I've posted this question on a couple of local LUG lists with no joy,
so I thought I'd try here...
The headline is that, with one particular computer, I'm unable to
switch one particular monitor to DPMS off mode, and I'd like advice on
how to fix this, please.
The details:
I have two computers (say 1 and 2), both with built-in LCD screens,
plus two external monitors (A and B) that plug into VGA ports. The
results of running xset dpms force off (or trying to go to DPMS off
mode via xscreensaver) are as follows:
Computer 1 + no external monitor: built-in screen goes to DPMS off
mode.
Computer 1 + monitor A: monitor A goes to DPMS off mode, built-in
screen was in off mode anyway, from time computer was started with
monitor A plugged in.
Computer 1 + monitor B: monitor B goes to DPMS off mode, built-in
screen was in off mode anyway, from time computer was started with
monitor B plugged in.
Computer 2 + no external monitor: built-in screen goes to DPMS off
mode.
Computer 2 + monitor A: both built-in screen and monitor A go to DPMS
off mode.
Computer 2 + monitor B: built-in screen goes to DPMS off mode, monitor B stays
on, complaining that I should check signal cable.
So it seems all individual components work OK, and it's the
combination of computer 2 and monitor B that's problematic.
In each case, the monitor behaviour when the computer is switched off
altogether is the same as that in response to xset dpms force off.
Thanks very much,
Dan
Some details that might help:
Computer 1 has an Intel Corporation Mobile 915GM/GMS/910GML Express
Graphics Controller (rev 03), and runs Fedora 9 with xorg 1.5.2-6.fc9.
Computer 2 has an Intel Corporation Mobile 945GME Express Integrated
Graphics Controller (rev 03), and runs Gentoo with xorg 7.2.
Monitor A is a Samsung SyncMaster 710N.
Monitor B is an LG Flatron W2234S.
xorg.conf from computer 1
# Xorg configuration created by system-config-display
Section ServerLayout
Identifier single head configuration
Screen 0 Screen0 0 0
InputDeviceMouse0 CorePointer
InputDeviceKeyboard0 CoreKeyboard
EndSection
Section Files
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like .txt or .db). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
FontPath unix/:7100
EndSection
Section Module
Load dbe
Load extmod
Load fbdevhw
Load glx
Load record
Load freetype
Load type1
Load dri
EndSection
Section InputDevice
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option Xleds 1 2 3
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option XkbDisable
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option XkbModel pc102
# If you have a US Microsoft Natural keyboard, you can use:
# OptionXkbModel microsoft
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option XkbLayout de
# or:
# OptionXkbLayout de
# OptionXkbVariantnodeadkeys
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option XkbOptionsctrl:swapcaps
# Or if you just want both to be control, use:
# OptionXkbOptionsctrl:nocaps
#
Identifier Keyboard0
Driver kbd
OptionXkbModel pc105
OptionXkbLayout gb
EndSection
Section InputDevice
Identifier Mouse0
Driver mouse
OptionProtocol IMPS/2
OptionDevice /dev/input/mice
OptionZAxisMapping 4 5
OptionEmulate3Buttons yes
EndSection
Section Monitor
Identifier Monitor0
VendorName Monitor Vendor
ModelNameLCD Panel 1024x768
HorizSync31.5 - 48.5
VertRefresh 40.0 - 70.0
Optiondpms
EndSection
Section Device
# VendorName Videocard vendor
# BoardName VESA driver (generic)
Identifier Videocard0
Driver intel
BoardName Unknown video card
EndSection
Section Screen
Identifier Screen0
Device Videocard0
MonitorMonitor0
DefaultDepth 24
SubSection Display
Viewport 0 0
Depth 16
Modes800x600 640x480
