Em Wed, 4 Apr 2018 16:26:22 +0300
Jaak Ristioja <j...@ristioja.ee> escreveu:

> Hello, all!
> I experience the same issue with a Lenovo ThinkPad T440p (LENOVO
> 20AN006VMS/20AN006VMS, BIOS GLET90WW (2.44 ) 09/13/2017). I tried to
> bisect v4.15..v4.16 but failed.

Could you post the complete dmesg? I also need the .config used
to build the Kernel.

From its call trace:

[   43.177492] Call Trace:
[   43.177498]  ? devres_add+0x5f/0x70
[   43.177502]  rmi_f54_probe+0x437/0x470 [rmi_core]
[   43.177505]  rmi_function_probe+0x25/0x30 [rmi_core]
[   43.177507]  driver_probe_device+0x310/0x480

It looks that this was generated by an input driver 
drivers/input/rmi4/rmi_f54.c, with could be doing something wrong when
registering at the media core.

From the logs, the warn on is happening at 
drivers/media/v4l2-core/v4l2-dev.c:945, e. g:

        /* Should not happen since we thought this minor was free */
        WARN_ON(video_device[vdev->minor] != NULL);

That was probably called here:

        drivers/input/rmi4/rmi_f54.c:   ret = video_register_device(&f54->vdev, 


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