Bug 56041 - Disabling LCD on ARUBA causes hotplug loop
Summary: Disabling LCD on ARUBA causes hotplug loop
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-04-01 01:04 UTC by Thomas J. Moore
Modified: 2013-04-12 03:43 UTC (History)
1 user (show)

See Also:
Kernel Version:
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Possible fix (1.45 KB, patch)
2013-04-11 16:47 UTC, Alex Deucher 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

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.
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