I've found a possible workaround that seems to be working at the moment.Running from command line produces these errors whenever the login window appears:KMS: DRM_IOCTL_MODE_CREATE_DUMB failed: Permission deniedFailed to create GBM buffer of size 100...

This has just happened to me with 4.10.07061 on Ubuntu linux.  VPN worked a day or two ago, I rebooted the system this morning to an updated kernel and I now get a blank login window.  I'm unclear what an accepted solution of clearing browser cache h...