Bug 198563

Summary:	Two displayport monitors connected via hub flash black when typing
Product:	Drivers	Reporter:	John Hughes (john)
Component:	Video(Other)	Assignee:	drivers_video-other
Status:	RESOLVED PATCH_ALREADY_AVAILABLE
Severity:	normal
Priority:	P1
Hardware:	Intel
OS:	Linux
See Also:	https://bugs.debian.org/886746
Kernel Version:	4.9.65	Subsystem:
Regression:	Yes	Bisected commit-id:

Description John Hughes 2018-01-23 15:49:25 UTC

I have a system with one displayport and two monitors connected via a displayport hub.

All worked well with kernel 4.9.30, but when I upgraded to 4.9.65 the displays would often go black for a second or two.  This seems to happen when typing into a gnome-terminal window.

The problem was first seen with kernels from Debian stretch, but has been seen when using kernels compiled from vanilla.

This is Debian bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886746

I'm currently building a more recent kernel to see if the bug still exists and will try bisecting if it does.

Comment 1 John Hughes 2018-01-24 09:25:38 UTC

Well it seems that the bug is fixed in 4.9.77 so I'm not going to bother bisecting.

If anyone needs more information or testing please contact me by mail.