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Temelj

Phone no longer wants to connect to a PC (Windows 10) via USB.

Windows Device Manager shows the phone as "Unknown USB Device (Device descriptor request failed)" and the phone does not provide an option to select - charging only, usb file transfer or that third option (MTP).

The Phone does appear to charge via PC USB & normal wall socket genuine charger.

Also, as the battery icon changes to charging - a solid orange led is lit while doing so. But I'm not longer receiving the notification on whether I want to connect my device in File Transfer mode.

Phone has the Android 7.0 update - 32.3.A.0.372

Any help/advice?

PS: Xperia Companion does not detect the phone and cannot be used for a software repair.

UPDATE:
Thanks NeoBeum for the proposed patches to my particular issue.

In summary:

Disable "USB selective suspend setting" under "Control Panel\Hardware and Sound\Power Options\Edit Plan Settings" in the Advanced Settings.
Uncheck "Allow the computer to turn off this device to save power" option in Device Manager for the "Universal Serial Bus controllers".

I can confirm that in my case the Xperia Z5 connects to the PC, charges from it and displays the popup "Use USB to - charge, transfer or MIDI". I can also confirm that I can debug applications from Visual Studio directly on the device.

However, I do not accept this as a solution as the windows related power settings should not affect the performance and connectivity of the Xperia Z5. These problems do not persist on other tested platforms/devices (Google Pixel, Samsung S5, Apple iPhone) connecting to the exact same computer.

I will try another Xperia Z5 Compact device to try replicate these issues.

Lasch

Hello again and thanks for all your work!
I've changed the USB power settings. All the drivers are present. That didn't fix the problem.
I plugged the phone to 5 different computers and it behaves the same way: a bing in the phone and then nothing more. No charging. The computers doesn't recognize that somthing just was plugged in.
So far the only way to come around the poblem I have seen is to do as described in message no 3, clean the USB storage before plugging in to the computer. Every time. (In fact, disabling the installation of Xperia Companion makes that this does not work.)
So I guess that MS might be innocent. This time.
I suspect that some app I have installed messes things up with USB settings and causes the malfunction. Is there a way to check that out other than uninstall everything and start from scratch? Beeing a newbie on Android I don't know ho to do things...
I mostly use a Dell laptop, about 4 years old. I have tried to post this a few times without success, now I try without image of sysinfo.

NeoBeum

Yeah, that is why I said the usb configuration is wrong, ADB should not appear

NeoBeum

It might actually be a fault hardware related, because adb is used when flashing, or other firmware setup for the phone . Not just for a normal mtp

NeoBeum

@lasch
Is USB Debugging OFF in Developers options?

NeoBeum

@Lasch wrote:

Boot the phone in to safe mode, Hold Power, then long press Power Off

The next thing I want to try is loading the adb drivers correctly - just incase it's something to do with that...

As I was saying above, ADB should only appear when you are doing something with the phone for Firmware or some other Power User type thing, and not as a general MTP everyday connection,

Here is the example on my PC:

This is with USB Debugging on - You can even see I haven't renamed the USB Composite Device

http://i.imgur.com/vnKo6fB.png

http://i.imgur.com/u68ptPy.png

Here it is off

http://i.imgur.com/b1ZLRWY.png

Lasch

Hello NeoBeum!
Two screenshots of device manager (after that cleaning procedure and restarting so the phone can connect), both without "show hidden objects", both with USB debugging on, the first one in normal mode

and the second one in safe mode (yes, I had to clear the USB storage to connect even in safe mode):

When I connect in safe mode and get the question about charging, MTP and so on, and choose MTP, the phone seems to disconnect - the charging LED on the phone goes out and there is a "disconnect sound" from the PC and the phone is no longer visible in device manager.

But after reboot (after the USB cleaning procedure) in normal mode, no USB debugging, this is the screenshot: