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bruhor

4 Posts

17859

January 8th, 2004 20:00

D600 CRT Monitor 1400x1050 @ 75 hz

I have a Latitude D600 with an LCD panel that displays at 1400x1050. When using the terminal at my desk I usually attach it to a 21" CRT monitor. I would like to maintain the same resolution (1400x1050) on the monitor but the only refresh rate that I can get is 60 hz. (Under list all modes only 60hz is shown at resolution 1400x1050). At both 1280x1024 and 1600x1200 I am prompted for higher refresh rates. Unfortunately at 60hz there is too much flicker on the monitor. The mobile Radeon 9000 is driver version 6.14.10.6371. I am running Windows 2000.

DELL-Corey

2.6K Posts

January 9th, 2004 19:00

bruhor,

The 60hz limitation is due to the fact that that is the LCD’s innate refresh rate.
I don’t think you will be able to change that.

bruhor

4 Posts

January 9th, 2004 20:00

Dell-Corey,

I don't want to have a higher rate than 60 hz on the LCD. At this rate there is no "visible" flicker on the LCD.

The problem is when attaching an external monitor. Then I want to have on the external monitor a higher refresh rate (on the external monitor only). For example: at 1280x1024 and 1600x1200 I have had 75hz rate on the external monitor. When using the external monitor I do not use the LCD display.

My reason for wanting to use 1400X1050 resolution on the external monitor is so that all my settings (for example the placement of icons on the desktop, scaling of fonts in my web browser etc. will not change in the different environments that I use).

Regards,

bruhor

ToadX

72 Posts

January 22nd, 2004 03:00

Did you disable the other displays that it might be displaying on?  I had that same problem once (never tried at that high resolutions though), and I was only able to change it higher than 60hz after I disabled the laptops own LCD and displayed it on the CRT only.  Make sure you uncheck "Hide modes that this monitor cannot display" also since sometimes it detects it wrong and won't let you select a mode that your monitor really can display.

bruhor

4 Posts

January 22nd, 2004 14:00

Yes, I have disabled all other displays. Like you I have noticed that I have less resolution options if I am using both the LCD and the CRT. I have tried using both the docking unit and not using the docking unit. The same list is shown in both cases.

To determine which resolutions that are available I have gone in under Mobile Radeon 9000 (under the adaptor tab from display properties/advanced) and list all modes. The highest resolution diplayed is 1792x1394 / 90 hz / 32 bit. At the resolution I want 1400 x 1050 only 60 hz is available. I have tried to use the refresh rate overide (a displays option) and set it to 75 hz but I can still only get 60 hz.

maaroe

6 Posts

January 24th, 2004 14:00

I would suggest trying PowerStrip for adjustning refreshrates. In my experience your problem is mostly found when your CRTs driver does not have the selected resolution as a native resolution - then windows just selects the "safe" 60 Hz. Powerstrip goes around this, but also allows refresh rates that can potentially damage your monitor, so be carefull...

Morten

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