Xorg Frequencies for laptop

synapse · 05-31-2005, 02:57 AM

Hi just a question , what frequencies am I supposed to be using for a laptop.
A bit puzzled here as its a lcd and not a crt so does the frequencys in xorg matter at all ? Ive changed it to an arb value and theres no difference in the display ?

Thanx for the help
cheers

noxious · 05-31-2005, 08:42 AM

I have Slackware on a Compaq M700 and it's numbers are:

HorizSync 31.5, 35.15, 35.5
VertRefresh 50-90

That gives me 1024x768 with 85Hz.

Nobber · 05-31-2005, 08:51 AM

The manual for my LCD monitor says that the optimal vertical refresh rate to use is 60Hz. I don't understand why that would be, but I've used that figure on every other LCD screen I've come across since and it seems to work fine.

slackist · 05-31-2005, 09:22 AM

My Thinkpad R51 works great with the following settings:

HorizSync 31.5 - 57.0
VertRefresh 50-100

1024x768 resolution, 60 Hz and an Intel Extreme 2 onboard graphics

wpyh · 06-01-2005, 08:05 AM

Quote:

Originally posted by noxious
I have Slackware on a Compaq M700 and it's numbers are:

HorizSync 31.5, 35.15, 35.5
VertRefresh 50-90

That gives me 1024x768 with 85Hz.

How do you check the refresh rate (85Hz)? And, is it safe if I set it to something higher? or lower? I'm using 70Hz on my LCD now.

dunric · 06-01-2005, 10:14 AM

AFAIK LCD(TFT) displays are running at fixed frequency so there is no point to tweak it in any way like at CRT monitors.
X server probes at start monitor capabilities incl. supported modes&frequencies and checks them against configuration settings and card capabilities. Probed modes could be found in /var/log/Xorg.0.log (or XFree86.0.log) or current mode interactively by xvidtune utility, for example.