On Thu, Oct 31, 2024 at 7:34 AM Anca Tibor Attila anca.tibor@posteo.de wrote:

Hello,

I searched a bit around, but didn't find anything similar (tried to find somethin in bugzilla...).

On my machine (Thinkpad E485), running Fedora 40 with all latest updates (Kernel 6.11.5-200.fc40.x86_64) usb ports stopped working. On boot my external Harddrive (connected through a hub) starts working, but when I reach the GNOME login screen, everything USB related device stops. The funny thing is, my phone still charges. But the hardrive disappears from the system, the usb-mouse isn't working (trackpoint does), lsusb gives a funny short list. I now booted the previous kernel, everything works fine.

Anyone else noticing this?

Not on the 3 systems (one Apple, 2 Dell) I upgraded. Try a power off restart. If that doesn't solve the issue, make sure you have current firmware updates from Lenovo. This is likely a power management issue -- there may be some UEFI as well as Gnome settings that affect USB devices -- e.g., turning off external devices to reduce power needs at inappropriate times. There have been many issues with wake from sleep where devices don't get power back up.

On 10/31/24 3:34 AM, Anca Tibor Attila wrote:

On my machine (Thinkpad E485), running Fedora 40 with all latest updates (Kernel 6.11.5-200.fc40.x86_64) usb ports stopped working. On boot my external Harddrive (connected through a hub) starts working, but when I reach the GNOME login screen, everything USB related device stops. The funny thing is, my phone still charges. But the hardrive disappears from the system, the usb-mouse isn't working (trackpoint does), lsusb gives a funny short list. I now booted the previous kernel, everything works fine.

Run "journalctl -b" and scroll down until you find the point where the USB devices go away. See what's happening at that point.

Tim:

...

I wonder if those are devices that just expect to get lots of power from the USB port without asking for it

Dr. Tibor Attila Anca:

I indeed have an external HDD on my USB hub, but that device has an own power supply. The USB-Mouse should not ask for that much power, right? Anyway, I did now a clean install of F41, no issues till now with losing USB.

True, a mouse shouldn't use much power (well, not unless it's one of those gaming mice with a built-in overdone lighting effects). But the default very low power that a USB port is supposed to supply until more is negotiated, is too low for many devices, even simple ones. Though my comment is taking one of those wildly unusual approaches (since USB power negotiation is so often ignored that it often doesn't matter).

However, the power consumption of USB devices is cumulative. You'll find that a set of ports will have a maximum power supply capability spread between all of them. So a plethora of plugged in things does tax a system badly.

I have two webcams that if both are plugged into the same group of ports does make my PC go haywire. It was a little experiment in streaming. They do identify themselves differently from each other, so I discount it being that kind of clash. They do consume a fair bit of power.

I've even found lots of low powered USB things plugged into a PC to cause issues. By the time you've got mouse, keyboard, webcam, harddrive, sound card, etc, plugged in, you may encounter a design weakness in a motherboard that makes things unstable. I can certainly upset my computer by plugging in two illuminated keyboards, that's otherwise fine with two plain keyboards at the same time.