Monitor refresh rate problem

Akaman · 01-08-2005, 03:25 AM

I can't change display refresh rate with KDE setting tools. It only gives the option of 61hz for 1024*768 and 73hz for 800*600 resoloution, though my monitor can support at least 75hz for 1024*768.
What should I do? This is a very annoying problem. It bothers my eyes when I try to read something! Any help appreciated.

mlsbraves · 01-08-2005, 04:12 AM

Though I have been using slackware(and linux in general) for about 6 months now, consider my advice as comming from a newbie :-) I'm going to assume that you are running slack 10 and thus using xorg. If you open your terminal and type 'xorgconfig' you can configure your display as well as other things(mouse, keyboard, graphic card, etc.). You can also open up /etc/X11/xorg.conf and manually edit your screen settings. If your using anything before slackware 10 I think it uses Xfree86. It you do want to change your xorg.conf though everything should be fine just make a copy for good practices. Hope this helps.

carboncopy · 01-08-2005, 04:13 AM

You need to edit your /etc/X11/xorg.conf file.

Make sure you have the following info on your monitor:
1. H-Scanning Frequency (Horizontal)
2. V-Scanning Frequency (Vertical)
3. Display size -- optional, good to have. Display size is the viewable size.

50 ~ 160 Hz

look for

Code:

Section "Monitor"
#DisplaySize      320   240     # mm
Identifier   "Monitor0"
VendorName   "LG"   
ModelName    "T710SH"  # you know what to do 
DisplaySize  325   243 #replace with your specs
HorizSync    30-71      #replace with your specs
VertRefresh  50-160   #replace with your specs
Option      "DPMS"
EndSection

snipet from man xorg.conf; you will find it useful

Code:

       HorizSync  horizsync-range
              gives the range(s) of horizontal sync frequencies supported by the  monitor.   horizsync-
              range  may  be  a  comma separated list of either discrete values or ranges of values.  A
              range of values is two values separated by a dash.  By default the values are in units of
              kHz.   They  may  be specified in MHz or Hz if MHz or Hz is added to the end of the line.
              The data given here is used by the Xorg server to determine if video modes are within the
              specifications  of  the  monitor.   This information should be available in the monitor's
              handbook.  If this entry is omitted, a default range of 28-33kHz is used.

       VertRefresh  vertrefresh-range
              gives the range(s) of vertical refresh frequencies supported  by  the  monitor.   vertre?
              fresh-range  may be a comma separated list of either discrete values or ranges of values.
              A range of values is two values separated by a dash.  By default the values are in  units
              of  Hz.   They  may  be  specified in MHz or kHz if MHz or kHz is added to the end of the
              line.  The data given here is used by the Xorg server to determine  if  video  modes  are
              within  the  specifications  of the monitor.  This information should be available in the
              monitor's handbook.  If this entry is omitted, a default range of 43-72Hz is used.

       DisplaySize  width height
              This optional entry gives the width and height, in millimetres, of the  picture  area  of
              the  monitor.  If given this is used to calculate the horizontal and vertical pitch (DPI)
              of the screen.

kornerr · 01-08-2005, 10:24 AM

Didn't know that "graphics" is called X Window?
If get any problem with X ALWAYS try:
enter "x", then press <Tab>. Shell will display all commands beginning with the letter "x". I was looking for it for 4 hours first day, cuz I had the same problem. But a few knowledge helped me.
NEVER FORGET ABOUT BIG SHELL HELP - TAB!!!

I found ALSA the same way - just cuz it's almoust the first command

jonr · 01-08-2005, 11:45 AM

Quote:

Originally posted by kornerr
Didn't know that "graphics" is called X Window?
If get any problem with X ALWAYS try:
enter "x", then press <Tab>. Shell will display all commands beginning with the letter "x". I was looking for it for 4 hours first day, cuz I had the same problem. But a few knowledge helped me.
NEVER FORGET ABOUT BIG SHELL HELP - TAB!!!
I found ALSA the same way - just cuz it's almoust the first command

Just remember that capitalization counts in Linux!

Another useful way to search for help in the shell is to type "apropos" followed by some word that might steer you in the right direction, such as "apropos sound". Doesn't always turn anything up, but often does. To keep the results readable in case there's lots of them, type it this way:

Code:

apropos sound | less

and it will halt after a screenful, and you can use PGUP and PGDN, arrow keys, etc. to navigate around. To get help with the "less" feature, just type "h" anytime during your viewing, and "q" to go back to what you were looking at.

kornerr · 01-08-2005, 12:14 PM

Thanks!