Can not set widescreen monitor to its native resolution.

[sweetrain]

I want to the setup my widescreen LCD monitor as my second monitor. Its native resolution is 1680x1050. But X always set it back to some lower resolution. the EDID info in /var/log/xorg.0.log are:

II) fglrx(0): Supported additional Video Mode:
(II) fglrx(0): clock: 146.2 MHz   Image Size:  433 x 271 mm
(II) fglrx(0): h_active: 1680  h_sync: 1784  h_sync_end 1960 h_blank_end 2240 h_border: 0
(II) fglrx(0): v_active: 1050  v_sync: 1053  v_sync_end 1059 v_blanking: 1089 v_border: 0
(II) fglrx(0): Ranges: V min: 56  V max: 77 Hz, H min: 31  H max: 84 kHz, PixClock max 170 MHz

The related sections in my xorg.conf is:

Section "Monitor"
        Identifier "Monitor2"
        Option "DPMS"
        ModeLine "1680x1050" 146.2 1680 1784 1960 2240 1050 1053 1059 1089
EndSection

Section "Screen"
        Identifier "Screen2"
        Device     "Videocard1"
        Monitor    "Monitor2"
        DefaultDepth     24
        SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1680x1050"
        EndSubSection
EndSection

I did some research. It seems this should work. But, still no luck.

I really appreciate some help here. Since I can't linux does not work with this new monitor, I have to switch back to win-xp for my work.

thanks in advance!

[leigh123linux]

have you installed 915resolution?

resolution modification tool for Intel graphic chipset
915resolution is a tool to modify the video BIOS of the 800
and 900 series Intel graphics chipsets. This includes the 845G,
855G, and 865G chipsets, as well as 915G, 915GM, and 945G chipsets.
This modification is necessary to allow the display of certain
graphics resolutions for an Xorg or XFree86 graphics server.

915resolution's modifications of the BIOS are transient.
There is no risk of permanent modification of the BIOS.
This also means that 915resolution must be run every time the
computer boots in order for its changes to take effect.
If you want to automatically set the resolution on each boot
and before X is launched, see /usr/share/doc/915resolution/README.Debian
for information about configuring the provided initscript.

Homepage: http://www.geocities.com/stomljen/

su -
yum install 915resolution

[sweetrain]

Thanks for the reply.
But my graphics card is not a intel one, it is an ATI X1300 mobile. Does 915resolution works on this too?

[leigh123linux]

Originally Posted by sweetrain

Thanks for the reply.
But my graphics card is not a intel one, it is an ATI X1300 mobile. Does 915resolution works on this too?

No just intel ( sorry I done a quick google on your sig ), have you installed fglrx ? (ati driver) and can you post your xorg.conf

[sweetrain]

I have fglrx installed from livna. And my xorg.conf is posted in a previous post on the same problem, and here it is:

# Xorg configuration created by livna-config-display

Section "ServerLayout"
        Identifier     "Default Layout"
        Screen      1  "Screen1" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Mouse0" "AlwaysCore"
EndSection

Section "Files"
        ModulePath   "/usr/lib/xorg/modules"
EndSection

Section "Module"
EndSection

Section "ServerFlags"
        Option      "AIGLX" "off"
EndSection

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

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/input/mice"
        Option      "EmulateWheel" "yes"
        Option      "EmulateWheelButton" "2"
        Option      "Emulate3Buttons" "yes"
        Option      "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
        Identifier "Monitor1"
        Option "DPMS" "true"
EndSection

Section "Monitor"
        Identifier "Monitor2"
        Option "DPMS" "true"
        Modeline "1680x1050" 170 1680 1784 1960 2240 1050 1053 1059 1089
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "fglrx"
        Option      "DPMS" "on"
        Option      "VideoOverlay" "on"
        Option      "DesktopSetup" "horizontal"
        Option      "ModeValidation" "NoMaxPCICheck"
        BusID       "PCI:1:0:0"
EndSection

Section "Device"
        Identifier  "Videocard1"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
        Screen      1
EndSection

