Re: video equipment still forcing my laptop to a lower res, argh

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Robert P. J. Day wrote:
> Quoting Ed Greshko <Ed.Greshko@xxxxxxxxxxx>:
>
>> Robert P. J. Day wrote:
>>> Quoting Ed Greshko <Ed.Greshko@xxxxxxxxxxx>:
>>>
>>>> Ed Greshko wrote:
>>>>> Robert P. J. Day wrote:
>>>>>
>>>>>>   ok, i've fought with this for a bit but still have no
>>>>>> solution.  to
>>>>>> recap, dell inspiron 9200, WUXGA (1920x1200) display, now running
>>>>>> F9,
>>>>>> runs in full WUXGA mode out of the box perfectly.
>>>>>>
>>>>>>   the instant i connect via VGA to a video processing unit (sorry, i
>>>>>> can't be more specific, i'm not allowed), when i restart the X
>>>>>> server,
>>>>>> it comes up in 1152x864.  why is this?  what is it about X that
>>>>>> connecting to an external VGA destination will drive the
>>>>>> resolution on
>>>>>> the laptop lower?  i'm baffled.
>>>>>>
>>>>>>
>>>>> The first place I would look is in /var/log/Xorg.0.log and
>>>>> determine if
>>>>> there is a difference between when X starts with the unit
>>>>> connected and
>>>>> when not connected.  The log file is generated upon X starting.
>>>>>
>>>> I should have added that this is probably hardware related. 
>>>> Chances are
>>>> the video chipset detects that it is attached to an external device
>>>> and
>>>> the external hardware is limited to the lower resolution and thus
>>>> reports this at X startup.
>>>
>>>   i'd thought of that, but i was *assured* by people who should know
>>> that
>>> the external hardware is not reporting anything back to the laptop. 
>>> and
>>> forgive my video-related ignorance, but what is *normally* reported
>>> back?
>>> in what format?  and is there a way to tap that info in real time (a la
>>> tcpdump)?  or is just checking the X log file the way to go?  thanks.
>>>
>>>
>> It may not be reporting anything at all.  The chipset simply detects
>> electrical connections on the external jack and does its thing.  I think
>> you will see a difference in the log file that indicates the higher
>> resolutions are not supported...I forget the exact wordings
>
>   ok, i'll get a chance to check that when i get into the workplace.  but
> is there any way to de-activate that checking within X?  from what you've
> written, i'm assuming that the X server sees what's happening, and
> consequently
> scales back on the resolution as a result.  is there an option to tell
> X to simply ignore that and go with full WUXGA no matter what?  thanks.
>
Not that I know of.  The HW is reporting to X what its capabilities are
and even if you tell X to ignore what the HW is saying the HW probably
won't respond to it very well.  :-)

-- 
Ten years of rejection slips is nature's way of telling you to stop
writing. -- R. Geis

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