Bug#808700: nouveau: sometimes fails to initialize DisplayPort monitor during boot (link training failed)

[Sven Joachim <svenjoac@gmx.de>]

On 2015-12-21 21:47 +0100, Jerry wrote:

> Package: xserver-xorg-video-nouveau
> Version: 1:1.0.12-1
> Severity: important
> File: nouveau
>
> Dear Maintainer,

There is no maintainer, FWIW[1,2]. :-(

> Sometimes, during boot, the system will fail to initialize one of my monitors.
> Whenever this problem occurs, it always impacts the same monitor. This monitor
> is connected to the GPU via DisplayPort, while the other two monitors are
> connected via DVI.
> Then this problem occurs, I can see a message stating "link training failed"
> for a short time, before the system continues the boot process by starting
> lightdm.

That's a kernel bug.

> -- System Information:
> Debian Release: stretch/sid
>   APT prefers unstable
>   APT policy: (500, 'unstable')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
>
> Kernel: Linux 4.3.0-1-amd64 (SMP w/8 CPU cores)

Please try Linux 4.4.0-rc5 from experimental, and if that does not help,
file a bug upstream.  See http://nouveau.freedesktop.org/wiki/Bugs/ for
instructions.

Cheers,
       Sven


1. https://tracker.debian.org/news/732335
2. https://lintian.debian.org/maintainer/debian-x@lists.debian.org.html#xserver-xorg-video-nouveau