Section "Screen"
        Identifier "Screen1"
        Device     "Videocard0"
        Monitor    "Monitor1"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes     "1024x768"
EndSubSection

EndSection

Section "Screen"
        Identifier "Screen2"
        Device     "Videocard1"
        Monitor    "Monitor2"
        DefaultDepth     24
        SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1680x1050"
        EndSubSection
EndSection
Section "Extensions"
        Option      "Composite" "Disable"
EndSection

[leigh123linux]

ok backup your old xorg.conf

su -
cp /etc/X11/xorg.conf /etc/X11/xorg.conf.123

then try this xorg.conf

Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "aticonfig-Screen[0]" 0 0
Screen "aticonfig-Screen[1]" RightOf "aticonfig-Screen[0]"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection


Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" IMPS/2"
Option "ZAxisMapping" "4 5"
Option "EmulateWheel" "yes"
Option "EmulateWheelButton" "2"
Option "Emulate3Buttons" "true"
EndSection


Section "Monitor"
Identifier "aticonfig-Monitor[0]"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection

Section "Monitor"
Identifier "aticonfig-Monitor[1]"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "false"
EndSection


Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
Option "DesktopSetup" "horizontal"
Option "VideoOverlay" "on"
BusID "PCI:1:0:0"
EndSection

Section "Device"
Identifier "aticonfig-Device[1]"
Driver "fglrx"
BusID "PCI:1:0:0"
Screen 1
EndSection


Section "Screen"
Identifier "aticonfig-Screen[0]"
Device "aticonfig-Device[0]"
Monitor "aticonfig-Monitor[0]"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "Screen"
Identifier "aticonfig-Screen[1]"
Device "aticonfig-Device[1]"
Monitor "aticonfig-Monitor[1]"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1680x1050" "1280x1024" "1024x768"
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection

Section "Extensions"
Option "Composite" "Disable"
EndSection

Section "ServerFlags"
Option "AIGLX" "off"
EndSection

restart X


if X fails copy the old xorg.conf back

su -
cp /etc/X11/xorg.conf.123 /etc/X11/xorg.conf

[sweetrain]

Thanks to leigh123@linux, the widescreen monitor can be set to 1680x1050. I added

Screen "aticonfig-Screen[1]" RightOf "aticonfig-Screen[0]"

to the server layout section, and removed the ModeLine in Mointor section.

However, this setup gives me to SEPERATE desktops. What would be even better to have a large desktop across to screens.

[leigh123linux]

try adding this line to this section

Option "Clone" "off"


i.e


Section "ServerLayout"
Identifier "Default Layout"
Screen 0 "aticonfig-Screen[0]" 0 0
Screen "aticonfig-Screen[1]" RightOf "aticonfig-Screen[0]"
Option "Clone" "off"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection

[sweetrain]

No Adding Option "clone" "Off" does not make it one large desktop. I still have two separate desktops.

[sweetrain]

Finally, I solved this problem. I found out that I only need one section of screen, monitor and device respectively. Attached my working dual monitor xorg.conf file

# Xorg configuration created by livna-config-display

Section "ServerLayout"
        Identifier     "Default Layout"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Mouse0" "AlwaysCore"
EndSection

Section "Files"
        ModulePath   "/usr/lib/xorg/modules"
EndSection

Section "Module"
EndSection

Section "ServerFlags"
        Option      "AIGLX" "off"
EndSection

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

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "IMPS/2"
        Option      "Device" "/dev/input/mice"
        Option      "EmulateWheel" "yes"
        Option      "EmulateWheelButton" "2"
        Option      "Emulate3Buttons" "yes"
        Option      "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
        Identifier "Monitor0"
        Option "DPMS" "true"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "fglrx"
        Option      "VideoOverlay" "on"
        Option      "DesktopSetup" "horizontal"
        BusID       "PCI:1:0:0"
        Screen      0
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes     "1680x1050" "1280x1024" "1024x768"
        EndSubSection
EndSection

Section "Extensions"
        Option      "Composite" "Disable"
EndSection