XU4Q idle temperatures

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HisDudeness
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XU4Q idle temperatures

Post by HisDudeness »

Hi everyone! I've got an XU4 and an XU4Q, on which I've tried the same system (ArchLinuxARM). While idling, the fan on the XU4 turns on seldom and for short periods of time, so everything seems to be ok. However, the tall heatsink on the XU4Q gets soon enough hot I can't touch it, with thermal_zone0 claiming around 69°C, all while leaving the board turned on and not doing anything. Is this normal? I was thinking about buying and adapting a Noctua NF-A4x20, but I wanted to get an idea if there's by any mean something wrong with my board before.
Last edited by HisDudeness on Fri Jun 19, 2020 4:42 pm, edited 1 time in total.
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Re: XU4Q idle temperatures

Post by odroid »

What is the default CPU governor in your ArchLinux configuration?
Also check "htop" output to find any hidden CPU loads.

As far as I remember, XU4Q idle CPU temperature should be near 50°C with ondemand governor.
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HisDudeness (Fri Jun 19, 2020 4:45 pm)

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Re: XU4Q idle temperatures

Post by HisDudeness »

htop reported all cores' load to be around 0%, but I don't know anything about the CPU governor, I'll check it out.
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Re: XU4Q idle temperatures

Post by odroid »

Try this command

Code: Select all

root@odroid:~# cat /sys/devices/system/cpu/cpu4/cpufreq/scaling_governor
ondemand
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HisDudeness (Fri Jun 19, 2020 4:45 pm)

HisDudeness
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Re: XU4Q idle temperatures

Post by HisDudeness »

The governor is defaulted to performance. That should be the culprit. I'm leaving it idling for a while without the case to see how much it contributes, then I'll switch to ondemand and hopefully confirm it stays around 50°C.

Noob question: why choose ondemand instead of conservative? Will the latter kind of lag high load requests by gradually increasing the voltage?
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Re: XU4Q idle temperatures

Post by odroid »

All of ondemand, interactive, conservative and powersave governors are doing the DVFS(Dynamic Voltage Frequency Scaling) controlling job well.
But the frequency swing characteristics against the CPU loads could be different as far as I know.
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HisDudeness (Sat Jun 20, 2020 5:42 pm)

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Re: XU4Q idle temperatures

Post by HisDudeness »

Without the case it went up more slowly and capped at around 65°C. Obviously, being enclosed in tight plastic does not help dissipate the heat, but the main problem is the CPU voltage. I don't know if all the difference is in those 4°C, but before I couldn't touch the heatsink at all, I would burn my finger in a tiny fraction of a second while this time it felt hot to the touch, but still bearable. I have to say, the first time I checked zone0, while this time I watched all five and kept the highest one.

I've now set conservative as governor and the frequencies are obviously lower (200MHz on policy0 and 300MHz on policy4). Temperatures are staying at around 48°C without case and 55°C with, so I'd say we can be confident that was the issue. Thank you very much for your help!
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odroid (Mon Jun 22, 2020 10:42 am)
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