[Bug 91952] [Bisected Regression] Blank screen from boot until any input on X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91952

--- Comment #5 from João Paulo Rechi Vita <jprvita at gmail.com> ---
I think the problem behind this bug is some kind of race condition, due to how
hard it is to reproduce, and to the fact that this unrelated patch [1] that
affects the kernel boot time mitigates the symptoms:

author    Andy Whitcroft <apw at canonical.com>    2009-12-02 14:41:53 (GMT)
committer    Tim Gardner <tim.gardner at canonical.com>    2015-08-31 00:32:13
(GMT)
commit    2015a241030e89920d7d3613a81c30c36e7f11ac (patch)
tree    3d515264f0d291a6f83410e3f7421055eb1d26aa
parent    366eebd045e55262304d45c138bdcca004726c55 (diff)
UBUNTU: SAUCE: isapnp_init: make isa PNP scans occur async
The results of scanning for devices is to trigger udev events therefore
we can push this processing async.

This reduces kernel initialisation time (the time from bootloader to
starting userspace) by several 10ths of a second x86 32bit systems.

Signed-off-by: Andy Whitcroft <apw at canonical.com>
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>


So I'm not sure if this is actually fixed in intel-drm-nightly or if it has a
different timing that does not trigger the problem. In any case, it would be
nice to have a fix for stable.

[1]
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/wily/commit/?id=2015a241030e89920d7d3613a81c30c36e7f11ac

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