I have the same issue on Dell Latitude D830 and external Dell 1908FPt connected
through a dock station.
With default X configuration (intel driver) the resolution is too high for the
monitor to handle and it does not
fall back automatically to maximum 1280x1024. When using vesa driver, max
resolution is detected fine.
I'm running daily updated Intrepid, starting with Beta release - and like
Anreas, I did not have this problem
with Hardy.
$ xrandr
Screen 0: minimum 640 x 480, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
1280x1024 0.0*
1024x768 0.0
800x600 0.0
640x480 0.0
$ sudo 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 300
VBE string at 0x11110 "Intel(r)GM965/PM965/GL960 Graphics Chip
Accelerated VGA BIOS"
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 supports 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 successful
parse-edid: EDID checksum passed.
# EDID version 1 revision 3
Section "Monitor"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
Identifier "DELL 1908FP"
VendorName "DEL"
ModelName "DELL 1908FP"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
HorizSync 30-81
VertRefresh 56-76
# Max dot clock (video bandwidth) 140 MHz
# DPMS capabilities: Active off:yes Suspend:yes Standby:yes
Mode "1280x1024" # vfreq 60.020Hz, hfreq 63.981kHz
DotClock 108.000000
HTimings 1280 1328 1440 1688
VTimings 1024 1025 1028 1066
Flags "+HSync" "+VSync"
EndMode
# Block type: 2:0 3:ff
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
EndSection
--
[regression] resolution detection fails with multiple displays connected
https://bugs.launchpad.net/bugs/249193
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