[Bug 31527] DRI locks up the machine when starting X on a Radeon 9250

[ath]

Public bug report changed:
https://launchpad.net/malone/bugs/31527

Comment:
The problem is still present in Dapper as of 2006-03-26. Breezy doesn't have any problem running on the same machine, and I've found that mainline 2.6.15.6 works correctly.

Applying the patch from http://www.kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=392c14beaca2ee85a98d0c6b453501be67423a20 (which reverts a previous buggy DRM change) on a rebuilt Dapper 2.6.15-19 kernel fixes the problem.

Quoting the patch comment: "It fixed some machines, but seems to continually interact badly with some X versions. [...] So I think at this point, the best is that we keep the old bogus code that at least is consistent with the bug in the server."

This patch is included in the mainline 2.6.15 kernel. Why isn't applied in Dapper's one?