how to troubleshoot external monitor detection

Issues related to hardware problems
Post Reply
dleclair
Posts: 11
Joined: 2014/04/12 01:34:02

how to troubleshoot external monitor detection

Post by dleclair » 2014/04/15 17:05:46

I've got CentOS 6.5 up and running on my laptop but my external monitor is not being detected. I'm not sure where to begin with troubleshooting this and I haven't been able to find much online related to this kind of problem either. Any pointers would be appreciated.

Here is some information that may be relevant to this problem. Please let me know if any additional information would be helpful.

Output from xrandr:

Code: Select all

[dleclair@dleclair-lptp Downloads]$ sudo xrandr -q
[sudo] password for dleclair: 
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080       0.0* 
[dleclair@dleclair-lptp Downloads]$ 
Additonal system information

Code: Select all

== BEGIN uname -rmi ==
3.14.0-1.el6.elrepo.x86_64 x86_64 x86_64
== END   uname -rmi ==

== BEGIN rpm -qa \*-release\* ==
rpmforge-release-0.5.3-1.el6.rf.x86_64
epel-release-6-8.noarch
centos-release-6-5.el6.centos.11.2.x86_64
adobe-release-x86_64-1.0-1.noarch
elrepo-release-6-6.el6.elrepo.noarch
== END   rpm -qa \*-release\* ==

== BEGIN cat /etc/redhat-release ==
CentOS release 6.5 (Final)
== END   cat /etc/redhat-release ==

== BEGIN getenforce ==
Enforcing
== END   getenforce ==

== BEGIN rpm -qa yum\* rpm-\* python | sort ==
python-2.6.6-52.el6.x86_64
rpm-build-4.8.0-37.el6.x86_64
rpm-libs-4.8.0-37.el6.x86_64
rpm-python-4.8.0-37.el6.x86_64
yum-3.2.29-43.el6.centos.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
yum-plugin-fastestmirror-1.1.30-17.el6_5.noarch
yum-plugin-security-1.1.30-17.el6_5.noarch
yum-utils-1.1.30-17.el6_5.noarch
== END   rpm -qa yum\* rpm-\* python | sort ==

== BEGIN ls /etc/yum.repos.d ==
adobe-linux-x86_64.repo
CentOS-Base.repo
CentOS-Debuginfo.repo
CentOS-Media.repo
CentOS-Vault.repo
dropbox.repo
elrepo.repo
epel.repo
epel-testing.repo
google-chrome.repo
mirrors-rpmforge
mirrors-rpmforge-extras
mirrors-rpmforge-testing
rpmforge.repo
== END   ls /etc/yum.repos.d ==

== BEGIN rpm -qa kernel\* | sort ==
kernel-2.6.32-431.11.2.el6.x86_64
kernel-2.6.32-431.el6.x86_64
kernel-firmware-2.6.32-431.11.2.el6.noarch
kernel-headers-2.6.32-431.11.2.el6.x86_64
kernel-ml-3.14.0-1.el6.elrepo.x86_64
== END   rpm -qa kernel\* | sort ==

== BEGIN lspci -nn ==
00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 0b)
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b)
00:03.0 Audio device [0403]: Intel Corporation Device [8086:0a0c] (rev 0b)
00:14.0 USB controller [0c03]: Intel Corporation Lynx Point-LP USB xHCI HC [8086:9c31] (rev 04)
00:16.0 Communication controller [0780]: Intel Corporation Lynx Point-LP HECI #0 [8086:9c3a] (rev 04)
00:16.3 Serial controller [0700]: Intel Corporation Lynx Point-LP HECI KT [8086:9c3d] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I218-LM [8086:155a] (rev 04)
00:1b.0 Audio device [0403]: Intel Corporation Lynx Point-LP HD Audio Controller [8086:9c20] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation Lynx Point-LP PCI Express Root Port 1 [8086:9c10] (rev e4)
00:1c.3 PCI bridge [0604]: Intel Corporation Lynx Point-LP PCI Express Root Port 4 [8086:9c16] (rev e4)
00:1c.5 PCI bridge [0604]: Intel Corporation Lynx Point-LP PCI Express Root Port 6 [8086:9c1a] (rev e4)
00:1d.0 USB controller [0c03]: Intel Corporation Lynx Point-LP USB EHCI #1 [8086:9c26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation Lynx Point-LP LPC Controller [8086:9c43] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation Lynx Point-LP SATA Controller 1 [AHCI mode] [8086:9c03] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation Lynx Point-LP SMBus Controller [8086:9c22] (rev 04)
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device [10ec:5227] (rev 01)
== END   lspci -nn ==

== BEGIN lsusb ==
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 002: ID 0424:2134 Standard Microsystems Corp.
Bus 002 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 004: ID 138a:003f Validity Sensors, Inc.
Bus 002 Device 005: ID 04f2:b3ed Chicony Electronics Co., Ltd
Bus 003 Device 002: ID 0424:5534 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 006: ID 8087:07dc Intel Corp.
== END   lsusb ==


Post Reply