[elrepo] help troubleshooting detection of external monitor

[Denis Leclair]

That's correct Alan. For other people's benefit in case you haven't gone 
to my post on the CentOS forum, xrandr is not returning anything for the 
VGA port or any other port for that matter. The output is shown here:

Output from xrandr:

CODE:SELECT ALL <https://www.centos.org/forums/viewtopic.php?f=21&t=45930#>
    |[dleclair at 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 at dleclair-lptp Downloads]$
    |




On 04/15/14 4:10 PM, Alan Bartlett wrote:
> On 15 April 2014 21:09, Alan Bartlett <ajb at elrepo.org> wrote:
>> On 15 April 2014 20:41, Denis Leclair <denis at theleclairs.ca> wrote:
>>> I have CentOS 6.5 running on an HP EliteBook 840 G1 with kernel-ml. The
>>> problem is, I'm not getting any detection of the external monitor that I
>>> have plugged in to the VGA port. I'm not sure where to beging
>>> troubleshooting this problem and I'm not finding a whole of advice online
>>> either.
>>>
>>> The details of what I get from xrandr as well as other system information
>>> can be found on this post I added to the CentOS forums:
>>> https://www.centos.org/forums/viewtopic.php?f=21&t=45930
>>>
>>> I would appreciate any advice on things that I should check for or
>>> additional reading I can do on the topic.
>>>
>>> Thanks.
>> I'd suggest that you consider using xrandr.
>>
>> Look to see what interfaces it recognises, by default. Plug in the
>> external monitor and use xrandr to activate the interface.
>>
>> For example, with my Dell Latitude E5500 I see the following --
>>
>> [Duo2 ~]$ xrandr
>> Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
>> LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y
>> axis) 331mm x 207mm
>>     1280x800       60.0*+   59.8     59.9     40.0
>>     1280x768       59.9     60.0
>>     1024x768       60.0
>>     800x600        60.3     56.2
>>     848x480        60.0
>>     640x480        59.9
>> VGA1 disconnected (normal left inverted right x axis y axis)
>> HDMI1 disconnected (normal left inverted right x axis y axis)
>> DP1 disconnected (normal left inverted right x axis y axis)
>> HDMI2 disconnected (normal left inverted right x axis y axis)
>> DP2 disconnected (normal left inverted right x axis y axis)
>> DP3 disconnected (normal left inverted right x axis y axis)
>> TV1 disconnected (normal left inverted right x axis y axis)
>> [Duo2 ~]$
>>
>> Alan.
> Oops. Ignore that. I now see that you have already looked into using xrandr.
>
> Alan.
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