Monitor refresh frequency.

[AdamR]

Hello!
I install PCLinuxOS 2010.1 KDE and I can't change refresh frequency.
I tried:
1) Use KDE Control Center
2) drak in PCLOS Control Center.

If I change in KDE CC, the frequency is good (60 to 75Hz), but after reboot the frequency is default - 60Hz.
I modified xorg.conf with modeline, but doesn't works.

[DBobb]

On GNU/Linux, some monitors report their refresh rates improperly -- which causes refresh rates and/or resolutions to be lower than what they should be. An entry to xorg.conf will sometimes solve the problem

Code: [Select]

Section "Monitor"
    Identifier   "Monitor0"
    VendorName   "Monitor Vendor"
    ModelName    "Monitor Model"
        HorizSync    30-137
        VertRefresh  48-170
EndSection
Pay attention to the lines which say HorizSync and VertRefresh. The ones for your individual monitor will likely be different, but if you know what they are and add the correct entry to xorg.conf under the monitor section, it will sometimes fix these kinds of problems when modelines fail.

[scoundrel]

if your using a flat panel lcd then the refresh rate is 60Hz

[AdamR]

I know, but I like 75Hz - then I haven't got the screen shift to the left (caused by open-source driver "radeon").
What can I do? I don't want black bar on the left.

[scoundrel]

click on the auto adjust on your panel ..

[uncleV]

I know, but I like 75Hz - then I haven't got the screen shift to the left (caused by open-source driver "radeon").
What can I do? I don't want black bar on the left.

It's better you tell are you with CRT or not?
And some more other hardware specs?

[iMoron]

The black bar may be because of your resolution setting. In LCD TVs I have experience this when the resolution is set to 1080x720 or 1024x768 when in fact the optimum resolution of the TV is 1366x768...

Look for the resolution your TV (monitor) supports and do as scoundrel says and use the auto adjust feature of your monitor. Be careful forcing your monitor with unsupported refresh rates!

[Was_Just19]

I know, but I like 75Hz - then I haven't got the screen shift to the left (caused by open-source driver "radeon").
What can I do? I don't want black bar on the left.

Use the correct native resolution of the monitor.

click on the auto adjust on your panel ..

+1


Ignore refresh rate ......  it is not applicable to LCD monitors. It should default to showing 60Hz.

regards.

[DBobb]

Most LCD's are designed to run at 60hz, if you go higher you risk shortening their lives drastically.

[AdamR]

Native resolution is 1280x1024, and of course I can use "adjust", but after adjust in PCLOS, I must "readjust" in Windows.

[Was_Just19]

Native resolution is 1280x1024, and of course I can use "adjust", but after adjust in PCLOS, I must "readjust" in Windows.

Yes that is the case ....

[uncleV]

Liquid Crystal Displays (LCD) don't need (as for now) refresh frequency more than 60 Hz because the LCD-pixel is slow compared to CRT-pixel. Slow light-up and slow decay.
So you could see flickering of CRT at 60 Hz but you can not for LCD.

[Was_Just19]

LCDs do not have a refresh rate like the CRT monitors.

CRTs have a refresh rate ......  that is the rate at which the picture is refreshed.

The picture in an LCD is not "drawn" on the screen as with a CRT, by a scanning electron gun exciting phosphor to give the pic.

The refresh rate of a CRT is the number of times per second that the electron beam traverses the screen and returns to the top.

In an LCD each pixel is controlled by the use of transistors whose transparency is controlled, and light from the 'backlight' becomes visible.

The important factor in LCDs from the user point of view is the 'response time' -- of those transistors IIUC.

There is a  'refresh' of the pic to be displayed from the video card .......  it updates the info to the LCD monitor at a particular rate. That is often about 60Hz, but is not the same thing as the refresh rate in a CRT monitor, which refers to how the display is refreshed.

So from the point of view of setting up the display the traditional refresh rate is meaningless and should be ignored.

That is my understanding of the matter.

regards.

[uncleV]

Good point! (applauding)

[AdamR]

My monitor is connected via DVI (adapter).
I think that DVI supports autoadjusting. right?