[Bug 34462] 180 second hang on boot, DRM doesn't seem to initialize (firmware issue?)

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https://bugs.freedesktop.org/show_bug.cgi?id=34462

--- Comment #6 from Jonathan Nieder <jrnieder@xxxxxxxxx> 2011-12-03 00:16:17 PST ---
Owen, can you bisect?

Just trying a few intermediate versions from http://snapshot.debian.org/ would
already be useful.  For narrowing down the regression range beyond that, "git
bisect" can help:

 git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
 cd linux
 git bisect start -- drivers/gpu/drm/radeon
 git checkout (bad version)
 make localmodconfig; # minimal configuration
 make -j2 deb-pkg
 dpkg -i ../(package).deb
 reboot
 # confirm that it is actually bad
 git bisect bad

 git checkout (good version)
 make silentoldconfig; # reuse configuration
 make -j2 deb-pkg
 dpkg -i ../(package).deb
 reboot
 # confirm that it is good
 git bisect good

 # now it checks out an intermediate version to test
 make silentoldconfig
 make -j2 deb-pkg
 dpkg -i ../(package).deb
 reboot
 git bisect bad; # if it hangs in the same way
 git bisect good; # if it boots correctly
 git bisect skip; # if some other problem makes it hard to test

 ... rinse and repeat ...

 git bisect visualize; # to watch the regression range narrowing
 git bisect log; # to summarize partial results if you get bored

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