Cannot set resolution 1680x1050 for Intel 915

[Bing Ho]

Hello,

I just installed Ubuntu Dapper Drake Flight 5 (kernel 2.6.15), with X11R7.0 and have been unable to get a custom resolution of 1680 x 1050 using embedded Intel 915G video. I am using a Dell Optiplex with 915G which uses a PCI Express riser card with a Silicon Image TMDS transmitter for the DVI connection to a Philips 20" WXGA 1680x1050 native resolution LCD monitor.

I've read through the mailing list for the last few months and have tried some of the solutions posted, but they don't seem to work. I am end up with the detected resolution of 1600x1200 no matter what I do.

I have turned off DDC support, used a custom modeline, and tried a vBIOS hack 915resolution (as well as combinations of those three), without any success.

Here are the excerpts of my xorg.conf and Xorg.0.log. I'm a newbie, and the mailing list replies weren't too clear about this,  so I tried the following commands and locations in xorg.conf.

In Section "Device", "Monitor", and "Screen"
Option "NoDDC"
or
Option "NoDDC" "on"
or
Option "NoDDC" "true"

I also tried in the same three sections,
Option "IgnoreEDID" "true"
Option "DDC" "false"
Xorg.0.log seemed to indicated the IgnoreEDID and DDC were ignored.

I have used 915resolution and started it a daemon, with modes 3a (normally 1600x1200) and 3c (normally 1920x1440) overwritten at all color bit depths as 1680x1050. As you can see from the last excerpt of my Xorg.0.log, modes 3a and 3c are not properly detected.

I am out of ideas about what to do and would appreciate any advice. I have not updated or installed any drivers that differ from the default installation.

Thank you,
Bing


Excerpt of xorg.conf
Section "Device"
    Identifier    "Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller"
    Driver        "i810"
    BusID        "PCI:0:2:0"
    VideoRam    131072
EndSection
Section "Monitor"
    Identifier    "Philips 200W"
    Option        "DPMS"
    HorizSync    30-93
    VertRefresh    56-85
    DisplaySize    433 271
    Modeline    "1680x1050" 146 1680 1784 1960 2240 1050 1053 1059 1089
EndSection
Section "Screen"
    Option          "NoDDC"
    Identifier    "Default Screen"
    Device        "Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller"
    Monitor        "Philips 200W"
    DefaultDepth    24
    SubSection "Display"
        Depth        1
        Modes        "1680x1050" "1280x1024" "1280x960" "1280x768" "1152x864" "1024x768" "800x600" "640x480"
    EndSubSection


And here is an excert of my Xorg.0.log
more /var/log/Xorg.0.log | grep 'ddc'
(II) LoadModule: "ddc"
(II) Loading /usr/lib/xorg/modules/libddc.so
(II) Module ddc: vendor="X.Org Foundation"
(II) Loading sub module "ddc"
(II) LoadModule: "ddc"
(II) Reloading /usr/lib/xorg/modules/libddc.so
more /var/log/Xorg.0.log | grep 'NoDDC'
(**) I810(0): Option "NoDDC"
more /var/log/Xorg.0.log | grep '1680'
(II) I810(0): Not using mode "1680x1050" (no mode of this name)
more /var/log/Xorg.0.log | grep 'Mode: 3'
Mode: 30 (640x480)
Mode: 32 (800x600)
Mode: 34 (1024x768)
Mode: 38 (1280x1024)
Mode: 3a (0x0)
Mode: 3c (0x0)


		
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