Xorg ignores xorg.conf modes after update

[selig]

I have updated my system and Xorg got updated too (to version 1.15.0). Now it ignores the modes I set in xorg.conf for some reason:

xorg.conf:

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Section "Screen"
        Identifier "screen1"
        Device     "device1"
        Monitor    "monitor1"
        DefaultDepth     24
        SubSection "Display"
                Depth     24
                Modes    "1280x800"
        EndSubSection
EndSection

When it starts up with KDM, it keeps using the resolution from kernel framebuffer, which I set to 1024x768.

Xorg.0.log:

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[    41.293] (--) intel(0): Output LVDS1 using initial mode 1024x768 on pipe 0
[    41.527] (II) intel(0): switch to mode 1024x768@60.0 on pipe 0 using LVDS1, position (0, 0), rotation normal

After I log in, I can change the resolution using KDE settings but of course those are only valid for the user after logging in. I am not sure what changed and how to tell Xorg to use 1280x800 by default. Any tips would be appreciated.

[chithanh]

The screen section is part of the legacy configuration.

Modern xorg uses a monitor section like this:

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Section "Monitor"
        Identifier "LVDS1"
        Option "PreferredMode" "1280x800"
EndSection