Nouveau - Mar 2015 - [Bug 89483] New: Hangs on boot with external monitor active on Dell Latitude C810

https://bugs.freedesktop.org/show_bug.cgi?id=89483

            Bug ID: 89483
           Summary: Hangs on boot with external monitor active on Dell
                    Latitude C810
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: linux at rainbow-software.org
        QA Contact: xorg-team at lists.x.org

Created attachment 114114
  --> https://bugs.freedesktop.org/attachment.cgi?id=114114&action=edit
netconsole log from nouveau before hang

Nouveau works fine on Dell Latitude C810 (GeForce2 Go) if no external monitor
is connected and also when an external monitor is connected but not enabled
before booting Linux.

However, when the external monitor is enabled (internal LCD is automatically
disabled - seems that the BIOS does not support clone mode), machine hangs
during nouveau initialization.

The weird thing is that when the monitors are switched using Fn+F8 before boot
(doesn't matter which one is kept enabled), nouveau does not hang.

The same thing happens with Debian Wheezy default 3.2 kernel and also 3.16
kernel from backports.

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--- Comment #1 from Ondrej Zary <linux at rainbow-software.org> ---
Created attachment 114115
  --> https://bugs.freedesktop.org/attachment.cgi?id=114115&action=edit
netconsole log from nouveau when it works

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https://bugs.freedesktop.org/show_bug.cgi?id=89483

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Hangs on boot with external |[NV11] Hangs on boot with
                   |monitor active on Dell      |external monitor active on
                   |Latitude C810               |Dell Latitude C810

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Could you do the problematic boot with

nouveau.debug=trace

I assume that the nouveau messages are the last ones you see before the hang? 

Also upload your vbios (/sys/kernel/debug/dri/0/vbios.rom) from a
non-problematic boot.

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--- Comment #3 from Ondrej Zary <linux at rainbow-software.org> ---
Yes, that are the last messages.
nouveau.debug=trace does not seem to provide any more output

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--- Comment #4 from Ondrej Zary <linux at rainbow-software.org> ---
Created attachment 114682
  --> https://bugs.freedesktop.org/attachment.cgi?id=114682&action=edit
BIOS

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--- Comment #5 from Ondrej Zary <linux at rainbow-software.org> ---
By adding printks to the code, I found that it hangs in
drm_fb_helper_single_add_all_connectors()

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--- Comment #6 from Ondrej Zary <linux at rainbow-software.org> ---
Sorry, I missed one printk. It hangs in drm_helper_disable_unused_functions()

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--- Comment #7 from Ondrej Zary <linux at rainbow-software.org> ---
Hangs while disabling LVDS:

[  261.444665] before fbcon_init
[  261.444733] before helper_prepare
[  261.444743] before helper_init
[  261.444769] before helper_add_all_conn
[  261.444780] after helper_add_all_conn, ret=0
[  261.444833] before disable_unused
[  261.444843] drm_helper_disable_unused_functions
[  261.445683] __drm_helper_disable_unused_functions
[  261.445697] encoder=DAC-28
[  261.445755] encoder not in use
[  261.445765] setting dpms off
[  261.445797] encoder disabled ok
[  261.445806] encoder=LVDS-30
[  261.445859] encoder not in use
[  261.445868] setting dpms off

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
One thing to note is that your DCB has 3 items:

DCB 0: type 0 [ANALOG] I2C 0 heads 0 conntag 0 LOCAL OR 0 maxfreq 350000kHz
DCB 1: type 4 [???] I2C 1 heads 1 unk00_4 1 conntag 1 LOCAL OR 1
DCB 2: type 1 [TV] I2C 1 heads 0 unk00_4 1 conntag 2 EXT 0 OR 0

Type 4 is a reserved type, I've seen it used for external encoders like the
external DVI encoder on 6150SE nForce motherboards. (There is also Type 3,
LVDS, which you don't appear to have, but perhaps it didn't exist in the
NV11
days.) However you're seeing a LVDS connector in the logs, which means that
*somehow* it knows...

BTW, a bunch of the dispnv04 code uses NV_DEBUG() which IIRC will show up with
drm.debug=0xe. I thought I had changed it to work with nouveau.debug, but...
you may be using an older kernel, or I'm misremembering.

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--- Comment #9 from Ondrej Zary <linux at rainbow-software.org> ---
It looks like it hangs in nv04_dfp_get_bound_head() in the final NVReadRAMDAC
call (in return):

[  356.630063] encoder disabled ok
[  356.630072] encoder=LVDS-30
[  356.630125] encoder not in use
[  356.630134] setting dpms off
[  356.630156] nv04_lvds_dpms
[  356.630167] Setting dpms mode 3 on lvds encoder (output 1)
[  356.630219] before power_scripts
[  356.630229] use_power_scripts
[  356.630251] nv04_dfp_get_bound_head
[  356.630261] nv04_dfp_get_bound_head after writeRAMDAC

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Martin Peres <martin.peres at free.fr> changed:

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

--- Comment #10 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

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