Bug 135561

Summary: Surface Pro 4 type cover not working after unplug/replug
Product: Drivers Reporter: Weng Xuetian (wengxt)
Component: Input DevicesAssignee: drivers_input-devices
Status: NEW ---    
Severity: normal CC: benjamin.tissoires, dmitry.torokhov, rui.zhang, szg00000, yuzvir
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 4.6.0 Subsystem:
Regression: No Bisected commit-id:
Attachments: patch that adds type cover 4 support.

Description Weng Xuetian 2016-07-19 17:25:44 UTC 
Created attachment 224291 [details]
patch that adds type cover 4 support.

This only happens to me after a specific firmware update from Microsoft. (7/14 updates). https://www.microsoft.com/surface/en-us/support/install-update-activate/surface-pro-4-update-history

When I boot the surface with type cover 4 plugged in and boot into linux, the type cover will work properly (kernel is with a patch applied to add device id, patch can be found in attachment).

But if I either suspend and resume the Surface, or unplug the type cover and replug it again, the type cover 4 will stop working. Type cover can still be recognized by kernel (checked by lsusb/dmesg). But it doesn't work and the led light on type cover also not light up and doesn't work under either tty or X11.
Comment 1 Weng Xuetian 2016-09-20 22:02:02 UTC 
ping :)
Comment 2 Dmitry Torokhov 2016-11-04 22:38:17 UTC 
Weng, please send your patch directly to Jiri Kosina <jkosina@suse.cz> (who is maintainer of HID drivers) and CC Benjamin Tissoires <benjamin.tissoires@redhat.com> and linux-input@vger.kernel.org mailing list.

You can also discuss there the issues you are seeing with the cover after suspend/resume.

Thanks!