Bug 1173963

Summary:	F21 detects "unknown screen", broken display, on Intel video
Product:	[Fedora] Fedora	Reporter:	tonydiep
Component:	screen	Assignee:	Petr Hracek <phracek>
Status:	CLOSED WORKSFORME	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	21	CC:	lnykryn, phracek
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-12-15 18:16:49 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description tonydiep 2014-12-14 13:53:01 UTC

Description of problem:
* On a Gateway NV5911h laptop, Fedora 21 detects an "unknown display"
* When moving the mouse, the pointer leaves a trail
* The display flickers constantly
* The display behaves as if it is trying to show two desktops on the same screen at the same time
* If the laptop is _NOT_ connected to an external monitor, the "unknown display" cannot be disabled
* If the laptop _IS_ connected to an external monitor, the "unknown display" can be disabled and the issue is fixed

Version-Release number of selected component (if applicable):
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 540M] (rev a1)

How reproducible:
Always


Steps to Reproduce:
1. Turn on laptop and log in
Result: The screen will garbled
2. Do not use external monitor; use only the laptop screen
3. Go to "All Settings" -> Displays -> "Unknown Display" -> "Turn Off Don't use this display"
Result: Fedora cannot turn off the display


Actual results:
* Screen flickers, mouse leaves trails, windows leave traces, when resizing,

Expected results:
* Normal screen display

Additional info:
* Issue cropped up only in Fedora 21

Comment 1 tonydiep 2014-12-15 18:16:49 UTC

Workaround found:

1. This laptop uses dual switchable Intel/nvidia graphics; I set the graphics to Intel only

2. I manually created a xorg.conf entry for "Unknown Monitor"

Section "Monitor"
Identifier "Unknown Display"
Option "ignore" "true"
...

Workaround found; Issue closed.