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Old 12-11-2013, 06:17 PM   #1
Registered: Jun 2012
Posts: 258

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My 30" monitor stopped working after upgrading to CentOS 6.5

I upgraded from CentOS 6.4 to CentOS 6.5 and when I rebooted the first time after the upgrade, my big 30" monitor went black just as it was about to display the login prompt. I have a monitor configuration consisting a 30" 2560x1600 onitor sitting between two 1920x1200 monitors in portrait mode sitting on each side of it.

The side monitors continued to function after the upgrade, but of course I lost a big piece of my real estate with the loss of the 30" monitor. I rebooted and selected my previous system kernel and everything came up fine.

I haven't had a chance to dig too deeply into what caused the problem. My question is whether or not this is a known issue with kernel-2.6.32-431.el6.x86_64. The kernel I'm using at the moment kernel-2.6.32-358.6.2.el6.x86_64 and that runs without monitor issues.
Old 12-11-2013, 11:27 PM   #2
John VV
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Registered: Aug 2005
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Are you using a nvidia or ATI/AMD 3d card ?

also HOW did you upgrade
using the 6.x repo
"yum update"
installing the 6.5 repo IN 6.4
then " yum upgrade"
or this
" yum --releaserver=6.5 upgrade"

using the install dvd and select " upgrade an existing install"

also what third party repos were STILL enabled during that upgrade
rpmforge might have issues
and so might elrepo and epel might also

Last edited by John VV; 12-11-2013 at 11:29 PM.
Old 12-12-2013, 04:35 AM   #3
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Registered: Aug 2011
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Distribution: Centos 5 / 6
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Check the release notes and the "Known Issues" for details of multi-monitor setups.
Old 12-12-2013, 08:15 AM   #4
Registered: Jun 2012
Posts: 258

Original Poster
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I should have been more clear. I saw on my taskbar that updates were available so I went ahead to install them. When the dialog opened it reported though that I had over 300 packages available for update. Normally these update notices only include a handful of packages. This one turned out to be the 6.5 upgrade, although I didn't realize it at the time. I did not explicitly run yum update/upgrade, I was relying on the GUI tool to handle things. Would this approach have performed the full upgrade?

Regardless, after the 300+ packages were installed it indicated I needed to reboot and it was after that I discovered my 30" monitor no longer worked, turning off just as the login prompt is displayed. I rebooted again and selected my previous kernel and this solved my monitor issue. So right now I guess I'm running a hybrid version of 6.4/6.5.

I have an NVidia video card (GT 640). I don't see anything about multiple monitor configurations being a known issue but my guess is that the driver for my monitor doesn't like the new kernel.

My repo list looks like this:

Old 12-12-2013, 02:16 PM   #5
John VV
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Registered: Aug 2005
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if you were using the driver you are now using the nouveau driver

or do you have the nvidia.repo installed ?
( it dose not look like it )
were you using the "kmod-nvidia.rpm "

nvidia DID kill off the use of 4 monitors , but 3 are still able to be used

from the last post you ARE using the centos 6.x repo
and have auto updates enabled

this will auto upgrade the install
but if you have conflicting repos installed and enabled ????
??? there might be some nasty complications ?? maybe

a list of files in the /etc/yum.repo.d folder is only part of the needed info
the output of this is what is needed
su -
yum repolist all

if "epel-testing.repo" is turned on ??? there can be some very nasty problems if you are not taking the NEEDED precautions

the same goes for " CentOS-Vault.repo" the vault is the old and now dead versions of centos
this can cause big problems if it is enabled all the time

and "remi.repo" can cause rpm incompatibility issues
do you have "yum-priorities-plugin" installed ? AND CONFIGURED !

Last edited by John VV; 12-12-2013 at 02:18 PM.
Old 12-12-2013, 05:54 PM   #6
Registered: Jun 2012
Posts: 258

Original Poster
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The only repo I explicitly added to my collection was epel. The others have made there way there without me knowing directly realizing it. If there are some in this list that are not needed and especially if any cause more harm than good, I'd be happy to remove them. The yum repolist is reported to be:
C6.4-base                      CentOS-6.4 - Base                                           disabled
C6.4-centosplus                CentOS-6.4 - CentOSPlus                                     disabled
C6.4-contrib                   CentOS-6.4 - Contrib                                        disabled
C6.4-extras                    CentOS-6.4 - Extras                                         disabled
C6.4-updates                   CentOS-6.4 - Updates                                        disabled
adobe-linux-x86_64             Adobe Systems Incorporated                                  enabled:        2
base                           CentOS-6 - Base                                             enabled: 6,352+15
c6-media                       CentOS-6 - Media                                            disabled
centosplus                     CentOS-6 - Plus                                             disabled
chromium-el6                   CentOS-6 - Chromium EL6                                     enabled:        5
contrib                        CentOS-6 - Contrib                                          disabled
debug                          CentOS-6 - Debuginfo                                        disabled
epel                           Extra Packages for Enterprise Linux 6 - x86_64              enabled:   10,082
epel-testing                   Extra Packages for Enterprise Linux 6 - x86_64 - Debug      disabled
epel-testing                   Extra Packages for Enterprise Linux 6 - Testing - x86_64    disabled
extras                         CentOS-6 - Extras                                           enabled:       13
google-chrome                  google-chrome                                               enabled:        3
pgdg92                         PostgreSQL 9.2 6 - x86_64                                   enabled:      298
pgdg92-source                  PostgreSQL 9.2 6 - x86_64 - Source                          disabled
remi                           Les RPM de remi pour Enterprise Linux 6 - x86_64            disabled
updates                        CentOS-6 - Updates                                          enabled:      170
I've left out a bunch of disabled ones from older versions of CentOS. I see that there is no explicit 6.5 entry but I assume the "updates" repo takes care of that.
Old 12-12-2013, 08:17 PM   #7
John VV
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Registered: Aug 2005
Posts: 15,894

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but I assume the "updates" repo takes care of that.
no the base repo is set to use 6 and not 6.4 or 6.5
( the auto upgrade)

A lot of people like to have this turned off
a distro upgrade in the middle of a complex project is NOT FUN to have happen
if you have NOT tested any of the mission critical software

The others have made there way there without me knowing directly realizing it.
i see " remi " is turned off
firefox26 is in that one

chromium-el6 is for the opensource version of the google browser

google-chrome is well for installing the google closed source browser

adobe-linux-x86_64 is for flash
seeing as 11.2 is the VERY LAST flash plugin for linux
This can be turned off
( the adobe repo has a VERY NASTY habit of going offline and stalling a normal "yum update" )

you might want to have a read through the cent wiki
the section on third party repos
and the warning !!!!!!
with the link to "yum-plugin-priorities"
( you DO need to set it up and configure the system
installing only will not help .
the software repo files MUST be set up to use it !

as for the 3 monitors
You have a Nvidia 3d card
if nvidia then the opensource Nouveau driver got reinstalled and you have to reinstall the nvidia driver

dose this work?
su -
if that gui pops up you have the nvidia driver installed ?
the current driver is the 331.20

Last edited by John VV; 12-12-2013 at 08:21 PM.


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