USB-device not found after kernel upgrade
…just a random issue I once had

While upgrading to a newer kernel, I changed the kernel .config a bit and somehow managed to unset CONFIG_USB_OHCI_HCD_PCI (which actually meant setting it no CONFIG_USB_OHCI_HCD_PCI=n). The result was that when I plugged in a USB-stick, I could see it beeing recognized with dmesg and it was listed with lsusb but when I tried to mount it and looked up its device name with lsblk, I found nothing. Pretty confusing first :D So if you ever run into this kind of error you should maybe check that every kernel option needed is set no m or y first.

I was lucky to find this article in the gentoo forum :) Which helped me a lot to spot the perpetrator.

Well, that's all, folks :) Have more fun!