Re: `ucsi_acpi: probe of USBC000:00 failed with error -12` on Dell XPS 13 9370

From: Paul Menzel
Date: Tue May 15 2018 - 13:41:36 EST

Dear Greg,

As always, thank you for the prompt response.

On 05/15/18 18:00, Greg KH wrote:
On Tue, May 15, 2018 at 04:34:03PM +0200, Paul Menzel wrote:

Linux 4.17-rc5 shows the error below on the Dell XPS 13 9370 with Debian

[ 0.440240] usb: port power management may be unreliable
[ 0.441358] usbcore: registered new interface driver usb-storage
[ 0.441367] usbcore: registered new interface driver usbserial_generic
[ 0.441369] usbserial: USB Serial support registered for generic
[ 0.441383] ioremap error for 0x3f799000-0x3f79a000, requested 0x2, got
[ 0.441518] ucsi_acpi: probe of USBC000:00 failed with error -12

1. Are the ioremap and ucsi_acpi error related or is a separate report

The ioremap error is what causes ucsi_acpi to fail the probe call (-12
is "out of memory".)

2. Do you know the reason for the ucsi_acpi error?

the call to ioremap failed.

Does this device really have a working typec connector?

Just to avoid misunderstandings, no device was connected to the laptop during my test.

But, from other boots, the Dell docking station TB16 kind of works with it, so Iâd say the USB Type-C connector is working.

Does normal USB devices work with it?

Sorry for being ignorant, but could you please tell me what normal USB devices are?

Kind regards,


Attachment: smime.p7s
Description: S/MIME Cryptographic Signature