Hi!

I have a very strange problem with a recently purchased ViewSonic 4k display connected via display port to a Thinkpad 410 with nvidia gt218m (nvs 3100m).

Every time the mouse pointer touches the left edge of the screen, the display becomes a block of solid color and freezes. Suspend/resume of the laptop reanimates the display. I suspected a bug in the handling of the hardware cursor, so tried disabling that via HWcursor false in xorg.conf, to no avail. HWcursor false leads to black screens (internal and external).

There are no related messages in dmesg or in xserver-log.

versions: X server 1.17.2, linux kernel 4.5.0, nouveau 1.0.12, dual screens active (also happens with external monitor active only, though that configuration is very unstable), does not matter if the external monitor is configured as "left", "right" or "top" to the internal; did not try "bottom".

Any Idea how I could further investigate this problem?

As a workaround, i create a pointer barrier via xfixes, that works for now.

TIA
Robert
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