Bug 1327932

Summary: Dual monitor system boots with only one monitor active with Kernel 4.4.x
Product: [Fedora] Fedora Reporter: Paul Loewenstein <paul.loewenstein>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 23CC: gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab, paul.loewenstein
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: 4.5.6 (or possibly earlier) Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-06-14 11:00:05 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:
Attachments:
Description Flags
Output of journalctl -b > boot-4.4.6.txt none

Description Paul Loewenstein 2016-04-18 04:07:05 UTC 
Description of problem:

Intel Core-Duo CPU E8400 with Intel Q45/Q43 graphics and dual monitors comes up with just a single monitor with kernel 4.4.6 (and all other 4.4.x I've tested)

Version-Release number of selected component (if applicable):

4.4.6 and earlier 4.4.x

How reproducible:

100%

Steps to Reproduce:
1.  Boot graphical system with both monitors attached and switched on.

Actual results:

Comes up with only one monitor active

Expected results:

Come up with both monitors active.

Additional info:

Booting with kernel 4.3.5 on an otherwise up-to-date system comes up with both monitors active.  Hence I've filed this against the kernel.

I have performed a manual compare of the journals of the 4.3.5 boot and 4.4.x (at least 2 generations earlier than 4.4.6) and saw no obvious smoking gun.

Only one monitor shows building of the Fedora logo, so the issue must be at quite a low level.  With kernel 4.3.5, this shows on both monitors.
Comment 1 Paul Loewenstein 2016-04-18 04:26:50 UTC 
Created attachment 1148104 [details]
Output of journalctl -b > boot-4.4.6.txt
Comment 2 Paul Loewenstein 2016-04-29 05:30:17 UTC 
Same problem on kernel 4.4.8.
Comment 3 Paul Loewenstein 2016-06-14 05:38:57 UTC 
Seems to be fixed in kernel 4.5.6.
I would close this bug, but I can't find a suitable status description.  "FIXED" does not appear to be a choice open to me!
Comment 4 Josh Boyer 2016-06-14 11:00:05 UTC 
Thank you.