[Bug 285572] [NEW] X freezes right after login when using EXA on G45 machine

[mnemo]

Public bug reported:

So my machine with intel chipset G45 (motherboard is Gigabyte GA-EG45M-
DS2H) freezes right after boot when X.org runs in EXA mode. Upstream
have now provided a fix for this and the bug was in intel-agp.ko.
Further I have tried to apply this patch to the intrepid kernel and it
works, I can login without any hacks in xorg.conf, and I get direct
direct rendering etc.

The patch that made it work was:
http://git.kernel.org/?p=linux/kernel/git/anholt/drm-intel.git;a=blobdiff;f=drivers/char/agp/intel-agp.c;h=f1fe7490131468b40c5817e232442026d9f8ff0d;hp=016fdf0623a4ce7b5f849efc8ab099a2c5026497;hb=2052746fc8397130c120f0194a89938b0b62b6cb;hpb=b34c87315b1a2822111fc8ef744ef504f9be2f85

Even though is pretty late in the game I think this patch should be
considered for cherry picking into intrepid. Personally I will run the
git versions anyway but a lot of new users with modern intel machines
might not be able to do that.

Note:
1) This patch is very small
2) This patch is essentially says "if card is Gx5 then do blah" so it's lower than usual risk

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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X freezes right after login when using EXA on G45 machine
https://bugs.launchpad.net/bugs/285572
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