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Blur is not an option in Zoom program - because it thinks the CPU speed is 0 GHz?

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The Zoom program on one PC here does not have the option to blur the background in video calls. It offers three backgrounds (Golden Gate bridge, grass, sunrise over Earth) but none of them work when selected. Everything else I have tried in Zoom works on it and it will do calls fine.

All use Zoom version 7.1.0 (3715) on Linux. One is running Ubuntu MATE 24.06, the other three Linux Mint, based on Ubuntu 24.06, including the one that doesn’t work.

If I look at the settings / statistics page, something is odd with the CPU info…

Intel i3 PC, 4 cores, 3.6 GHz. Works.
Intel i3 PC, 2 cores, 2.0 GHz. Works.
Ryzen 5 PC, 6 cores, 3.6 GHz. Works
Ryzen 3 PC, 4 cores. 0 GHz. This is the one that doesn’t!

Why would it show a 0 GHz CPU speed? How is it working out the CPU speed?

Is this why the backgrounds don’t work / blur is not offered, because Zoom doesn’t think there’s enough CPU power to do it? (For everything else, it’s seen as a much faster PC than the two core i3 one.)

J

JitsiAuthor

New Member

Same behaviour with the version that Zoom’s just been updated to: 7.1.5 (4332).

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Y

yong_liu

Employee

@Jitsi Could you please provide more detailed information about the computer model and its specifications?

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yong_liu

Employee

Copy the shell command below and run it in your terminal to retrieve CPU information.

printf '== CPU ==\n'; lscpu | grep -E 'Model name:|CPU\(s\):|CPU max MHz:|CPU min MHz:|CPU MHz:'; printf '\n== /proc/cpuinfo MHz ==\n'; awk -F: '/^cpu MHz/ {gsub(/ /, "", $2); print $2 " MHz"; exit}' /proc/cpuinfo; printf '\n== CPUFreq ==\n'; for f in scaling_driver scaling_cur_freq cpuinfo_max_freq; do printf '%s: ' "$f"; cat "/sys/devices/system/cpu/cpu0/cpufreq/$f" 2>/dev/null || echo '<unavailable>'; done

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J

JitsiAuthor

New Member

Thanks. Here’s the result:

== CPU ==
CPU(s):                                  8
Model name:                              AMD Ryzen 3 3100 4-Core Processor
CPU max MHz:                             3905.8831
CPU min MHz:                             564.7060
NUMA node0 CPU(s):                       0-7

== /proc/cpuinfo MHz ==
3725.005 MHz

== CPUFreq ==
scaling_driver: amd-pstate-epp
scaling_cur_freq: 3729466
cpuinfo_max_freq: 3905883

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Y

yong_liu

Employee

@Jitsi Thank you for your feedback! We have successfully reproduced the issue and it will be fixed in the next release, currently scheduled for late September.

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J

JitsiAuthor

New Member

Wonderful!

Can you say why it affected this one and not the others?

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J

JitsiAuthor

New Member

If I look at the settings / statistics screen, it gets its usage and overall CPU usage right (or at least, it shows the same info as ‘top’ does!)

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J

JitsiAuthor

New Member

Doing a ‘once every three or four months’ boot into Windows on the same machine shows it gets the frequency right then, and I can blur too.

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D

David Warner

Newcomer

Zoom may be misdetecting the Ryzen 3's CPU speed as 0 GHz, which could cause it to disable blur and virtual backgrounds. Check the CPU frequency with cpupower frequency-info and make sure the system is reporting it correctly. If Linux reports the correct speed, it’s likely a Zoom Linux detection/compatibility bug rather than a lack of CPU power.

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C

Carter Gray

Newcomer

The 0 GHz reading is definitely suspicious and could explain why Zoom disables background effects. I'd compare the CPU info (lscpu) with a working system and make sure the CPU frequency driver is working. If Linux reports the CPU correctly, it's likely a Zoom detection bug.

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