Seems like intel_vbtn didn't recognize the switch in the initial setup
code. When switch disconnect event occurred, the code ran into the
following block:

if (!priv->has_switches) {                                                      
                                        
    /* See dual_accel_detect.h for more info */                                 
                                    
    if (priv->dual_accel)                                                       
                                    
        return;                                                                 
                                
                                                                                
                                                       
    dev_info(&device->dev, "Registering Intel Virtual Switches input-dev after 
receiving a switch event\n");        
    ret = input_register_device(priv->switches_dev);                            
                                    
    if (ret)                                                                    
                                    
        return;
    priv->has_switches = true;                                                  
                                    
}

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https://bugs.launchpad.net/bugs/2073001

Title:
  Regression: kernel bug upon keyboard disconnect

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