Option "NoDDC" worked in the monitor section of xorg.conf. (Option
"noDDCvbe" just made things worse.)
m...@ubuntu:~$ sudo time ddcprobe
Calling INT 0x42 (F000:F065)
EAX is 0xBD50
vbe: VESA 2.0 detected.
oem: Matrox Graphics Inc.
memory: 8192kb
mode: 640x400x256
mode: 640x480x256
mode: 800x600x16
mode: 800x600x256
mode: 1024x768x256
mode: 1280x1024x256
mode: 80x60 (text)
mode: 132x25 (text)
mode: 132x43 (text)
mode: 132x50 (text)
mode: 132x60 (text)
mode: 640x480x32k
mode: 640x480x64k
mode: 640x480x16m
mode: 800x600x32k
mode: 800x600x64k
mode: 800x600x16m
mode: 1024x768x32k
mode: 1024x768x64k
mode: 1024x768x16m
mode: 1280x1024x32k
mode: 1280x1024x64k
edid:
edidfail
0.27user 1.04system 0:01.50elapsed 87%CPU (0avgtext+0avgdata 0maxresident)k
48inputs+0outputs (1major+161minor)pagefaults 0swaps
m...@ubuntu:~$ sudo time get-edid|parse-edid
parse-edid: parse-edid version 1.4.1
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 200
VBE string at 0xc7300 "Matrox Graphics Inc."
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
Command exited with non-zero status 1
0.20user 1.10system 0:01.74elapsed 75%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+143minor)pagefaults 0swaps
parse-edid: IO error reading EDID
--
Can not get 1024x768 video mode by undetected monitor and Matrox G100 8MB
graphics adapter
https://bugs.launchpad.net/bugs/319363
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