[Nouveau] [Bug 99147] xorg hangs at initial startup on linux-4.9.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99147

--- Comment #8 from Gleb <gleb at fastmail.com> ---
Created attachment 128590
  --> https://bugs.freedesktop.org/attachment.cgi?id=128590&action=edit
1st attempt: before lscpi

TL;DR `lspci` hangs on first invocation

I tried few more things, step by step:
1) removed kernel 4.9.0, modules, config, etc
2) tried 4.8.15 -- everything is fine, no hanging
3) installed 4.9.0 from scratch:
- redownloaded sources (gentoo-sources)
- copied old config from 4.8.{14,15}, so nouveau built as external module
- make silentoldconfig, for everything new I just press <enter>
- built, installed the kernel as did it before with the same steps

Conclusion:
- 4.8.14 -- OK
- 4.8.15 -- OK
- 4.9.0 -- fail (xorg hangs)

Then I tired suggested steps:
- disabled xdm, system boots to text console
- in 2nd attempt additionally disabled libvirtd

In both cases `lspci` just hangs without any output with red D status. At first
attempt libvirtd also was with red D status, at second there wasn't libvirtd
started.

Userspace stuff with for all actions was the same:
- mesa-13.0.2
- libdrm-2.4.74
- xorg-1.19.0
- xf86-video-intel (snapshot from 12 December 2016)
- xf86-video-nouveau-1.0.13
- libinput-1.5.3
- libevdev 1.5.2

dmesg attached, with "drm.debug=0x1e log_buf_len=1M", two attemps with 2 log
files (before invoking lspci and after).

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