Jestem prawie pewien, że napotkałem ten problem po tym, jak program Acronis Backup & Restore 11.5 zobrazował mój dysk do pliku .tib.
Zarówno w systemie źródłowym, jak i docelowym najwyraźniej brakowało następnie C: \ windows \ inf \ usb.inf.
Skopiowałem go później z mojego netbooka, a później zaktualizowałem sterowniki, a moja bezprzewodowa klawiatura logitech k400 znów działała.
Wydaje się, że wpłynęło to nie tylko na odbiorniki ujednolicające logitech, ale także na wszystkie urządzenia kompozytowe USB. Dotyczy to również mojego tabletu z Androidem, a także odbiornika kontrolera USB Microsoft Xbox 360, ponieważ ma zsynchronizowane z nim dwa pady 360, ale nie dotyczy to mojego przewodowego PowerA Minix360. Nie dotyczy to również mojej przewodowej klawiatury Microsoft 600 i logitech V220, ponieważ nie są to „urządzenia kompozytowe USB”, ale „urządzenia USB Human Interface”.
Urządzenie kompozytowe USB służy do zawijania wielu urządzeń potomnych w jednym urządzeniu nadrzędnym, takich jak dwa punkty końcowe USB Human Interface Device (jeden dla klawiatury, drugi dla myszy), tak jak robi to Logitech Unifying Receiver.
Ogromne podziękowania dla lucvdv z answer.microsoft.com za znalezienie tego :
Some time ago, my system stopped recognizing some, but not all USB devices.
USB ports are fine, it reads the device descriptors but then either says
it's unknown hardware or says it can't find a driver for it.
A second symptom that must have started at the same time is that it
"forgets" all about some USB devices that have always worked fine before,
with the same result: suddenly either "unknown" or "can't find a driver".
Two weeks ago, it was my keyboard.
It still worked when I logged on (it had to, I used it to enter my password).
Immediately after logging on, the found new hardware thing popped up,
after a few seconds it said it failed to install my new hardware, and at
that moment my keyboard stopped working.
Never found a solution, I've been using a PS2 keyboard instead since.
I've tried other USB keyboards, it didn't recognize any of them.
Yesterday, it was the USB hub that's built into my monitor that
suddenly turned into an "unknown device", and nothing I connect
to it is detected anymore.
In an attempt to fix that, I launched the device manager and let it
scan for new hardware.
Result: instead of my USB hub starting to work again, my
Logitech wireless mouse stopped working.
The "USB receiver" is now listed with an exclamation mark,
"drivers for this device are not installed".
It worked fine just a few seconds before.
Right now I'm back to using a wired USB mouse, but I wonder how
long that's going to keep working.
It's not the receiver that's at fault: when I plug it in,
it shows up in device management with the right name and device ID:
USB\VID_046D&PID_C52B&REV_1201 - USB\VID_046D&PID_C52B,
and status "The drivers for this device are not installed. (Code 28)".
Comparing the contents of %SystemRoot%\Inf to another Win7-64 system,
I noticed that file USB.INF was missing.
Copied it over from the other system, started device manager and
re-installed drivers for the non-working devices, and the problem is fixed.
Dziękujemy za cierpliwość w śledzeniu go, lucvdv!
