** Description changed:
Relying on the nouveau driver and on the vga switcheroo (to get around a
change in systemd LP: #1777099) caused increased power consumption, and
slowed down the switching process.
- Solving the problem in systemd (LP: #1777099), and adding code in gpu-
- manager and in nvidia-prime to unload the nvidia modules, and to allow
- the PCI device to sleep, dramatically decreases power consumption.
+ Furthermore, if the main X/Xwayland session was started by Gdm when the
+ nvidia driver was loaded, the session will keep the nvidia module
+ loaded, and prevent the system from switching off the dGPU. Also, the
+ nouveau driver will be loaded, if nvidia is not, and this can cause
+ problems to unsupported NVIDIA GPUs.
+
+ The solution involves the following changes:
+
+ 1) Solving the problem in systemd (LP: #1777099)
+
+ 2) Adding code in gpu-manager and in nvidia-prime to unload the nvidia
+ modules, and to allow the PCI device to sleep.
+
+ 3) Making a slight change to the current patch in Gdm, used to call the
+ PRIME scripts before and after a Gdm session (so that gpu-manager gets
+ actually called on log out)
+
+ 4) Adding code in gpu-manager to kill the main X/Xwayland session on log
+ out, if the session is preventing us from unloading the nvidia driver. A
+ new X/Xwayland session will be created after unload the module.
+
+ 5) Removing the systemd service that loads nouveau from the nvidia
+ packages.
** Also affects: nvidia-graphics-drivers-390 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nvidia-graphics-drivers-390 (Ubuntu)
Status: New => Fix Released
** Changed in: nvidia-graphics-drivers-390 (Ubuntu Bionic)
Status: New => In Progress
** Changed in: nvidia-graphics-drivers-390 (Ubuntu)
Importance: Undecided => High
** Changed in: nvidia-graphics-drivers-390 (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: nvidia-graphics-drivers-390 (Ubuntu)
Assignee: (unassigned) => Alberto Milone (albertomilone)
** Changed in: nvidia-graphics-drivers-390 (Ubuntu Bionic)
Assignee: (unassigned) => Alberto Milone (albertomilone)
** Description changed:
- Relying on the nouveau driver and on the vga switcheroo (to get around a
- change in systemd LP: #1777099) caused increased power consumption, and
- slowed down the switching process.
+ SRU Request:
+
+ [Impact]
+ Relying on the nouveau driver and on the vga switcheroo (to get around a
change in systemd LP: #1777099) caused increased power consumption, and slowed
down the switching process.
Furthermore, if the main X/Xwayland session was started by Gdm when the
nvidia driver was loaded, the session will keep the nvidia module
loaded, and prevent the system from switching off the dGPU. Also, the
nouveau driver will be loaded, if nvidia is not, and this can cause
problems to unsupported NVIDIA GPUs.
The solution involves the following changes:
1) Solving the problem in systemd (LP: #1777099)
2) Adding code in gpu-manager and in nvidia-prime to unload the nvidia
modules, and to allow the PCI device to sleep.
3) Making a slight change to the current patch in Gdm, used to call the
PRIME scripts before and after a Gdm session (so that gpu-manager gets
actually called on log out)
4) Adding code in gpu-manager to kill the main X/Xwayland session on log
out, if the session is preventing us from unloading the nvidia driver. A
new X/Xwayland session will be created after unload the module.
5) Removing the systemd service that loads nouveau from the nvidia
packages.
+
+
+ [Test Case]
+ 1) Enable the -proposed repository, and install the new
"ubuntu-drivers-common", nvidia drivers, nvidia-prime, and gdm3
+
+ 2) Make sure the nvidia packages are installed, and enable performance mode
(if it is already enabled, call "sudo prime-select intel" first):
+ sudo prime-select nvidia
+
+ 3) Restart your computer and attach your /var/log/gpu-manager.log. see
+ if the system boots correctly. If unsure, please attach your /var/log
+ /gpu-manager.log and /var/log/Xorg.0.log
+
+ 4) Select power saving mode:
+ sudo prime-select intel
+
+ 5) Log out and log back in
+
+ 6) Check if the nvidia driver is still loaded:
+ lsmod | grep nvidia
+
+
+ [Regression Potential]
+ Low, as hybrid graphics support does not work correctly, and the changes only
affect this use case.
** Summary changed:
- PRIME Power Saving mode draws too much power
+ SRU: PRIME Power Saving mode draws too much power
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https://bugs.launchpad.net/bugs/1778011
Title:
SRU: PRIME Power Saving mode draws too much power
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