Nouveau - Mar 2014 - [Bug 76319] New: [NVE6] MMIO FAULT, black screen on K2100M

https://bugs.freedesktop.org/show_bug.cgi?id=76319

          Priority: medium
            Bug ID: 76319
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NVE6] MMIO FAULT, black screen on K2100M
        QA Contact: xorg-team at lists.x.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: d-bugzilla at moens.cc
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 95999
  --> https://bugs.freedesktop.org/attachment.cgi?id=95999&action=edit
# grep -n -i nouveau messages.out > messages.filtered

Experiencing a black screen when starting X on a Dell Precision M4800 QHD+
laptop (NVE6).
The internal screen size is 3200x1800 ; the DP-attached Dell UP2414Q measures
3840x2160.

The system is fully functional (ssh-enabled) and responds to VT switches
(CTRL-ALT-Fx), but all screens (X & VT) are black.

Sometimes (after a couple of minutes), I do notice a change in screen
brightness (power saving function ?).


- Fedora rawhide :
kernel-3.14.0-0.rc7.git0.1.fc21.x86_64
xorg-x11-server-Xorg-1.15.0-5.fc21.x86_64
xorg-x11-drv-nouveau-1.0.10-1.fc21.x86_64

- lscpi :
01:00.0 VGA compatible controller: NVIDIA Corporation GK106GLM [Quadro K2100M]
(rev a1)

- Kernel command line:
BOOT_IMAGE=/vmlinuz-rawhide-nouveau root=/dev/mapper/vg01-rootfs4 ro
rd.lvm.lv=vg01/rootfs4 vconsole.font=latarcyrheb-sun16 LANG=en_US.UTF-8
nouveau.debug=PDISP=debug,VBIOS=trace drm.debug=0xe

- Recompiled latest http://cgit.freedesktop.org/~darktama/nouveau/ as of
2014-03-18.



In the attached messages.filtered, X is started at line 1170.

As I am trying for several weeks now to get this system in a usable shape (Dell
disabled Optimus in the BIOS, and there are VT issues with the nVidia binary
blob), I am fully willing to recompile & test whatever you can possibly
throw
at me.

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D. Moens <d-bugzilla at moens.cc> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVE6] MMIO FAULT, black    |[NVE6] MMIO FAULT, black
                   |screen on K2100M            |screen on QHD+ K2100M

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I think you may be the proud owner of multiple issues, as evidenced by the gpu
lockup you get down the line.

First off, there's no way that load had those nouveau.debug settings. You
would
have seen a LOT more messages. I'm guessing you looked at some log file, and
that log file ignores debug-level messages. Try checking in dmesg directly.

Secondly, I'm pretty sure there's no way to achieve those resolutions
without
the 540MHz clock frequency provided for by DP1.2 (at least not with 24bit
color). In core/engine/disp/dport.c:nouveau_dp_train, prepend a 540000 value in
the first position of the bw_list array.

Try to get a full debug log (which should include the various DP debug
messages, as well as others), with that change, and the nouveau.debug settings
you were already using (but apparently were either not being picked up, or
something else).

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--- Comment #2 from D. Moens <d-bugzilla at moens.cc> ---
Ilia, thank you for your instantaneous reply.

(In reply to comment #1)
> I think you may be the proud owner of multiple issues, as evidenced by the
> gpu lockup you get down the line.
Thanks, I feel honoured.
> First off, there's no way that load had those nouveau.debug settings.
You
> would have seen a LOT more messages. I'm guessing you looked at some
log
> file, and that log file ignores debug-level messages. Try checking in dmesg
> directly.
Full dmesg (with patch applied) attached.

> 
> Secondly, I'm pretty sure there's no way to achieve those
resolutions
> without the 540MHz clock frequency provided for by DP1.2 (at least not with
> 24bit color). In core/engine/disp/dport.c:nouveau_dp_train, prepend a
540000
> value in the first position of the bw_list array.
Patched :

$ diff nouveau/nvkm/engine/disp/dport.c.orig nouveau/nvkm/engine/disp/dport.c
276c276
<     const u32 bw_list[] = { 270000, 162000, 0 };
---
> 	const u32 bw_list[] = { 540000, 270000, 162000, 0 };
> 
> Try to get a full debug log (which should include the various DP debug
> messages, as well as others), with that change, and the nouveau.debug
> settings you were already using (but apparently were either not being
picked
> up, or something else).
Oh joy, I now do get a graphical screen (and high-res VT).

Appearantly, I am also bitten by bug #70354 (witness errors.out) ?

Please find all logs in attachment (with external monitor detached, for sake of
simplicity).


