[Nouveau] Nouveau module X server not starting on a NP900X5N Kaby Lake machine

[Jan Vlietland]

Hi Ilia, many thanks for answering my mail.

Tonight I tried to see what happens if I generate a xorg.conf file and place it in /etc/X11/xorg.conf, as described here:
https://askubuntu.com/questions/4662/where-is-the-x-org-config-file-how-do-i-configure-x-there

When I do that X starts without the framebuffer error. X starts with a backtrace list in the shell and then stops with the error:

'Segmentation fault at address 0x0.

Fatal sever error etc etc etc.

Hope this helps!

In fact the above is part of a much bigger issue I have with the 
machine. When I enable the i915 module (Kaby lake native video) my 
screen goed black after a while. The machine is totally stuck in that 
state. Even ssh connection is not possible. It shows no errors in the 
(saved) logs after restarting the machine.

So I disabled the i915 module and try to get the nvidia card running. 
Without any luck.

Thank you for inviting me for irc.freenode.net. What it the procss to 
get access?

I have included the full dmesg in zip format.

For me it is a showstopper using the machine with Linux. I really do not 
understand that I am the only person on this planet that cannot run 
Linux on a plain vanilla Kaby lake machine.


On 01-01-19 22:23, Ilia Mirkin wrote:
> On Tue, Jan 1, 2019 at 4:06 PM Jan Vlietland <j.vlietland at nisi.nl> wrote:
>> Hi Ben, David and Daniel ,
>>
>> First of all happy new year. Based on advice of Greg K-H herewith a mail
>> about a number of Nouveau issues with my laptop.
>>
>> I installed various Kali linux versions up to Linux 4.20.0-rc7
>> (downloaded, compiled and installed) on a Samsung NP900X5N laptop and
>> have an issue with the driver after loading.
>>
>> My configuration:
>>
>> - i7 7500
>> - 16 gb / 256 gb ssd
>> - nvidia 940MX (for 3D graphics)
>>
>> When I enable loading of the nouveau module for my Nvidia 3D card I get
>> three MMIO faults:
>>
>> [   35.984104] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 [ IBUS ]
>> [   35.997510] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 10ac08 [ IBUS ]
>> [   37.551790] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 619444 [ IBUS ]
>>
>> I see currenty varous discussions on bugzilla: (as summarized by Bruno
>> Pagani) https://bugs.freedesktop.org/show_bug.cgi?id=100423.
>>
>> But I do not see any confirmed solutions on the MMIO faults.
>>
>> The module is loaded but X server cannot run in framebuffer mode. I
>> assume that the module does not provide any video memory to X to run in
>> graphics mode.
>>
>> First of all I would like to understand what the faults impose.
>> And I also would like to help you providing testing to fix the errors.
> The faults are, generally, nothing to worry about, esp if they occur
> infrequently. It's one bit or another of code that's poking at a part
> of the GPU it shouldn't be touching.
>
> To the best of my knowledge, 940MX (GM108) should work reasonably
> well. Perhaps it would make most sense if you posted about some of
> your other issues (usually GM108's are have no outputs, so only usable
> as offload devices). Feel free to join #nouveau on irc.freenode.net to
> get more info as well.
>
> Cheers,
>
>    -ilia
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