Plugging in a new monitor

Hi all,

I have an RHEL5 machine which had a working X11 config
attached to an 
old CRT monitor.

The monitor has given up the ghost, so we tried to plug in
an LG L1953T 
LCD display. Immediately we got the error "analog: out
of range" on the 
monitor, which is not too much of a surprise, X in theory
needs to be 
reconfigured.

Googling showed that we needed to run the following:

system-config-display --reconfig --noui

Trouble, is, this doesn't autodetect the monitor, and
despite the 
updated xorg.conf file, the error remains.

It seems that RHEL5 is capable of autodetecting the monitor
during 
initial system setup, but for the life of me I cannot find a
way to redo 
the X configuration process after the fact?

Is reconfiguring Xwindows this difficult or am I missing
something 
really obvious?

Does anyone know what command must be run to autodetect and
set up X?

Regards,
Graham
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A quick way to get it to see the monitor should be to move
the xorg.conf 
file out the way via a ssh session, then on the console, do

CTRL-ALT-BACKSPACE to reload the X11 config, which wont be
there, 
therefore run through the inital config. if the session
isn't logged in, 
do ALT-F7 to get a text terminal and startx from there.

Good Luck.

Graham Leggett wrote:
> Hi all,
>
> I have an RHEL5 machine which had a working X11 config
attached to an 
> old CRT monitor.
>
> The monitor has given up the ghost, so we tried to plug
in an LG 
> L1953T LCD display. Immediately we got the error
"analog: out of 
> range" on the monitor, which is not too much of a
surprise, X in 
> theory needs to be reconfigured.
>
> Googling showed that we needed to run the following:
>
> system-config-display --reconfig --noui
>
> Trouble, is, this doesn't autodetect the monitor, and
despite the 
> updated xorg.conf file, the error remains.
>
> It seems that RHEL5 is capable of autodetecting the
monitor during 
> initial system setup, but for the life of me I cannot
find a way to 
> redo the X configuration process after the fact?
>
> Is reconfiguring Xwindows this difficult or am I
missing something 
> really obvious?
>
> Does anyone know what command must be run to autodetect
and set up X?
>
> Regards,
> Graham
> -- 
>
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>
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Graham Leggett wrote:

> I have an RHEL5 machine which had a working X11 config
attached to an 
> old CRT monitor.
> 
> The monitor has given up the ghost, so we tried to plug
in an LG L1953T 
> LCD display. Immediately we got the error "analog:
out of range" on the 
> monitor, which is not too much of a surprise, X in
theory needs to be 
> reconfigured.
> 
> Googling showed that we needed to run the following:
> 
> system-config-display --reconfig --noui
> 
> Trouble, is, this doesn't autodetect the monitor, and
despite the 
> updated xorg.conf file, the error remains.
> 
> It seems that RHEL5 is capable of autodetecting the
monitor during 
> initial system setup, but for the life of me I cannot
find a way to redo 
> the X configuration process after the fact?
> 
> Is reconfiguring Xwindows this difficult or am I
missing something 
> really obvious?
> 
> Does anyone know what command must be run to autodetect
and set up X?

After some more Googling I found the raw autodetect feature
of X, like this:

X -configure

The resulting xorg.conf file correctly detects the refresh
rate, as follows:

         HorizSync    30.0 - 83.0
         VertRefresh  56.0 - 75.0

This matches the spec on the monitor.

The monitor still doesn't work - analog out of range
remains.

The monitor works fine when plugged into a Mac (using the
VGA analog 
port). Are LG monitors compatible with Redhat Enterprise?

Anyone have any ideas?

Regards,
Graham
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Alasdair Gow wrote:

> A quick way to get it to see the monitor should be to
move the xorg.conf 
> file out the way via a ssh session, then on the
console, do 
> CTRL-ALT-BACKSPACE to reload the X11 config, which wont
be there, 
> therefore run through the inital config. if the session
isn't logged in, 
> do ALT-F7 to get a text terminal and startx from
there.

