[Lel4_user] Interlaced monitor display mode

[jekarkka at mappi.helsinki.fi]

The monitor (Sony GDM-F400 19") is six years old and has better than average
graphic properties. I have used the monitor for years employing interlaced
mode in both Windows and (Redhat) linux. At present  I can use interlaced
mode in Windows XP but not in Lineox (lel4).
I Redhat (6.0) I was able to configure XFree according to the instructions
below, but my attempts to make changes to the file /etc/X11/xorg.conf in
lel4, have been unsuccessful.
regards Jorma

INSTRUCTIONS (from the molecular modelling program "WHATIF" manual")

Setting up X11 (I only describe here XFree86)
What I am doing in my Linux PC is just having two modes of the same
resolution and depth (bits per pixel) but one is interlaced and the other is
not. In the XFree86 X11 server you can switch from the non interlaced to the
interlaced (stereo) and back (mono), just pressing CTRL-ALT and the keypad
plus (+) or minus (-) keys simultaneously, and in this way I just switch to
interlace when I'm going to use the stereo glasses, while using normally the
other non-interlace mode.

BE CAREFUL !!!, REALLY CAREFUL !!, and ask your system manager (he/she
should setup XFree86 for you anyway), check your monitor specs if you copy
my modes, BE REALLY SURE that they are compatible with your hardware, YOU
HAVE BEEN WARNED !!!!!

# Video configuration lines for my XFree86 server
# MY MONITOR IS CAPABLE OF 160Hz, BE CAREFUL !!!!
#
# 1280x1024, 90Hz  Non interlace
#
Mode "R1"  
        DotClock 161.947  
        HTimings 1280 1296 1440 1688  
        VTimings 1024 1025 1028 1066
EndMode
#
# 1280x1024, 160Hz Interlace (80Hz per eye)
#
Mode "R2"    
        DotClock 144.00  
        HTimings 1280 1296 1440 1664  
        VTimings 1024 1025 1028 1083
        Flags "Interlace"
EndMode
#
# 1280x1024, 124Hz Interlace (62Hz per eye)
#
Mode "R3"    
        DotClock 110.00  
        HTimings 1280 1296 1440 1664  
        VTimings 1024 1025 1028 1083
        Flags "Interlace"
EndMode

>From the above settings you could see that I'm driving my monitor to 160Hz
refresh rate to get 80Hz of refresh per eye, that seems very good to cancel
the flickering (see below) that do ocurr at lower display rates, if your
display can not take 160 Hz you can try the 124Hz mode that still is flicker
free (for me). I actually do not reccomend going below 120 Hz in interlace
modes, but still you can try