RE: Blank LCD display

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We've had exactly this problem.

Replace the "nsc" driver with the standard "vesa" driver.

The configure program sometimes incorrectly identifies the geode graphics
engine.

We never got to the bottom of it and now that AMD have taken over Geode from
National (who took it over from Cyrix) I don't hold out much hope of it ever
being fixed.  AMD have there own embedded processors and the GEODE was a
competitor.  Which chips do you think AMD will put the support effort into.

Also I'm a bit worried by the refresh rate you are driving the LCD at.  Most
work best at around 50/60 HZ.  Suggest you fix on the optimum refresh rate
for your LCD and just have that rate specified in your XF86Config file.

Kevin
email:   kevin.benstead@xxxxxxxxxx 
Tel:       +44 (0)118 971 5032


-----Original Message-----
From: Miller, Marlena [mailto:mmiller@xxxxxxxxx] 
Sent: 08 July 2004 14:05
To: xfree86@xxxxxxxxxxx
Subject:  Blank LCD display

I am using X version 4.3.0 on Linux kernel version 2.4.10-1. I am trying to
get a LCD display working, and am running into problems with X. When I start
X windows, the LCD display goes blank. When I exit X, my LCD display comes
back. I have checked, and my kernel was built without APM_DISPLAY_BLANK set.
The display is 6 1/2" diagonal and the resolution is 640x480. 

Does anyone have an idea what the problem could be? What can I do to further
diagnose this problem?

Regards,
Marlena Miller

An excerpt from my XF86Cconfig file follows:

===========================
Section "Monitor"

# The identifier line must be present.

    Identifier	"Optrex LCD"
    HorizSync	30-115         # multisync
    VertRefresh	50-60        # multisync

# Modes can be specified in two formats.  A compact one-line format, or
# a multi-line format.
##########################################################################

Modeline "640x480-85"    40.5   640  663  752  832   480  481  484  509
Modeline "640x480-75"    31.5   640  656  720  840   480  481  484  500
Modeline "640x480-72"    31.5   640  663  704  832   480  489  492  520
Modeline "640x480-60"    25.175 640  656  752  800   480  490  492  525

EndSection

# **********************************************************************
# Graphics device section
# **********************************************************************

Section "Device"
	Identifier	"Geode"
	Driver		"nsc"
	Option		"HWcursor"
	Option		"OffScreenMemory"
	VideoRam	4096
EndSection


# **********************************************************************
# Screen sections.
# **********************************************************************

# Any number of screen sections may be present.  Each describes
# the configuration of a single screen.  A single specific screen section
# may be specified from the X server command line with the "-screen"
# option.

Section "Screen"

# The Identifier, Device and Monitor lines must be present

    Identifier	"Screen 0"
    Device	"Geode"
    Monitor	"Optrex LCD"

# The favoured Depth and/or Bpp may be specified here
# CRT modes
    DefaultDepth 16

    SubSection "Display"
        Depth		8
        Modes		"640x480-85" "640x480-75" "640x480-72" "640x480-60"
    EndSubsection

    SubSection "Display"
        Depth		16
	Modes		"640x480-85" "640x480-75" "640x480-72" "640x480-60"
    EndSubsection

EndSection

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