Bug 96983

Summary:	Erratic mouse cursor with ghosting and artifacts on external monitor via dock (vga+hdmi)
Product:	DRI	Reporter:	frankshin82
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED FIXED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	frankshin82, intel-gfx-bugs, rvspeter
Version:	DRI git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:	SKL	i915 features:	display/USB-C

Description frankshin82 2016-07-19 00:15:04 UTC

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.

Comment 1 yann 2016-07-19 14:15:33 UTC

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?

Comment 2 frankshin82 2016-07-19 20:49:25 UTC

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

Comment 3 Peter 2016-08-16 10:14:21 UTC

I'm getting this issue too now that I'm running 4.8.0-rc1 kernel.

dmesg: http://ix.io/1eKo

Comment 4 Peter 2016-08-23 13:21:13 UTC

A further note - I'm not using a dock, just a simple USB-C to DisplayPort adaptor.

Comment 5 dog 2016-11-17 19:20:27 UTC

Which USB-C to DP dongle are you using?  We've seen various issues with these dongles depending on the vendor.

Comment 6 Ricardo 2017-02-22 16:55:04 UTC

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

Comment 7 Jari Tahvanainen 2017-04-10 11:19:22 UTC

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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