Peter Laws composed on 2017-07-21 17:06 (UTC-0500):

> Pulling nomodeset gets me lots of stuff that looks exciting in
> Xorg.0.log but leaves me with a black display after spitting out the
> now-displayed boot messages (which go by far too quickly to read -
> maybe I'll video with my phone).

> Assuming that nomodeset really is what I want and that now I need to
> get the card configured for some mode I can see, how would I do that?

Assuming you are still stuck using the FBDEV driver, that can't happen. I really
don't think you have a TDE problem. The (EE) lines in Xorg.0.log seem to say you
have a CentOS/Xorg problem to solve. Once Xorg.0.log shows you are using
NVIDIA(0), NOUVEAU(0) or MODESET(0), TDM/TDE should start working as expected.

Your kernel in CentOS is actually older than 3.13 in 14.04LTS. Could it be that
the older CentOS 3.10 kernel and/or the CentOS nouveau and/or modeset drivers do
not support your M2000, maybe unless you install the proprietary NVidia driver?
Release announcement date for the M2000 isn't very different from kernel 3.11
release.

> I'm also seeing that tdm.log has unhappiness in it, namely:

> (==) Using system config directory "/usr/share/X11/xorg.conf.d"
> nvc0_screen_create:762 - Error allocating PGRAPH context for M2MF: -16
> EGL_MESA_drm_image required....

Is Mesa even installed?.

> I really regret dumping the Ubuntu 14.04LTS image that was
> pre-installed on this system because while not configured for TDE, it
> was driving the card/display correctly.  :-)

You need nomodeset gone from the default bootloader stanza for either the
nouveau or the modeset driver to work. To do that, assuming your installed
bootloader is grub2, that string needs to be removed from the
GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub, after which
/boot/grub/grub.cfg needs to be regenerated using grub-mkconfig.

However, that may need to wait until it can be determined why you get a black
screen when it is not used. When you reach the black screen after booting, can
you reach any of the vttys using Ctrl-Alt-Fn? If yes, then it can be removed now.

If your 14.04 was using the proprietary NVidia driver, then it's probably what
you want with CentOS too.

If you pastebin dmesg output and/or 'journalctl -b' output maybe someone can
spot the obstacle.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/