Kernel Panic when booting with two DELL U2414H monitors connected via DisplayPort

Originator:m4ttcheetham
Number:rdar://23026822 Date Originated:08-Oct-2015 09:45 AM
Status:Duplicate of 21589200 (Closed) Resolved:
Product:OS X Product Version:10.11 (15A284)
Classification:Serious Bug Reproducible:Always
 
Summary:
Attempts to boot mac whilst having two DELL U2414H monitors connected results in kernel panic half way through boot repeatedly. Unplugging displays until mac has booted resolves the issue

Steps to Reproduce:
1. Connect two DELL U2414H displays. One in each DisplayPort on a MacBook Pro (Retina, 15-inch, Mid 2014)
2. Attempt to power up mac
3. Observe Apple Logo with loading indicator
4. See Kernel panic and reboot

Expected Results:
Mac should boot

Actual Results:
Kernel panic is displayed and mac restarts.
The only way to resolve is by unplugging both displays and waiting until the mac has booted to re-attatch.

Regression:
Does not occur when no displays are connected

Notes:
I found a discussion on the same issue here. https://discussions.apple.com/thread/6988690?start=30&tstart=0

Comments

Apple Developer Relations

Engineering has determined that your bug report is a duplicate of another issue and will be closed.

The open or closed status of the original bug report your issue was duplicated to appears in the yellow "Duplicate of XXXXXXXX" section of the bug reporter user interface. This section appears near the top of the right column's bug detail view just under the bug number, title, state, product and rank.

If you have any questions or concerns, please update your report directly here: http://bugreport.apple.com/.

By m4ttcheetham at Oct. 24, 2015, 8:05 a.m. (reply...)

Sent files

As the issue occurs at boot I am unable to run the diagnostics as it happens. I have run the diagnostics after booting my macbook when the issue occured.

'MacBook Pro.spx' and 'sysdiagnose_2015.10.09_09-55-55+0100_315.tar.gz' were successfully uploaded.

By m4ttcheetham at Oct. 9, 2015, 9 a.m. (reply...)

Apple Developer Relations

Please attach the output of 'sysdiagnose' collected while the problem is occurring or if not possible taken after the issue has occurred. 'sysdiagnose' can be triggered by pressing Cmd-Opt-Ctrl-Shift-Period or in Terminal using 'sudo sysdiagnose', and it may take a few minutes to complete. When ready, the output will automatically be revealed in a Finder window (or it can be manually retrieved from /var/tmp). Please note that you may need to zip the file if you are having any issues uploading to the bug reporting website.

Also, please attach a full System Information Report of the configuration this is reported on.

To obtain a full System Information Report (also known as ASP, system profile, spx, system configuration):

  1. Select "About This Mac" from the Apple Menu
  2. Click the “System Report” button on the About This Mac window
  3. Select "Save…" from the File menu (cmd-s)
  4. Change the file name and save location as needed
  5. Click the "Save" button

This report can also be obtained in Terminal using the following command:

/usr/sbin/system_profiler -detailLevel full -xml > ~/Desktop/mymachine.spx

Please attach the files to your bug report.

By m4ttcheetham at Oct. 9, 2015, 9 a.m. (reply...)

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