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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 99147
           Summary: xorg hangs at initial startup on linux-4.9.0
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: gleb at fastmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 128563
  --> https://bugs.freedesktop.org/attachment.cgi?id=128563&action=edit
nouveau

The issue start to appear after upgrading to Kernel 4.9.0. Before that, on
4.8.14 everything seems to be fine.

I have Lenovo B560 laptop with Intel Core i5 560M and Iron Lake GPU, Nvidia
310M, so it's an Optimus laptop. I have external monitor connected to HDMI
port.

Components when the probelm could be reproduced:
- gentoo almost stable
- mesa 12.0.1 or 13.0.2;
- libdrm 2.4.68 or 2.4.73
- xorg 1.18.4 or 1.19.0
- intel xf86 driver snapshot or modesetting driver
- nouveau 1.0.12 or 1.0.13
- libinput 1.5.3, libevdev 1.5.2
- xfce, polkit, consolekit, dbus, etc.


So just after all services started and lightdm expected to appear with login
screen, instead I can only see console login screen and nothing appears on tty7
also.

Xorg.log.0 shows no errors, dmesg is also empy (even with debug level 4). I
can't reboot system after that as Xorg has red D symbol and cannot be killed,
so SysRq is used.

I blacklisted nouveau driver and it helped, so I can boot to the system
normally and after that I can load the nouveau module manually and even restart
Xorg.

Xorg.log.0 hangs on the following item:
[    14.361] (II) xfree86: Adding drm device (/dev/dri/card1)

syslog kernel with nouveau filtered (only one time I enabled debug level when
the I had the problem).

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