6600GT TwinView -- Resolution problem.

[cp1134]

Hello everyone,
So I decided to drop xinerama and use twinview. I believe I have everything setup
right, but I can't get identical resolutions on each monitor. I would like to have each
monitor run at 1680x1050 resolution. The first main monitor runs at that, but the second seems to run about 1300x1024. Is this a case of the 6600GT not supporting that high of a resolution on the second monitor? Here is my xorg.conf:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Wed Dec 14 16:39:22 PST
2005

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "/usr/X11R6/lib/X11/fonts/misc/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/misc/"
FontPath "/usr/X11R6/lib/X11/fonts/Type1/"
FontPath "/usr/X11R6/lib/X11/fonts/CID/"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/TTF/"
EndSection

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30.0 - 110.0
VertRefresh 50.0 - 150.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1680x1050"
EndSubSection
Option "TwinView"
#Option "SecondMonitorHorizSync" "30.0 - 83.0"
#Option "SecondMonitorVertRefresh" "56.0 - 75.0"
Option "SecondMonitorHorizSync" "30.0 - 110.0"
Option "SecondMonitorVertRefresh" "50.0 - 150.0"
Option "MetaModes" "1680x1050,1680x1050"
EndSection

Thanks,
Chris P.

[netllama]

Please startx with the following command:
startx -- -logverbose 5

and then generate and post a bug report.

Thanks,
Lonni

[cp1134]

Hi netllama,
Sorry about that. Attached is the bug report.

Thanks,
Chris P.

[netllama]

According to your bug report, you're getting 1680x1050 on both displays. Why do you believe that you're not?

-Lonni

[cp1134]

Because, for example if I have a 80x24 xterm on monitor 0 and then drag it to monitor 1 it is visibly larger. Also, If i take a window (say an xterm) and set it inbetween the two monitors then the left half of the window (on monitor 1) sets below the right half of the window (on monitor 2). Hmm I just tried to take a screenshot, but the disparity between the two is not visisble. Any suggestions would be appreciated.

Thanks,
Chris P.

[netllama]

If you run xdpyinfo on each display, what resolution does it claim you have?

-Lonni

[cp1134]

Output from each xdpyinfo done once per monitor.

From Monitor 0:

~ > xdpyinfo
name of display: :0.0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 60801000
X.Org version: 6.8.1
maximum request size: 16777212 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0xa0000e, revert to PointerRoot
number of extensions: 32
BIG-REQUESTS
DAMAGE
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
NV-CONTROL
NV-GLX
RANDR
RENDER
SECURITY
SHAPE
SYNC
TOG-CUP
X-Resource
XC-APPGROUP
XC-MISC
XFIXES
XFree86-Bigfont
XFree86-DGA
XFree86-Misc
XFree86-VidModeExtension
XINERAMA
XInputExtension
XKEYBOARD
XTEST
XVideo
XVideo-MotionCompensation
default screen number: 0
number of screens: 1

screen #0:
dimensions: 3360x1050 pixels (862x272 millimeters)
resolution: 99x98 dots per inch
depths (7): 24, 1, 4, 8, 15, 16, 32
root window id: 0x131
depth of root window: 24 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 256
preallocated pixels: black 0, white 16777215
options: backing-store NO, save-unders NO
largest cursor: 64x64
current input event mask: 0x5e0033
KeyPressMask KeyReleaseMask EnterWindowMask
LeaveWindowMask StructureNotifyMask ResizeRedirectMask
SubstructureNotifyMask SubstructureRedirectMask PropertyChangeMask
number of visuals: 80
default visual id: 0x21

From Monitor 1:

~ > xdpyinfo
name of display: :0.0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 60801000
X.Org version: 6.8.1
maximum request size: 16777212 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0xc0000e, revert to PointerRoot
number of extensions: 32
BIG-REQUESTS
DAMAGE
DOUBLE-BUFFER
DPMS
Extended-Visual-Information
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
NV-CONTROL
NV-GLX
RANDR
RENDER
SECURITY
SHAPE
SYNC
TOG-CUP
X-Resource
XC-APPGROUP
XC-MISC
XFIXES
XFree86-Bigfont
XFree86-DGA
XFree86-Misc
XFree86-VidModeExtension
XINERAMA
XInputExtension
XKEYBOARD
XTEST
XVideo
XVideo-MotionCompensation
default screen number: 0
number of screens: 1

screen #0:
dimensions: 3360x1050 pixels (862x272 millimeters)
resolution: 99x98 dots per inch
depths (7): 24, 1, 4, 8, 15, 16, 32
root window id: 0x131
depth of root window: 24 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x20
default number of colormap cells: 256
preallocated pixels: black 0, white 16777215
options: backing-store NO, save-unders NO
largest cursor: 64x64
current input event mask: 0x5e0033
KeyPressMask KeyReleaseMask EnterWindowMask
LeaveWindowMask StructureNotifyMask ResizeRedirectMask

Thanks,
Chris P.

[cp1134]

I thought I'd add a bit more info. I normally run E17 as my window manager, but I also checked in twm and this problem exists there as well. When I drag a window in E17 it will popup a little box showing the current x/y coordinate of the window as you move it. I notice that on Monitor 1 (the head that i believe is at the incorrect resolution) that in the upper left corner, which you would expect to have an x/y value of 0,0, is actually 264,0. Hopefully that might shed some light on the problem.

Thanks,
Chris P.

[netllama]

You're definitely getting 1680x1050, since 3360x1050 is 1680x1050 across two displays. I can't explain why you're seeing this behavior.

-Lonni

[cp1134]

Lonni,
I was experimenting and noticed that if i drop down to 1280x1024 (2560x1024) for each head the problem goes away. Would this have anything to do with the fact that my second head (monitor 1) is attached to a VGA style cable while the other head uses DVI?

Thanks,
Chris P