Description of problem:

After recent updates, the cursor intermittently resets to a default position on the screen and the on-screen keyboard appears. This occurs whether input is controlled through the trackpad or a mouse. The following dmesg warning appears to be related to this issue:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun

This is occurring on a Google Chromebook Pixel (2015), which includes a touchscreen interface. The touchscreen only partially works at this point, so I cannot fully replicate the issue using the touchscreen as the input.

Version-Release number of selected component (if applicable):

Fedora 23 (Beta), latest packages as 2015-10-10
Kernel 4.2.3-300.fc23.x86_64

How reproducible:


Steps to Reproduce:
1. Boot Fedora 23 (Beta).
2. Move mouse around screen.
3. Observe mouse resetting and on-screen keyboard appearing.

Actual results:
Cursor skips across the screen and resets to the upper-left corner of the screen. On-screen keyboard appears until the mouse/trackpad becomes responsive and the system detects that mouse/trackpad input is occurring (thus removing the need for the on-screen keyboard).

Expected results:
Cursor remains where it is directed and on-screen keyboard does not appear.

Additional info:
After several minutes, the following message also appears in dmesg:

chrome[3120]: segfault at 40 ip 000055f838f63dd6 sp 00007ffc85b478c0 error 4 in chrome[55f837a23000+5767000]

After this happens, the cursor becomes more responsive and does not reset as often. The on-screen keyboard no longer appears, but the cursor skipping around the screen and resetting does continue.