Public bug reported:
Test environment/steps:
1. A desktop or workstation which containing an iGPU.
2. Plug a nvidia graphic card to the system and installing proprietary nvidia
driver (470 in my case)
3. Attach a monitor to dGPU and leave iGPU connect to nothing.
(in my test environment, there is the other ethernet card and TBT4 cards)
4. Reboot system.
Based on:
$ cat /lib/udev/rules.d/61-gdm.rules
# disable Wayland on Hi1710 chipsets
ATTR{vendor}=="0x19e5", ATTR{device}=="0x1711",
RUN+="/usr/lib/gdm3/gdm-disable-wayland"
# disable Wayland when using the proprietary nvidia driver
DRIVER=="nvidia", RUN+="/usr/lib/gdm3/gdm-disable-wayland"
It will disable wayland by default if proprietary nvidia driver load.
But in some race condition cases, the nvidia probe is later than gnome
launches. (The fail rate is 6/24.)
Thus, ubuntu-gdm has a fix for Bug#1794280 to add
"ExecStartPre=@libexecdir@/gdm-wait-for-drm".
The gdm-wait-for-drm is intend to make sure all drm udev devices enumerated
before launching gdm.
It rely on at least one "master-of-seat" graphic card for gdm but it's not
rigorous enough.
Since most of graphic cards are own "master-of-seat"[1].
In my case, it detects the iGPU is probed but dGPU.
However, the display is attached to dGPU.
We need to make sure the targeted gpu (connecting to monitor) is probe
before launching gdm.
[1] https://www.freedesktop.org/wiki/Software/systemd/multiseat/
/lib/udev/rules.d/71-seat.rules
/lib/udev/rules.d/71-nvidia.rules
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Assignee: jeremyszu (os369510)
Status: New
** Changed in: gdm3 (Ubuntu)
Assignee: (unassigned) => jeremyszu (os369510)
** Description changed:
- Test environment:
+ Test environment/steps:
1. A desktop or workstation which containing an iGPU.
2. Plug a nvidia graphic card to the system and installing proprietary nvidia
driver (470 in my case)
3. Attach a monitor to dGPU and leave iGPU connect to nothing.
(in my test environment, there is the other ethernet card and TBT4 cards)
4. Reboot system.
Based on:
- $ cat /lib/udev/rules.d/61-gdm.rules
+ $ cat /lib/udev/rules.d/61-gdm.rules
# disable Wayland on Hi1710 chipsets
ATTR{vendor}=="0x19e5", ATTR{device}=="0x1711",
RUN+="/usr/lib/gdm3/gdm-disable-wayland"
# disable Wayland when using the proprietary nvidia driver
DRIVER=="nvidia", RUN+="/usr/lib/gdm3/gdm-disable-wayland"
It will disable wayland by default if proprietary nvidia driver load.
- But in some race condition cases, the nvidia probe is later than gnome
launches.
+ But in some race condition cases, the nvidia probe is later than gnome
launches. (The fail rate is 6/24.)
Thus, ubuntu-gdm has a fix for Bug#1794280 to add
"ExecStartPre=@libexecdir@/gdm-wait-for-drm".
- The gdm-wait-for-drm is intend to make sure all drm udev devices
- enumerated before launching gdm.
+
+ The gdm-wait-for-drm is intend to make sure all drm udev devices enumerated
before launching gdm.
It rely on at least one "master-of-seat" graphic card for gdm but it's not
rigorous enough.
Since most of graphic cards are own "master-of-seat"[1].
In my case, it detects the iGPU is probed but dGPU.
However, the display is attached to dGPU.
We need to make sure the targeted gpu (connecting to monitor) is probe
before launching gdm.
[1] https://www.freedesktop.org/wiki/Software/systemd/multiseat/
/lib/udev/rules.d/71-seat.rules
/lib/udev/rules.d/71-nvidia.rules
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https://bugs.launchpad.net/bugs/1958488
Title:
[nvidia][xorg] display hangs on boot LOGO
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