Nouveau - May 2014 - [Bug 78748] New: Nouveau fails initializing KMS on Geforce2 Go (NV11M)

https://bugs.freedesktop.org/show_bug.cgi?id=78748

          Priority: medium
            Bug ID: 78748
          Assignee: nouveau at lists.freedesktop.org
           Summary: Nouveau fails initializing KMS on Geforce2 Go (NV11M)
        QA Contact: xorg-team at lists.x.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: isma.casti at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 99105
  --> https://bugs.freedesktop.org/attachment.cgi?id=99105&action=edit
Video bios (10de:0112 NVIDIA Corporation NV11M [GeForce2 Go] (rev b2))

Nouveau kernel module crashes at boot, trying to enable outputs.
It can not detect any modes.

All the outputs are turned off when the bug happens, so the system is unusable.

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--- Comment #1 from Ismael <isma.casti at gmail.com> ---
Created attachment 99106
  --> https://bugs.freedesktop.org/attachment.cgi?id=99106&action=edit
debug dmesg

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
My investigation of this led to mode being null. I guess I would have expected
bios->fp_no_ddc to be set, but it wasn't. Will look at the attached
vbios.

A workaround for now would be to change

drivers/gpu/drm/nouveau/nouveau_connector.c:nouveau_connector_detect_depth

        /* LVDS: panel straps */
        if (bios->fp_no_ddc) {
                if (bios->fp.if_is_24bit)
                        connector->display_info.bpc = 8;
                return;
        }

to be

        /* LVDS: panel straps */
        if (1 || bios->fp_no_ddc) {
                if (bios->fp.if_is_24bit)
                        connector->display_info.bpc = 8;
                return;
        }

Which will force it down this path. Alternatively you could change

                duallink = mode->clock >=
bios->fp.duallink_transition_clk;

to be

                duallink = mode && mode->clock
>bios->fp.duallink_transition_clk;

Which would also avoid the crash.

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Nouveau fails initializing  |[NV11] Nouveau fails
                   |KMS on Geforce2 Go (NV11M)  |initializing KMS on
                   |                            |Geforce2 Go (NV11M)

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
DCB table at 0xd537 version 1.5
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

Well that's a little odd... I suspect that throws off some of the logic.
Type 4
is "reserved". Yet, somehow it still detects that there's a
LVDS...

nvbios doesn't print the other stuff, so it'll take some more decoding
to work
out what's what... might look at that later.

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--- Comment #4 from Ismael <isma.casti at gmail.com> ---
Created attachment 99115
  --> https://bugs.freedesktop.org/attachment.cgi?id=99115&action=edit
dmesg after first patch (it's a different userland than first log)

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--- Comment #5 from Ismael <isma.casti at gmail.com> ---
Created attachment 99116
  --> https://bugs.freedesktop.org/attachment.cgi?id=99116&action=edit
patch #1

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--- Comment #6 from Ismael <isma.casti at gmail.com> ---
Created attachment 99117
  --> https://bugs.freedesktop.org/attachment.cgi?id=99117&action=edit
X.org log with patch #1 applied

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Ismael <isma.casti at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #99117|0                           |1
        is obsolete|                            |

--- Comment #7 from Ismael <isma.casti at gmail.com> ---
Created attachment 99122
  --> https://bugs.freedesktop.org/attachment.cgi?id=99122&action=edit
X.org log with patch #1 applied and xf86-video-nouveau

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Can you confirm that things work fine with the hack I suggested (i.e. your
patch #1)?

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--- Comment #9 from Ismael <isma.casti at gmail.com> ---
(In reply to comment #8)
> Can you confirm that things work fine with the hack I suggested (i.e. your
> patch #1)?
No, it didn't work. Nouveau does not crash anymore, but the screen just
flashes
and shows black and white garbage.

Sadly I do not have access to the hardware anymore, it was a customer's
hardware and he took it away. I suppose you can close this bug.
Sorry for not closing this down before, and thanks a lot for your help and
time.

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

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

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

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
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https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/108.

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