I tried this, and startx went through all the correct
motions (watching 
the console output from X). Made no difference though -
monitor still 
said "out of range".

This is the full console output of X, is there anything in
here that 
indicates a problem?

[rootgatekeeper etc]# startx
xauth:  creating new authority file /root/.serverauth.27346


X Window System Version 7.1.1
Release Date: 12 May 2006
X Protocol Version 11, Revision 0, Release 7.1.1
Build Operating System: Linux 2.6.9-67.0.1.ELsmp x86_64 Red
Hat, Inc.
Current Operating System: Linux gatekeeper.xxx
2.6.18-53.1.13.el5xen #1 
SMP Mon Feb 11 13:41:50 EST 2008 x86_64
Build Date: 18 January 2008
Build ID: xorg-x11-server 1.1.1-48.26.el5_1.5
         Before reporting problems, check http://wiki.x.org
         to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default
setting,
         (++) from command line, (!!) notice, (II)
informational,
         (WW) warning, (EE) error, (NI) not implemented,
(??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue
May  6 12:57:38 2008
(EE) Unable to locate/open config file
New driver is "ati"
(==) Using default built-in configuration (55 lines)
(EE) open /dev/fb0: No such file or directory
(**) RADEON(0): RADEONPreInit
(**) RADEON(0): RADEONScreenInit b0000000 0
(**) RADEON(0): Map: 0xb0000000, 0x01000000
(**) RADEON(0): RADEONSave
(**) RADEON(0): RADEONSaveMode(0x1e352808)
(**) RADEON(0): Read: 0x0000000c 0x000500b3 0x00000000
(**) RADEON(0): Read: rd=12, fd=179, pd=5
(**) RADEON(0): RADEONSaveMode returns 0x1e352808
(**) RADEON(0): RADEONInitMemoryMap() :
(**) RADEON(0):   mem_size         : 0x04000000
(**) RADEON(0):   MC_FB_LOCATION   : 0xb3ffb000
(**) RADEON(0):   MC_AGP_LOCATION  : 0xffffffc0
(**) RADEON(0): RADEONModeInit()
1600x1200     162.00  1600 1664 1856 2160  1200 1201 1204
1250 (24,32) +H +V
1600x1200     162.00  1600 1664 1856 2160  1200 1201 1204
1250 (24,32) +H +V
(**) RADEON(0): Pitch = 13107400 bytes (virtualX = 1600,
displayWidth = 
1600)
(**) RADEON(0): dc=16200, of=32400, fd=144, pd=2
(**) RADEON(0): TMDS_PLL from 6a4 to a3f
(**) RADEON(0): RADEONInit returns 0x1e3531b8
(**) RADEON(0): RADEONRestoreMode()
(**) RADEON(0): RADEONRestoreMemMapRegisters() :
(**) RADEON(0):   MC_FB_LOCATION   : 0xb3ffb000
(**) RADEON(0):   MC_AGP_LOCATION  : 0xffffffc0
(**) RADEON(0):   Map Changed ! Applying ...
(**) RADEON(0):   Map applied, resetting engine ...
(**) RADEON(0): Updating display base addresses...
(**) RADEON(0): Memory map updated.
(**) RADEON(0): Programming CRTC1, offset: 0x00000000
(**) RADEON(0): Wrote: 0x0000000c 0x00010090 0x00000000
(0x0000a500)
(**) RADEON(0): Wrote: rd=12, fd=144, pd=1
(**) RADEON(0): GRPH_BUFFER_CNTL from 20005c5c to 20135c5c
(**) RADEON(0): RADEONSaveScreen(0)
(**) RADEON(0): Setting up initial surfaces
(**) RADEON(0): Initializing fb layer
(**) RADEON(0): Setting up accel memmap
(**) RADEON(0): Initializing backing store
(**) RADEON(0): Setting up final surfaces
(**) RADEON(0): Initializing Acceleration
(**) RADEON(0): EngineInit (32/32)
(**) RADEON(0): Pitch for acceleration = 200
(**) RADEON(0): EngineRestore (32/32)
(**) RADEON(0): Initializing DPMS
(**) RADEON(0): Initializing Cursor
(**) RADEON(0): Initializing color map
(**) RADEON(0): Initializing DGA
(**) RADEON(0): Initializing Xv
(**) RADEON(0): RADEONScreenInit finished
(**) RADEON(0): RADEONSaveScreen(2)
localuser:root being added to access control list
No profile for user 'root' found
(**) RADEON(0): RADEONSwitchMode() !n(**) RADEON(0):
RADEONModeInit()
1024x768      162.00  1024 1664 1856 2160   768 1201 1204
1250 (24,32) -H -V
1024x768      162.00  1024 1664 1856 2160   768 1201 1204
1250 (24,32) -H -V
(**) RADEON(0): Pitch = 13107400 bytes (virtualX = 1024,
displayWidth = 
1600)
(**) RADEON(0): dc=16200, of=32400, fd=144, pd=2
(**) RADEON(0): TMDS_PLL from 6a4 to a3f
(**) RADEON(0): RADEONInit returns 0x1e3531b8
(**) RADEON(0): RADEONRestoreMode()
(**) RADEON(0): RADEONRestoreMemMapRegisters() :
(**) RADEON(0):   MC_FB_LOCATION   : 0xb3ffb000
(**) RADEON(0):   MC_AGP_LOCATION  : 0xffffffc0
(**) RADEON(0): Updating display base addresses...
(**) RADEON(0): Memory map updated.
(**) RADEON(0): Programming CRTC1, offset: 0x00000000
(**) RADEON(0): Wrote: 0x0000000c 0x00010090 0x00000000
(0x0000a500)
(**) RADEON(0): Wrote: rd=12, fd=144, pd=1
(**) RADEON(0): GRPH_BUFFER_CNTL from 20005c5c to 20135c5c
(**) RADEON(0): EngineRestore (32/32)

