Ancestors

Written by Ruud van Asseldonk on 2024-08-06 at 20:28

The wifi on my laptop is really slow since the past few days. The problem is with this machine because my work laptop is fine. The dmesg is full of messages from iwlwifi about stuck queues and microcode SW errors. Could it be the 6.10.1 → 6.10.2 kernel update I did last weekend? Let’s pull those tags and look at the Git log if there was a change related to iwlwifi. But, how to pull with bad wifi?

Receiving objects: 0% (5792/1829986), 3.40 MiB | 2.00 KiB/s

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Toot

Written by Ruud van Asseldonk on 2024-08-06 at 20:40

Hmm, downgrade did not fix it. None of the other updated packages look suspicious. Is it a hardware problem then?

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Descendants

Written by Ruud van Asseldonk on 2024-08-06 at 20:47

(Running speed.cloudflare.com in the background, it didn’t even get to the packet loss part.)

What else changed since last weekend? I plugged in this Samsung T9 external SSD into one of the USB-C ports. Let me try to unmount and unplug it.

• unplugs*

• speedtest in the background shoots up to full speed, breezes through the packet loss part at 0% loss*

Suddenly wifi works normally again.

WAT?!

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Written by RMerlin on 2024-08-06 at 20:41

@ruuda Try with a distro from a bootable USB drive to rule out OS issues.

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Written by RMerlin on 2024-08-06 at 20:58

@ruuda Make sure you aren't connected over 2.4 GHz wifi. USB 3 transfers can generate radio interterence in the 2.4 GHz band if the device and its cable aren't properly shielded.

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Written by Ruud van Asseldonk on 2024-08-06 at 21:20

@RMerlin Sure but interference alone shouldn’t make the wifi driver print “Microcode SW error detected. Restarting 0x0” right?

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Written by RMerlin on 2024-08-06 at 21:21

@ruuda You're probably right. It should just cause disconnections and packet losses. And the issue would only happen on the 2.4 GHz band, 5 GHz band would be fine.

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