[Bug 208333] Black screen with Kernel 5.8 rc1/2/3/4 with Nvidia Gtx 760 driver nouveau

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208333

--- Comment #9 from Nathan Bryant (nbryant at optonline.net) ---
I'm seeing similar symptoms on my Geforce GTX 1070 (GP104). Screen blanks after
GDM login, Wayland works, Xorg doesn't. This is a regression from 5.7 to
5.8-rc1.

As long as I only have my primary monitor connected, after the failure I can
still switch to another VT with Ctrl-Alt-F3 and log in to the text console.

~/.local/share/xorg/Xorg.0.log has a few of these:

[    17.240] (EE) modeset(0): failed to set mode: Invalid argument

Bisected to this commit:

fa4f4c213f5f7807360c41f2501a3031a9940f3a is the first bad commit
commit fa4f4c213f5f7807360c41f2501a3031a9940f3a
Author: James Jones <jajones at nvidia.com>
Date:   Mon Feb 10 15:15:55 2020 -0800

    drm/nouveau/kms: Support NVIDIA format modifiers

    Allow setting the block layout of a nouveau FB
    object using DRM format modifiers.  When
    specified, the format modifier block layout and
    kind overrides the GEM buffer's implicit layout
    and kind.  The specified format modifier is
    validated against the list of modifiers supported
    by the target display hardware.

    v2: Used Tesla family instead of NV50 chipset compare
    v4: Do not cache kind, tile_mode in nouveau_framebuffer
    v5: Resolved against nouveau_framebuffer cleanup

    Signed-off-by: James Jones <jajones at nvidia.com>
    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

 drivers/gpu/drm/nouveau/dispnv50/wndw.c   | 20 ++++---
 drivers/gpu/drm/nouveau/nouveau_display.c | 89 ++++++++++++++++++++++++++++++-
 drivers/gpu/drm/nouveau/nouveau_display.h |  4 ++
 3 files changed, 104 insertions(+), 9 deletions(-)

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