Xorg changing modes

[Greg 'groggy' Lehey]

[trimmed, resequenced]

On Thursday, 14 July 2005 at 22:36:09 -0700, Ross Penner wrote:
> On 7/14/05, Greg 'groggy' Lehey <grog at freebsd.org> wrote:
>> On Thursday, 14 July 2005 at 22:05:31 -0700, Ross Penner wrote:
>>> I've been having trouble getting Xorg to change video modes. I want it
>>> to run in 1280x1024 but it drops to 640x480 when I test it. I used the
>>> handbook as my guide.
>>
>> OK, a horizontal sync of 33 kHz is definitely far too low for that
>> kind of resolution.  Looking at the X config file, you have:
>>
>>> Section "Monitor"
>>> 	#DisplaySize	  370   300	# mm
>>> 	Identifier   "Monitor0"
>>> 	VendorName   "HIQ"
>>> 	ModelName    "L90D+ D-SUB"
>>>  ### Uncomment if you don't want to default to DDC:
>>> #	HorizSync    31.0 - 83.0
>>> #	VertRefresh  56.0 - 0.0
>>> 	Option	    "DPMS"
>>> EndSection
>>
>> That's funny, because X should recognize the commented-out values, but
>> it looks as if it can't find any information about the monitor by
>> itself.  Try uncommenting the two lines.
>
> Thanks for the quick reply. if I uncomment both lines, the config file
> won't parse. apparently the range after the vert refresh is improper
> (surprise surprise).

Please note what I wrote below:

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I reply to these messages for the benefit of others as well.

Looking at the entries in more detail, it's clear that VertRefresh is
incorrect.  Enter the correct values if your manual divulges them.

> uncommenting just the horizontal works fine though.

Yes, I'd expect that.

> Would I get better preformance by putting the correct values of the
> vert refresh range? I have an LCD.

The performance won't change, but it may help X choose a better mode
line.

Greg
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