at the back. iirc you can just solder together the two wires and the SMC will read 0c and the fan will not scream. iirc2 that is Apple's procedure w/ stock SATA SSD.

      3 replies 0 retweets 4 likes
    3. ⓣⓞⓜ‏ @tomtastic 9 Jul 2020
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      Replying to @PablockMS @marcan42

      Think I used a 2N3904 with emitter on the grey wire, base and collector joined to the black wire when I replaced the drive with an SSD in a friends iMac. Did the job and cost pennies.

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @tomtastic @PablockMS

      I think the original sensor is supposed to be digital (PWM?). Firmware wouldn't be able to put out an analog value. I do know about the shorting trick, but I wonder how important it is to get real temperature for HDDs, to avoid overheating.

      3 replies 0 retweets 1 like
      Hector Martin‏ @marcan42 9 Jul 2020
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      Replying to @marcan42 @tomtastic @PablockMS

      This is for the 2015 iMacs with SATA HDDs, with temperature over the SATA power connector (HDD LED pin I hear?), not the older setup with the discrete connector.

      3:29 AM - 9 Jul 2020
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      • sww1235 Pablo
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