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Old 11-23-2013, 05:01 PM   #1
Registered: Jul 2012
Posts: 234

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Dual Monitor Centos 6 Problem......

Hi All,
I have an ASUS A55A laptop, with the latest BIOS installed 2.15.1226 aka BIOS 407 running Centos 6.4 64bit. I am trying to connect an external monitor to the laptop, so I can extend the desktop. I am using the GNOME desktop environment.

I plug the external monitor in to the VGA port and press FN F8 and get no result.

These are the laptops default Settings:

xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768
default connected 1368x768+0+0 0mm x 0mm
   1366x768        0.0  
   1368x768        0.0*
If I restart the laptop with the Monitor plugged in then loads the desktop on the Monitor only and not the laptop screen.

Here are the external monitor settings:

xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1440 x 1024, maximum 1440 x 1024
default connected 1440x1024+0+0 0mm x 0mm
   1280x1024       0.0  
   1440x900        0.0  
   1024x768        0.0  
   800x600         0.0  
   640x480         0.0  
   1440x1024       0.0*

When plugging the Monitor in and out with the terminal loaded, I have seen this error before:
kernel:Disabling IRQ #16

More information on the drivers loaded:
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

lsmod | grep video
uvcvideo               62688  0 
videodev               75708  1 uvcvideo
v4l2_compat_ioctl32     7110  1 videodev
i2c_core               31084  6 videodev,i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
video                  20674  1 i915
output                  2409  1 video

The default xorg.conf

cat /etc/X11/xorg.conf
Section "Device"
	Identifier "Videocard0"
	Driver "vesa"
Can someone please assist me with the xorg.conf I should have???

Thanks in advanced!
Old 11-24-2013, 08:02 AM   #2
Registered: Oct 2013
Location: Maine
Distribution: BT 5
Posts: 68

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You probably need some nvidia! I think it is nouvau? Something like that. Google it. Install it. Upgrade it. You need Nvidia! You may want to do an upgrade to if you have not.
Old 11-24-2013, 08:37 AM   #3
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Tech7, as far as I can tell the A55 doesnt have an nVidia GPU, even as an option. So 'gettting nVidia' wil not help. BTW, if it did have an nVidia GPU it would be an 'optimus' setup, and to get that running properly you need bumblebee.
Old 11-24-2013, 09:42 AM   #4
Registered: Oct 2013
Location: Maine
Distribution: BT 5
Posts: 68

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If you have ati it may be a lil complicating to set up, though I read once you get it working it works well..
-Out of my league.

Last edited by Tech7; 11-24-2013 at 09:57 AM.
Old 11-24-2013, 02:32 PM   #5
John VV
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as i recall from reading the vesa on rhel/centos 6 is not working well

and you have a intel chip
the driver used should be intel and vesa
Old 11-24-2013, 03:18 PM   #6
Registered: Jul 2012
Posts: 234

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Yes John VV is correct. It's not a Nvidia or ATI it's the the built Intel Video Chip.

As reading from below, I should change the driver from Vesa to Intel.

Also specified here: If the
option is in the grub.conf on the kernel line I have to remove it.

I will see how this runs after the changes.

Also if needed I should get the Intel Drivers from the ElREPO yum repo:



Hopefully this will detect the external monitor when plugged into the laptop, and possibly the "Displays" menu in RHEL6 will create the xorg.conf needed....


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