Again, thank you for your involvement.
Didier

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D. Moens <d-bugzilla at moens.cc> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #95999|0                           |1
        is obsolete|                            |

--- Comment #3 from D. Moens <d-bugzilla at moens.cc> ---
Created attachment 96042
  --> https://bugs.freedesktop.org/attachment.cgi?id=96042&action=edit
# journalctl -b -k > dmesg.out

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--- Comment #4 from D. Moens <d-bugzilla at moens.cc> ---
Created attachment 96043
  --> https://bugs.freedesktop.org/attachment.cgi?id=96043&action=edit
# journalctl -b -p err > errors.out

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--- Comment #5 from D. Moens <d-bugzilla at moens.cc> ---
Created attachment 96044
  --> https://bugs.freedesktop.org/attachment.cgi?id=96044&action=edit
# journalctl -b /usr/bin/X > X.out

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--- Comment #6 from D. Moens <d-bugzilla at moens.cc> ---
Created attachment 96045
  --> https://bugs.freedesktop.org/attachment.cgi?id=96045&action=edit
# lspci -vv (limited to graphics adapter)

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--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #2)
> Patched :
> 
> $ diff nouveau/nvkm/engine/disp/dport.c.orig
nouveau/nvkm/engine/disp/dport.c
> 276c276
> < 	const u32 bw_list[] = { 270000, 162000, 0 };
> ---
> > 	const u32 bw_list[] = { 540000, 270000, 162000, 0 };
> 
> 
> Oh joy, I now do get a graphical screen (and high-res VT).
Great, so the display part of it is working? Image/resolution is all fine?
Could you also check with your external monitor? No one involved with nouveau
had such a screen, so we weren't sure it would work. I guess we can start
throwing that in when the HW supports it (hmmm... would have to figure out
which HW supports it...)
> 
> Appearantly, I am also bitten by bug #70354 (witness errors.out) ?
Hmmm, looks like it -- but if you're running darktama's latest repo, it
should
have a fix for that
(http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=39b5507a36f01dc920fd9d21a70aed62fe4c0fdf)

You could also try using blob pgraph fw, although that is not known to help
that issue.

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--- Comment #8 from D. Moens <d-bugzilla at moens.cc> ---
Report of current status ...


1. Code :


I've updated to darktama's latest git :
$ git log | head -n 1
commit e7cdcda87d2c2158ef34d88c9632bf7541c07c3a


2. Environment :


I'm now running on stock Fedora 20 (as it is not feasible to run Rawhide on
a
production system until the F21 release in october/november).

2a. With current kernel 3.13.6-200.fc20.x86_64, compilation halts at :
nouveau/drm/core/subdev/mxm/base.c: In function ?mxm_shadow_dsm?:
nouveau/drm/core/subdev/mxm/base.c:109:2: error: implicit declaration of
function ?acpi_evaluate_dsm? [-Werror=implicit-function-declaration]
  obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4);

2b. For now, upgrading to 3.14.0-0.rc7.git0.1.fc20.x86_64 (backported FC20 rpms
are provided at
http://copr-be.cloud.fedoraproject.org/results/besser82/kernel-backport/fedora-20-x86_64/kernel-3.14.0-0.rc7.git0.1.fc21/).
Current git compiles fine with 3.14rc7.


3. Issues :


3a. Sometimes (30-50% of the cases ? not conclusive, not enough iterations) the
kernel completely halts when loading the nouveau module (CAPSLOCK led
responds). Cold restart needed ;

3b. The 540MHz patch in 'core/engine/disp/dport.c:nouveau_dp_train' is
appearantly still required ;

3c. MMIO FAULT / HUB_INIT timeouts still occur, cfr. attachment errors2.out .

3d. Power saving (DPMS ?) : when returning from DPMS, only the mouse pointer is
shown on an otherwise (dark grey) lit screen ;

3e. Suspend : after resume, display is not restored, only a black screen is
shown.


4. Preliminary conclusion :

Otherwise, everything appears to work very well (X & VT), in full resolution
and with the external monitor attached (single/cloned/extended displays).
I can live with the troublesome suspend, but failing DPMS is a deal-breaker for
production use.

Not tested :
- thermal power management (fans?) ;
- performance metrics.


5. Further testing :

Due to the missing Optimus & other nVidia issues, I'm currently still
running
the M4800 next to my aging production system (M6600), but planning to migrate
in the near future.
If you'd like me to test new code, performance, ... on a NVE6 with QHD+/DP
for
the next days, this would be the time to go ahead.

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--- Comment #9 from D. Moens <d-bugzilla at moens.cc> ---
Created attachment 96094
  --> https://bugs.freedesktop.org/attachment.cgi?id=96094&action=edit
errors2.out

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D. Moens <d-bugzilla at moens.cc> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #10 from D. Moens <d-bugzilla at moens.cc> ---
As the crux of this bug (black screen) has been resolved, I'm closing this
bug.

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--- Comment #11 from Andrew G. Dunn <andrew.g.dunn at gmail.com> ---
Did other bugs get created from this report? Comment 1 indicated there were
many issues.

Are you now using F20 with the rawhide kernel?

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--- Comment #12 from D. Moens <d-bugzilla at moens.cc> ---
I did file bug 76585 and 76990 too.

As there was no reply (no hard feelings) to my invitation for further
testing/developing (comment #8, paragraph 5), I have currently fallen back to
the nvidia binary blob.


Binary blob advantages (tested) :
- suspend/resume works

BB possible advantages (not tested) :
- performance
- stability

BB disadvantages :
- closed source
- no display in VT's
- switching between VT's required to restore screen display after screen
power
off
- closed source

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