[NV390 + GP108M [GeForce MX250] ]Nvidia driver is loaded on power saving mode sometimes

[Alex Wen]

[Summary]
While used Intel gfx card, nvidia driver is loaded sometimes. The Nvidia card continues to try to handle graphics tasks.

[Steps to reproduce]
1. Install 18.04.2 on Lenovo T490.
2. $sudo apt-get update
3. $sudo apt-get install nvidia-driver-390
4. Reboot system after step 3 is finished
5. select the Intel gfx card to use via prime-select
6. Reboot system again
7. Check nvidia driver is loaded or not

[Expected result]
Nvidia driver should not be loaded and handle some graphic tasks.

[Actual result]
Nvidia driver loading and handle some gfx tasks.

[Failure rate]
1/3

[Additional information]
Test platform: ThinkPad T490
Test image: Stock Ubuntu 18.04.2
Nvidia driver: NV390
NVidia card: Nvidia GP108M [GeForce MX250]

u@u-ThinkPad-T490:~$ ps -fe|grep nvidia
nvidia-+ 721 1 0 12:12 ? 00:00:00 /usr/bin/nvidia-persistenced --user nvidia-persistenced --no-persistence-mode --verbose
u 1814 1782 0 12:13 pts/0 00:00:00 grep --color=auto nvidia
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$ lsmod |grep nvidia
nvidia 14376960 12
ipmi_msghandler 102400 2 ipmi_devintf,nvidia
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$ prime-select query
intel
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$ cat /etc/issue
Ubuntu 18.04.2 LTS \n \l

u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$
u@u-ThinkPad-T490:~$ dpkg -l|grep nvidia-dri
ii nvidia-driver-390 390.116-0ubuntu0.18.04.1 amd64 NVIDIA driver metapackage
u@u-ThinkPad-T490:~$

[Gabriel Zhi Chen (gabrielzchen)]

Verify the issue on Padme-5 (X1 Extreme)

[Summary]
While used Intel gfx card, nvidia driver is loaded sometimes. The Nvidia card continues to try to handle graphics tasks.

[Steps to reproduce]
1. Install 18.04.2 on Lenovo X1 Extreme.
2. $sudo apt-get update
3. $sudo apt-get install nvidia-driver-390
4. Reboot system after step 3 is finished
5. select the Intel gfx card to use.
6. Reboot system again
7. Check nvidia driver is loaded or not

[Expected result]
Nvidia driver should not be loaded and handle some graphic tasks.

[Actual result]
The same as expected result. The issue can not reproduce

[Note]
Run the repro steps 10 time, every time executed smoothly, can not reproduce the issue anymore.

[Anthony Wong (anthonywong)]

@Alex Wen, I want to make sure I understand the failure rate correctly. Did you reboot 10 times, and you found nvidia kernel module was loaded in 3 times?

[Alex Wen (ronglu-wen)]

@Anthony, I did 3 time testing, it reproduced at the third time.

[Anthony Wong (anthonywong)]

From the attached syslog, there are many times that nvidia was loaded and only one time that nouveau was loaded.

@Alex
Please try again and when you see the issue again, please attach /var/log/dmesg and /lib/modprobe.d, thanks.

[Alex Wen (ronglu-wen)]

Trying to reproduce the bug, already did 13 times.