Public bug reported:
Booting a ThinkPad T420s with discrete graphics enabled in the causes a
hang during the boot.
The hang happens somewhere during udev startup, I think.
As described in #1007138, adding pci=noacpi to the kernel command line
fixes the problem.
ProblemType: Bug
DistroRelease:
I might be able to set up a T420s that you can SSH into, if that helps?
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https://bugs.launchpad.net/bugs/1250027
Title:
10de:1056 [Lenovo ThinkPad T420s] Fails to boot
It did, as documented on #1007138. On older releases, the system would
sometimes boot and sometimes not. #1007138 mentions hanging 9 out of 10
times but I think on raring it hung something like 1 out of 4. This is,
of course, a very rough statistic.
On Saucy, it never seems to boot without
I think 12.10 was the first version I installed on this laptop.
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https://bugs.launchpad.net/bugs/1250027
Title:
10de:1056 [Lenovo ThinkPad T420s] Fails to boot using
Verified on Saucy with stock kernel and 3.12.0 mainline.
Booting with pci=noacpi works, hangs without.
** Tags added: kernel-bug-exists-upstream-3.12.0 saucy
** Tags removed: needs-upstream-testing
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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