[Bug 1716857] Re: nvidia-drm.modeset=1, gdm3 and optimus laptop results in no external monitors detected by Xorg

[Jean-Pierre van Riel]

Hi, thanks to everyone, especially Daniel for unpacking this issue.

I have had a very similar issue, where gnome shell fails to run my
external 4K/UHD display at 60HZ and I see the following failure loop
triggered in  `journalctl -b -p warning _COMM=gnome-shell`:

May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to blit shared framebuffer: EGL failed to allocate resources for the requested operation.
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to set CRTC mode 3840x2160: No such file or directory
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to flip: Device or resource busy
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to set CRTC mode 3840x2160: No such file or directory
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to blit shared framebuffer: EGL failed to allocate resources for the requested operation.
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to set CRTC mode 3840x2160: No such file or directory
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to blit shared framebuffer: EGL failed to allocate resources for the requested operation.
May 02 20:39:38 JNBA434499PLL gnome-shell[1957]: Failed to set CRTC mode 3840x2160: No such file or directory
...


 While not sure it's exactly the same, it should still inform the
overall discussion about dealing with GDM3 + Mutter + proprietary Nvidia
drivers modeset problems.

To summarise and share my experience of it on a Lenovo P53 and some
quirks/workarounds:

- `sudo ubuntu-drivers autoinstall` got Nvidia 440.59 drivers installed.
- However, Nvidia modeset was not enabled as yet. 

$ sudo cat /sys/module/nvidia_drm/parameters/modeset
N

-

- Using prime-select

- For laptops like mine, seems the external port is connected to the Nvidia GPU.
- Using the proprietary Nvidia drivers seems to then bump into a 


** Attachment added: "gnome-shell_journal_warnings_egl_resource_failed.txt"
   https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1716857/+attachment/5365716/+files/gnome-shell_journal_warnings_egl_resource_failed.txt

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https://bugs.launchpad.net/bugs/1716857

Title:
  nvidia-drm.modeset=1, gdm3 and optimus laptop results in no external
  monitors detected by Xorg

Status in gdm3 package in Ubuntu:
  Opinion
Status in nvidia-graphics-drivers-375 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-418 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-430 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-435 package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Context:
  17.10 development packages, nvidia binary driver 375, modeset=1 for the nvidia driver.
  ubuntu desktop (gnome shell), fresh install
  ThinkPad W520 in Nvidia Optimus bios mode.
  Nvidia profile.

  Result:
  no external monitors are detected.
  xrandr does not even list them as disconnected (normally it would list five external disconnected monitors)

  
  lsmod 
  shows that nvidia driver is loaded
  and the modesetting is working at some level because there is no tearing on the laptop panel

  
  Note: modeset=1 is the only way to get flicker-free graphics on the laptop panel. modeset=1 is not the default setting but it is highly desirable. 

  It works if lightdm is used which is why I have reported this against gdm3
  My sessions in this configuration have mostly crashed after a few minutes with a gdm3 fail whale message in syslog but nothing else looks interesting.

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