Bug 56041

Summary:	Disabling LCD on ARUBA causes hotplug loop
Product:	Drivers	Reporter:	Thomas J. Moore (darktjm)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	normal	CC:	alexdeucher
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Possible fix

Description Thomas J. Moore 2013-04-01 01:04:06 UTC

My hardware:  a Gateway/Acer laptop with Radeon HD 7640G.  Disabling the LCD (xrandr --output eDP --off) while the external display is being used causes some sort of hotplug event loop.  100% of one CPU's worth of CPU time is consumed, and X freezes every few seconds.  For now, I have worked around by commenting out "queue_hotplug = true" in evergreen.c (case 0).

Comment 1 Alex Deucher 2013-04-11 16:47:24 UTC

Created attachment 98191 [details]
Possible fix

Does the attached kernel patch help?

Comment 2 Alex Deucher 2013-04-11 16:48:10 UTC

Make sure you power off your system completely before testing to make sure there are no residual register values.

Comment 3 Thomas J. Moore 2013-04-12 03:43:14 UTC

Yes, that seems to have fixed it.  Thanks.