Xorg changing modes
Greg 'groggy' Lehey
grog at FreeBSD.org
Fri Jul 15 05:51:43 GMT 2005
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"
>> 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).
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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
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