[gentoo-desktop] MacBook Intel GMA950 w/ Dell 2407WFP monitor - display problems

[Joe]

I'm experiencing some display problems when using the latest version  
of X.org on Gentoo with my MacBook. I've followed the Gentoo-MacBook  
Wiki Talk page on how to get DRM working by compiling the kernel  
without DRM support, and then installing x11-drm with portage. I've  
also installed the xf86-video-i810 driver, and I must have done  
something right, because glxinfo reports direct rendering as on. But  
that's one of the few things that /is/ working correctly. Here are  
the relevant sections of my xorg.conf file:

Section "Device"
         Identifier      "Built-in Device"
         Driver          "i810"
         Screen          0
         Option          "MonitorLayout" "CRT,LFP"
         BusID           "PCI:0:2:0"
EndSection

Section "Device"
         Identifier      "External Device"
         Driver          "i810"
         Screen          1
         Option          "MonitorLayout" "CRT,LFP"
         #BusID           "PCI:0:2:0"
         BusID           "PCI:0:2:1"
EndSection

Section "Monitor"
         Identifier      "Built-in Monitor"
         Option          "DPMS"
         HorizSync       28-64
         VertRefresh     43-60
EndSection

Section "Monitor"
         Identifier      "External Monitor"
	VendorName	"DEL"
	ModelName	"DELL 2407WFP"
         Option          "DPMS"
         HorizSync       30.0-83.0
         VertRefresh     56.0-76.0
EndSection

Section "Screen"
         Identifier      "Built-in Screen"
         Device          "Built-in Device"
         Monitor         "Built-in Monitor"
         DefaultDepth    24
         SubSection "Display"
                 Depth           24
                 Modes           "1280x800" "1024x768" "800x600"
         EndSubSection
EndSection

Section "Screen"
         Identifier      "External Screen"
         Device          "External Device"
         Monitor         "External Monitor"
         DefaultDepth    24
         SubSection "Display"
                 Depth           24
                 Modes           "1920x1200" "1600x1200" "1680x1050"  
"1024x768" "800x600"
         EndSubSection
EndSection

Section "ServerLayout"
         Identifier "Dual Layout"
         Screen 0 "Built-in Screen"
         Screen 1 "External Screen" Above "Built-in Screen"

         Option "Clone" "On"
         #Option "Xinerama" "On"

         InputDevice "Generic Keyboard"
	InputDevice "Configured Mouse"
EndSection

When I start X using this configuration, I get the following output:

X Window System Version 1.3.0
Release Date: 19 April 2007
X Protocol Version 11, Revision 0, Release 1.3
Build Operating System: UNKNOWN
Current Operating System: Linux localhost 2.6.22-gentoo-r9-mactel #4  
SMP PREEMPT Sat Dec 1 04:56:41 PST 2007 i686
Build Date: 28 November 2007
         Before reporting problems, check http://wiki.x.org
         to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
         (++) from command line, (!!) notice, (II) informational,
         (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Dec  1 21:34:48 2007
(==) Using config file: "/etc/X11/xorg.conf"
(WW) intel: No matching Device section for instance (BusID PCI:0:2:1)  
found
(II) Module already built-in
(II) Module already built-in
(II) Module already built-in
Could not init font path element /usr/share/fonts/TTF/, removing from  
list!
Could not init font path element /usr/share/fonts/OTF, removing from  
list!

X displays on both monitors in clone mode, with my built-in screen at  
1280x800, while my external monitor is at some really low resolution  
(I'm not exactly sure, but it's probably somewhere around 1024x768).  
And that's my main problem: no matter what resolutions I enter into  
my xorg.conf file, my monitors don't change their resolutions (even  
if I put 640x480 as the only option). In fact, I get the same result  
if I don't use any xorg.conf file at all.

Using xrandr is bit more promising. Running it without any arguments  
produces the following output:
Screen 0: minimum 320 x 200, current 1280 x 864, maximum 1920 x 1920
VGA disconnected (normal left inverted right)
LVDS connected 1280x800+0+0 (normal left inverted right) 286mm x 178mm
    1280x800       59.9*+
    1024x768       60.0
    800x600        60.3
    640x480        59.9
TMDS-1 connected 1152x864+0+0 (normal left inverted right) 0mm x 0mm
    1920x1200      60.0 +
    1600x1200      59.9
    1680x1050      60.0
    1280x1024      75.0     59.9
    1152x864       74.8*
    1024x768       75.1     60.0
    800x600        75.0     60.3
    640x480        75.0     60.0     59.9
    720x400        70.1

I can successfully change my resolution on the Dell monitor to  
1680x1050 -- definitely an improvement. But when I try to change to  
1920x1200 or 1600x1200, my monitor goes blank, and then displays the  
following:
"Out of range signal.
Cannot display this video mode,
change computer display input to 1920x1200 @ 60Hz"

Those display modes work fine on OS X and Windows XP, so there's  
nothing wrong with the monitor or graphics card. I'm really a newbie  
in this stuff, so yeah... I would appreciate any help on this. Thanks  
in advance.
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