hermes-config/skills/devops/cockpit-custom-packages/references/cpu-temp-data-format.md

CPU Temperature Data Format (from nvidia-gpu-monitor)

The monitor script has been extended to write CPU temperatures alongside GPU data.

cpu.txt (added by cockpit-custom-packages SKILL.md user session)

Written by the same systemd service (nvidia-gpu-monitor) that writes GPU data, every 5 seconds.

48,43,46

Comma-separated integers (no spaces):

Index	Sensor	Source	Notes
0	CPU Package	/sys/class/thermal/thermal_zone3/temp	Main CPU temp, integer °C
1	PCH	/sys/class/thermal/thermal_zone2/temp	Platform Controller Hub temp
2	ACPI	/sys/class/thermal/thermal_zone0/temp	ACPI zone temp

Parsing: data.trim().split(',') gives a 3-element array. Check s.length >= 3 before accessing.

Reading from shell: cat /sys/class/thermal/thermal_zone3/temp returns millidegrees (e.g. 48000 = 48°C). Divide by 1000 for °C.

Adding to the monitor script

Insert this block before the sleep 5 in the monitor loop:

# CPU temps
pkg=$(cat /sys/class/thermal/thermal_zone3/temp 2>/dev/null || echo 0)
pch=$(cat /sys/class/thermal/thermal_zone2/temp 2>/dev/null || echo 0)
acpi=$(cat /sys/class/thermal/thermal_zone0/temp 2>/dev/null || echo 0)
echo "$((pkg/1000)),$((pch/1000)),$((acpi/1000))" > /usr/share/cockpit/nvidia-gpu/cpu.txt

Adding a CPU Card to the Dashboard

Use the accent-cyan color class to distinguish from GPU cards:

.card.accent-cyan{border-top:3px solid #06b6d4}

HTML pattern (compact, big-temp + mini stats):

<div class="card accent-cyan"><h2>🔥 CPU</h2>
  <div class="temp-group">
    <div class="temp-big"><span class="temp-cold" id="cpu-temp">--</span><span class="unit">°C</span></div>
    <div class="temp-mini">
      <div class="temp-mini-item"><span>PCH</span><span class="val" id="pch-temp">-</span></div>
      <div class="temp-mini-item"><span>ACPI</span><span class="val" id="acpi-temp">-</span></div>
    </div>
  </div>
  <div class="bar-track"><div class="bar-fill temp" id="cpu-bar" style="width:0%"></div></div>
  <div class="bar-labels"><span>0°</span><span>50°</span><span>75°</span><span>100°</span></div>
</div>

JS to populate (inserted before the CUDA read):

cockpit.spawn(["cat",PKG+"/cpu.txt"],{err:"message"}).done(function(d){
  if(d&&d.trim()){var s=d.trim().split(',');if(s.length>=3){
    var cp=parseInt(s[0]);$('cpu-temp').textContent=isNaN(cp)?'--':cp;
    $('pch-temp').textContent=s[1]+'°';$('acpi-temp').textContent=s[2]+'°';
    var tp=Math.min(100,Math.max(0,cp));$('cpu-bar').style.width=tp+'%';
    var tc='temp-cold';if(cp>=50)tc='temp-mild';if(cp>=65)tc='temp-warm';if(cp>=80)tc='temp-hot';
    $('cpu-temp').className=tc;
  }}
});

Also add the 7th animation delay entry:

.grid>*:nth-child(7){animation-delay:0.24s}

Sensor Availability

Not all systems have all three thermal zones. The script uses || echo 0 fallback. Common zone mappings:

Zone index	Typical sensor	Common on
0	ACPI	All x86_64
1	ACPI (secondary)	Laptops, multi-zone
2	PCH	Intel Comet Lake+
3	x86_pkg_temp	All modern CPUs