Regards,
Graham
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Graham Leggett wrote:
> Hi all,
> 
> I have an RHEL5 machine which had a working X11 config
attached to an 
> old CRT monitor.
> 
> The monitor has given up the ghost, so we tried to plug
in an LG L1953T 
> LCD display. Immediately we got the error "analog:
out of range" on the 
> monitor, which is not too much of a surprise, X in
theory needs to be 
> reconfigured.

_I_ am surprised, I've not had to reconfigure for a screen
for some 
time. Perhap you run a higher resolution than my eyes can
cope with. 
Pick and choose from this:
# Xorg configuration created by system-config-display

Section "ServerLayout"
         Identifier     "single head
configuration"
         Screen      0  "Screen0" 0 0
         InputDevice    "Keyboard0"
"CoreKeyboard"
EndSection

Section "InputDevice"
         Identifier  "Keyboard0"
         Driver      "kbd"
         Option      "XkbModel" "pc105"
         Option      "XkbLayout" "us"
EndSection

Section "Device"
         Identifier  "Videocard0"
         Driver      "i810"
EndSection

Section "Screen"
         Identifier "Screen0"
         Device     "Videocard0"
         DefaultDepth     24
         Option         "Rotate" 
"left"
         SubSection "Display"
                 Viewport   0 0
                 Depth     24
         EndSubSection
EndSection

19:05 [summernumbat ~]$

It works fine on my LCD screens running Scientifiuc Linux 5
(A RHEL 5 
clone).
> 
> Googling showed that we needed to run the following:
> 
> system-config-display --reconfig --noui
> 
> Trouble, is, this doesn't autodetect the monitor, and
despite the 
> updated xorg.conf file, the error remains.
> 
> It seems that RHEL5 is capable of autodetecting the
monitor during 
> initial system setup, but for the life of me I cannot
find a way to redo 
> the X configuration process after the fact?
> 
> Is reconfiguring Xwindows this difficult or am I
missing something 
> really obvious?
> 
> Does anyone know what command must be run to autodetect
and set up X?

Give this a go:As root
X -configure

and if that works, take its advice.

>


Cheers
John

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