[Bug 440411] Re: spam of change events from drm/card0

[Mikko Rantalainen]

The patch http://bugzilla.kernel.org/attachment.cgi?id=24339 contains
the code that can be removed in case BIOS is not used for the VBT setup.
This code has been currently dropped from the vanilla kernel, if I've
understood correctly. I think the best fix would be to keep this code
but to skip VBT of it if a known bad BIOS is detected.

If I'm reading the code correctly, then both dp_is_present_in_vbt() and
hdmi_is_present_in_vbt() should be modified to always return 1 in case
of a known broken BIOS. It could be wise to add a kernel flag to allow
forcing the BIOS as broken to have a quick fix for a BIOS that is later
found to be broken (such a flag could be used until the kernel is
teached about such BIOS).

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spam of change events from drm/card0
https://bugs.launchpad.net/bugs/440411
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