Regression: DVI monitor "not connected" after drm starts at bootup on kernel 2.6.35-7

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Hello dri-devels,

I'm running a Slackware64-current setup and updated it to use the 2.6.35 kernel.
On the next reboot my monitor went dark and into "power-saving mode" when drm started at boot.
The screen remains on until that moment, so i still have vision of all the debug output the kernel throws at bootup before drm starts.
The same setup worked on slackware64-current with the 2.6.33 kernel.

Hardware used:
A monitor connected to DVI. Physical setup didn't change.

Monitor information from Xorg.0.log:
(II) intel(0): EDID vendor "GSM", prod id 22136
(II) intel(0): Using EDID range info for horizontal sync
(II) intel(0): Using EDID range info for vertical refresh
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1680x1050"x0.0  119.00  1680 1728 1760 1840  1050 1053 1059 1080 +hsync -vsync (64.7 kHz)
... some more modelines ...
(II) intel(0): Modeline "1280x960"x0.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz)

lspci output:
- 00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 10)
- 00:02.1 Display controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 10)

Last working setup:
- Distro Slackware64-current
- Xorg 1.7
- Kernel 2.6.33.4 (from distro)

Display showed in xrandr up as connected and is working properly.

Tested setups that were broken:
- Distro: Slackware64-current
- Xorg 1.7
- Kernel 2.6.35-7 (from distro)

- Distro: Slackware64-current
- Xorg 1.7
- Kernel 2.6.36-rc8 (custom compile)

- Distro: Ubuntu Linux (x64)
- Xorg 1.9
- Kernel 2.6.35-7 (from distro)

In all the broken setups the dvi-connected display switches off just after drm is loaded at bootup. VGA works fine.
xrandr -q tells me the dvi display is not connected.

Thanks in advance,
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