i915 trouble -- IRQ being disabled

[Dominik B. <li...@do...>]

Hi,

When I switch from the "X Window System Version 7.1.1" console to a
terminal, IRQ 10:

 10:     200000    XT-PIC-XT        uhci_hcd:usb1, ehci_hcd:usb4, yenta, yenta, i915@pci:0000:00:02.0

gets disabled (irq 10: nobody cared). The hardware is

00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)

and I was able to "git bisect" it down to the drm patches which went in
after 2.6.19 and before 2.6.19-rc1 got released.

While I have some other issues related to that IRQ line (usb autosuspend
can causes the IRQ 10 becoming disabled, too), this issue only appeared once
the drm/i915 patches got merged, so I logically derive that this is a
separate issue.

Any ideas? Any debugging you want me to do?

	Dominik