Nouveau - Oct 2020 - Nouveau DRM failure on 5120x1440 screen with 5.8/5.9 kernel

I'm having a problem with both the 5.8 and 5.9 kernels using the nouveau DRM
driver. I have a laptop with a VGA card (specs below) connected to a 5120x1440
screen. At boot time, the card correctly detects the screen, tries to allocate
fbdev fb0, then the video hangs completely for 15-30 seconds until it goes
blank.

This used to work in Linux 5.7 and earlier, although it allocated a 3840x1080
fb instead of a 5120x1440. I've attached the full dmesg. I tried commands
like
video=DP-2:3840x1080 but it doesn't help.

Linux 5.8 boots without hanging if the laptop is not connected to the 5120x1440
screen.


PCI specs:

01:00.0 0300: 10de:0dfc (rev a1)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108GLM [NVS 5200M] (rev
a1)


xrandr available resolutions reported (from Linux 5.7 using Xorg):

Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 16384 x 16384
LVDS-1 unknown connection (normal left inverted right x axis y axis)
    1600x900      59.99 +  40.00
    5120x1440     60.00
    1360x1020     73.97
    1152x864      59.97
    1024x768      59.95
    800x600       59.96
    640x480       59.94
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 5120x1440+0+0 (normal left inverted right x axis y axis)
1200mm x 340mm panning 5120x1440+0+0
    3840x1080     59.97 +
    5120x1440     29.98*
    2560x1080     60.00    59.94    59.98
    1920x1080     60.00    60.00    50.00    59.94
    1920x1080i    60.00    50.00    59.94
    1600x1200     60.00
    1280x1024     75.02    60.02
    1280x800      59.81
    1152x864      75.00
    1280x720      60.00    50.00    59.94
    1024x768      75.03    60.00
    800x600       75.00    60.32
    720x576       50.00
    720x480       60.00    59.94
    640x480       75.00    60.00    59.94
    720x400       70.08
HDMI-1 disconnected (normal left inverted right x axis y axis)
VGA-1 disconnected (normal left inverted right x axis y axis)

I'm currently using 5120x1440 at 30. 60 Hz isn't available. But look
below:


xrandr resolutions from Linux 5.9 (even though screen is still blank):

Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 16384 x 16384
LVDS-1 unknown connection (normal left inverted right x axis y axis)
    1600x900      59.99 +  40.00
    5120x1440     60.00
    1360x1020     73.97
    1152x864      59.97
    1024x768      59.95
    800x600       59.96
    640x480       59.94
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 5120x1440+0+0 (normal left inverted right x axis y axis)
1200mm x 340mm panning 5120x1440+0+0
    5120x1440     59.98 +  29.98*
    3840x1080     59.97 +
    2560x1080     60.00    59.94    59.98
    1920x1080     60.00    60.00    50.00    59.94
    1920x1080i    60.00    50.00    59.94
    1600x1200     60.00
    1280x1024     75.02    60.02
    1280x800      59.81
    1152x864      75.00
    1280x720      60.00    50.00    59.94
    1024x768      75.03    60.00
    800x600       75.00    60.32
    720x576       50.00
    720x480       60.00    59.94
    640x480       75.00    60.00    59.94
    720x400       70.08
HDMI-1 disconnected (normal left inverted right x axis y axis)
VGA-1 disconnected (normal left inverted right x axis y axis)


Let me know if you need additional debug information/etc.

Thanks,
  -Byron
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On Tue, 13 Oct 2020, Byron Stanoszek wrote:
> I'm having a problem with both the 5.8 and 5.9 kernels using the
nouveau DRM
> driver. I have a laptop with a VGA card (specs below) connected to a
> 5120x1440 screen. At boot time, the card correctly detects the screen,
tries
> to allocate fbdev fb0, then the video hangs completely for 15-30 seconds
> until it goes blank.
This message eventually displays after a while:

Workqueue: nvkm-disp nv50_disp_super
RIP: 0010:nv50_disp_super_2_2+0x1b0/0x470
Code: 69 00 00 48 69 c0 d3 4d 62 10 48 c1 e8 26 49 89 c5 0f b7 43 40 44 89 e9 8d
44 02 f9 0f b7 53 46 29 d0 31 d2 48 98 49 0f af c4 <48> f7 f1 48 89 c6 0f
b7 43 4e 0f b7 53 4c 83 e8 19 29 d0 31 d2 48
RSP: 0018:ffffc900005e3e08 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff88841b08ed20 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc90003614200 RDI: ffffffff820c1140
RBP: ffff88841b202060 R08: 0000000000000000 R09: 00000000000061ce
R10: 0000000000000018 R11: 0000000000000018 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88841b96b800 R15: ffff88841b975000
FS:  0000000000000000(0000) GS:ffff88841dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f922e61e000 CR3: 000000000240a004 CR4: 00000000001706b0
Call Trace:
  ? nvkm_dp_disable+0x5d/0x70
  ? nv50_disp_super+0x137/0x220
  ? process_one_work+0x19c/0x2c0
  ? worker_thread+0x48/0x350
  ? process_one_work+0x2c0/0x2c0
  ? kthread+0x129/0x150
  ? __kthread_create_worker+0x100/0x100
  ? ret_from_fork+0x22/0x30
---[ end trace dbb0d14fd1ddb445 ]---
nouveau 0000:01:00.0: DRM: core notifier timeout

Thanks,
  -Byron