Nouveau - Feb 2019 - [Bug 109613] New: nouveau: KMS is broken on last kernels (9700M GT)

https://bugs.freedesktop.org/show_bug.cgi?id=109613

            Bug ID: 109613
           Summary: nouveau: KMS is broken on last kernels (9700M GT)
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: kurnevsky at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 143363
  --> https://bugs.freedesktop.org/attachment.cgi?id=143363&action=edit
dmesg logs from different kernels

I have KMS broken on my laptop Acer Aspire 8930G after upgrading from 4.10.13
to 4.11.2 kernel (also checked 4.11.9, the last version 4.20.7 and some
versions between). With kernel parameter 'nouveau.modeset=0' it boots
fine.
Here is a picture how it looks on the screen after modeset:
https://imgur.com/a/kr3rbFJ

Laptops's lspci:

00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
Controller Hub (rev 07)
00:01.0 PCI bridge: Intel Corporation Mobile 4 Series Chipset PCI Express
Graphics Port (rev 07)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #4 (rev 03)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #5 (rev 03)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1
(rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2
(rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4
(rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5
(rev 03)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #1 (rev 03)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #2 (rev 03)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #3 (rev 03)
00:1d.3 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #6 (rev 03)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port
SATA Controller [AHCI mode] (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 Family)
Thermal Subsystem (rev 03)
01:00.0 VGA compatible controller: NVIDIA Corporation G96M [GeForce 9700M GT]
(rev a1)
02:00.0 Ethernet controller: Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or
Fast Ethernet (rev b0)
05:00.0 Network controller: Intel Corporation WiFi Link 5100

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--- Comment #1 from Evgeny Kurnevsky <kurnevsky at gmail.com> ---
Bisected to exact commit that breaks it:
800efb4c2857ec543fdc33585bbcb1fd5ef28337

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Could you include your vbios?

It's rather surprising that a change to fan control logic, intended to
really
only affect nv4x, would affect your display. But it's probably messing with
GPIOs it shouldn't be touching ... or something?

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--- Comment #3 from Evgeny Kurnevsky <kurnevsky at gmail.com> ---
Created attachment 143489
  --> https://bugs.freedesktop.org/attachment.cgi?id=143489&action=edit
vbios

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Thanks. Upon further review, there was a fixup to the commit you bisected to,
which is included in v4.20.11 or later. Can you try that? Or alternatively
apply
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=118780066e30c34de3d9349710b51780bfa0ba83
to your tree.

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--- Comment #5 from Evgeny Kurnevsky <kurnevsky at gmail.com> ---
Tried 4.20.12 version - nothing changed. This patch was included in 4.20.11
version: https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.11

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--- Comment #6 from Evgeny Kurnevsky <kurnevsky at gmail.com> ---
Also removing call to nvkm_therm_update_linear_fallback on 4.20 branch fixes
the issue.

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

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

--- Comment #7 from Martin Peres <martin.peres at free.fr> ---
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