Tools report that EDID fail.
However the monitor works perfectly tough. Even without any Xorg config file, 
it gets auto-detected correctly.

Samsung SyncMaster 2493HM (connected straight via DVI to Gainward GeForce 
8600GT)
Ubuntu 8.10 Intrepid Ibex (alpha)
kernel: 2.6.27-2-generic
xorg: 1:7.4~1ubuntu1
xserver-xorg-core                                     2:1.4.99.906-2ubuntu5

--
$ sudo ddcprobe 
vbe: VESA 3.0 detected.
oem: NVIDIA
vendor: NVIDIA Corporation
product: GW-P/[EMAIL PROTECTED]:0 [EMAIL PROTECTED] �
memory: 14336kb
mode: 640x400x256
mode: 640x480x256
mode: 800x600x16
mode: 800x600x256
mode: 1024x768x16
mode: 1024x768x256
mode: 1280x1024x16
mode: 1280x1024x256
mode: 320x200x64k
mode: 320x200x16m
mode: 640x480x64k
mode: 640x480x16m
mode: 800x600x64k
mode: 800x600x16m
mode: 1024x768x64k
mode: 1024x768x16m
mode: 1280x1024x64k
mode: 1280x1024x16m
edid: 
edidfail
--
$ sudo get-edid > edid.dat
get-edid: get-edid version 1.4.1

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
        Function supported
        Call successful

        VBE version 300
        VBE string at 0x11110 "NVIDIA"

VBE/DDC service about to be called
        Report DDC capabilities

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
        Function supported
        Call successful

        Monitor and video card combination does not support DDC1 transfers
        Monitor and video card combination does not support DDC2 transfers
        0 seconds per 128 byte EDID block transfer
        Screen is not blanked during DDC transfer

Reading next EDID block

VBE/DDC service about to be called
        Read EDID

        Performing real mode VBE call
        Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
        Function supported
        Call failed

The EDID data should not be trusted as the VBE call failed
Error: output block unchanged
--

-- 
EDID fail
https://bugs.launchpad.net/bugs/194760
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