VIAENV(4)

💖 NAME 💖

okay so bestie, say hi to viaenv(4) from the Kernel Interfaces Manual — it's the VIA VT82C686A/VT8231 Hardware Monitor and Power Management Timer. 💅 she's giving hardware-watch main character energy, no cap.

🌸 SYNOPSIS 🌸

the whole attach vibe is literally:

viaenv* at pci? dev ? function ?

that's the synopsis, and yes it's short and iconic. ✨

💅 DESCRIPTION 💅

viaenv is an envsys(4) compatible driver for the Hardware Monitor and the Power Management timer in the VIA VT82C686A and VT8231 South Bridges. 🎀

the device has 10 sensors — here's the full roster with units and typical use, because we do not skip details in this group chat:

• TSENS1 — uK — CPU temperature
• TSENS2 — uK — System temperature
• TSENS3 — uK — ? (yes, literally ?, the manual is being mysterious 🙈)
• FAN1 — RPM — CPU fan
• FAN2 — RPM — System fan
• VSENS1 — uV DC — CPU core voltage (2.0V)
• VSENS2 — uV DC — North Bridge core voltage (2.5V)
• Vcore — uV DC — Internal core voltage (3.3V)
• VSENS3 — uV DC — +5V
• VSENS4 — uV DC — +12V

sensor data is updated every 1.5 seconds. fresh lil numbers on a timer, slay. ⏱️

🎀 SEE ALSO 🎀

go read envsys(4) and envstat(8) — the supporting cast, and they ate. 👑

🦋 HISTORY 🦋

the viaenv device appeared in NetBSD 1.5. vintage icon behavior, lowkey. 🌈

💀 BUGS 💀

bestie, real talk: interrupt support is unimplemented, and support for setting values is unimplemented too. fr fr, don't go looking for those features. 😭

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mwah 💋 this page is from Debian, dated January 20, 2007, and the footer badge is VIAENV(4). 🫶✨