Suppressing automatic modes
Perry Hutchison
perryh at pluto.rain.com
Thu Aug 31 02:04:50 PDT 2006
> > Is there a way, short of rebuilding and/or hacking source, to turn
> > off some (or all) of the automatically-calculated resolutions, and
> > have the server use *only* those modelines explicitly provided
> > in xorg.conf? It looks as if an explicit modeline overrides any
> > automatic modes of the same name (resolution), but I have not yet
> > found a way to get rid of a resolution which I don't want to use
> > at all.
> >
> [snip highest mode is default mode]
>
> Hi Perry,
> Sounds like you've been trying to solve the wrong problem - you
> probably don't need any modelines. What you need is a "Modes"
> stanza in your Screen section stating the order in which you
> would like resolutions to be considered, as below:
>
> Section "Screen"
> Identifier "Screen0"
> Device "Card0"
> Monitor "Monitor0"
> DefaultDepth 24
> SubSection "Display"
> Depth 24
> Modes "1024x768" "800x600"
> EndSubSection
> EndSection
>
> Where the modes are read in order of precedence from left to
> right, and in the example above, "1024x768" would be the default
> resolution for the default depth of 24bpp.
Adding a Modes line made no difference. The resulting behavior
is the same as before, and the logfile is identical except for
the date stamp.
I suspect the cause is described in the last sentence of this
excerpt from the xorg.conf manpage:
Specifying video modes is optional because the server now
has a built-in list of VESA standard modes. When modes are
specified explicitly in the Monitor section (with the Modes,
ModeLine, or UseModes keywords), built-in modes with the same
names are not included. Built-in modes with different names
are, however, still implicitly included.
The question is, how do I go about eliminating some (or all) of
those built-in modes? Alternatively, how can I get the server to
believe the monitor's report of its supported modes? (The logfile
shows the monitor reporting 1024x768 as its highest resolution,
but the server nevertheless tries to use 1280x960.)
========================== new xorg.conf ==========================
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
ModulePath "/usr/X11R6/lib/modules"
FontPath "/usr/X11R6/lib/X11/fonts/misc/"
FontPath "/usr/X11R6/lib/X11/fonts/TTF/"
FontPath "/usr/X11R6/lib/X11/fonts/Type1/"
FontPath "/usr/X11R6/lib/X11/fonts/CID/"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection
Section "Module"
Load "dbe"
Load "dri"
Load "extmod"
Load "glx"
Load "record"
Load "xtrap"
Load "freetype"
Load "type1"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psm0"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
#DisplaySize 300 230 # mm
Identifier "Monitor0"
VendorName "GWY"
ModelName "FPD1530"
Option "DPMS"
ModeLine "1024x768" 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
ModeLine "832x624" 57.28 832 864 928 1152 624 625 628 667 -hsync -vsync
ModeLine "800x600" 36.00 800 824 896 1024 600 601 603 625 +hsync +vsync
ModeLine "640x480" 25.20 640 656 752 800 480 490 492 525 -hsync -vsync
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
### [arg]: arg optional
#Option "accel" # [<bool>]
#Option "crt_display" # [<bool>]
#Option "composite_sync" # [<bool>]
#Option "hw_cursor" # [<bool>]
#Option "linear" # [<bool>]
#Option "tv_out" # [<bool>]
#Option "tv_standard" # <str>
#Option "mmio_cache" # [<bool>]
#Option "test_mmio_cache" # [<bool>]
#Option "panel_display" # [<bool>]
#Option "probe_clocks" # [<bool>]
#Option "reference_clock" # <freq>
#Option "shadow_fb" # [<bool>]
#Option "sw_cursor" # [<bool>]
Identifier "Card0"
Driver "ati"
VendorName "ATI"
BoardName "3D Rage Pro AGP 1X/2X"
ChipSet "ati"
ChipId 0x4742
ChipRev 0x5c
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
SubSection "Display"
Viewport 0 0
Depth 1
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 4
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 8
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 15
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 16
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "DRI"
Group 0
EndSection
==========================
New logfile omitted to save on bandwidth, since except for the date
stamp it is identical to the previous one -- see the first post of
this thread.
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