Around mid June 2016 compile of the linux drm intel nightly branch kernel the mouse cursor has erratic behavior. The issue starts happening between commits from 2016-06-13 and 2016-06-21. I have a dell xps 13 9350 connected via usb-c to a dock (dell WD15) which has two external monitors connected to the dock via hdmi and vga port. The mouse, when moving from one external monitor to the other creates a ghost trail of cursors. The cursor jumps around erractically on display but the actual cursor is somewhere else. Please ask which details I can provide as there is nothing showing in dmesg. I've tried with two different mouse (logitech g700 and razer mamba). This issue does not happen in mainline branch kernel.
can you add drm.bebug=0xe on your boot command line and re-replay failure, then attached dmesg? Moreover, while going through your dock, can you try to connect only one display and see if it is happening on either vga or hdmi?
Dmesg on today's compile. Booted with dock (wd15). Upon entering X, move mouse around to trigger bug. Artifacts shown when hovering gtk popup dialogs. Ghosting/trailing when launching firefox and moving cursor http://ix.io/15tq
I'm getting this issue too now that I'm running 4.8.0-rc1 kernel. dmesg: http://ix.io/1eKo
A further note - I'm not using a dock, just a simple USB-C to DisplayPort adaptor.
Which USB-C to DP dongle are you using? We've seen various issues with these dongles depending on the vendor.
Hi is this issue still occurring with latest kernel? can you please retest and if the problem still exist update logs attaching dmesg first adding drm.bebug=0xe on your boot command line and re-replay failure if the problem still occurs set the bug to reopen if the problem is gone set the bug to resolved if there is no activity within 30 days the bug will be closed
Timeout - assuming resolved+fixed. If problem still persists with the latest kernels (preferable drm-tip from git://anongit.freedesktop.org/git/drm-tip), please reopen this with the latest data as attachments (see https://01.org/linuxgraphics/documentation/how-report-bugs). See also comment 5.
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