ASEM(8)

📦
version 2.8.5 · 14 versions
, in fedora 43, fedora 44

✨ ASEM(8) ✨

okay bestie, buckle up 💖 this is the manual page for asem, living in section 8 of the NUT Manual. It's giving very specific, very niche, very hardware girlie energy, and honestly? obsessed. 🎀

🌸 NAME 🌸

asem — the driver for the UPS inside an ASEM PB1300. That's it, that's the whole vibe. 💅

🦋 SYNOPSIS 🦋

asem -h

asem -a UPS_NAME [OPTIONS]
Note 📌 — This man page only spills the tea on the hardware-specific features of the asem driver. For everything about the core driver, go read nutupsdrv(8). Not optional, bestie, it's required reading. 🫶

💖 SUPPORTED HARDWARE 💖

The asem driver supports the UPS that lives inside ASEM PB1300 embedded PCs. And lowkey? Other I2C devices from the same manufacturer will probably work too, because this thing is a "custom" charger. Slay. ✨

So here's the lore: seems like there are two versions of the charger.

  • The older one is based on Max1667
  • The newer one is a custom solution

Both of them sit on I2C address 0x09. 🎯 To be compatible with both versions, the driver just reads bit 15 of address 0x13, which yields the online/on battery status. One bit. No drama. Iconic behaviour honestly. 👑

The battery monitor is a BQ2060 at address 0x0B. 🍓

🎀 EXTRA ARGUMENTS 🎀

The required parameter for this driver is the I2C bus name:

  • port=dev-node — On the Asem PB1300, this should be /dev/i2c-7 for the i801 SMBUS adapter. Don't skip this one, it's literally required. 🚨

This driver also supports the following optional settings:

  • lb=num — Set the low battery threshold to num volts. ⚡
  • hb=num — Set the high battery threshold to num volts. 🔋

🌈 INSTALLATION 🌈

This driver is specific to the Linux I2C API, and it needs the libi2c-dev library and headers from the lm_sensors project, or its equivalent, to compile. No shortcuts, bestie. 💅

⚠️ Beware ⚠️ — The SystemIO memory used by the I2C controller is reserved by ACPI. If only a native I2C driver is available (e.g. i2c_i801, as of 3.5.X Linux kernels), then you'll need to relax the ACPI resources check. For example, you can boot with the acpi_enforce_resources=lax option. Yes, fr fr, that's the move. 😭

💀 KNOWN ISSUES AND BUGS 💀

The driver shutdown function is not implemented, so other arrangements must be made to turn off the UPS. Not me leaving the UPS on because the driver said "no" 💀 — plan around it, bestie. 🙈

👑 AUTHOR 👑

Giuseppe Corbelli <giuseppe.corbelli@copanitalia.com> — king behaviour, thank you for your service 🫡💜

🌟 SEE ALSO 🌟

🧚 The core driver

🌐 Internet resources

and that's the whole page, bestie, no cap 💖 this was Network UPS Tools 2.8.5, dated 10/07/2026, and it's the ASEM(8) page — go forth and talk to your I2C bus, main character energy only ✨🎀🦋💅

📦 where this page comes from