I may have found the reason. I'll write an assumption, but I'll test it
soon. The fact is that the discrete video card is switched to D3Cool
mode and does not exit it. There are several ways to prevent this from
happening
1.
lspci | grep -i nvidia
cat /sys/bus/pci/devices/0000:01:00.0/power_state
echo "0" | sudo tee /sys/bus/pci/devices/0000:01:00.0/d3cold_allowed
2.
sudo nano /etc/udev/rules.d/80-nvidia-d3cold.rules
ACTION=="add", SUBSYSTEM=="pci", ATTR{d3cold_allowed}="0"
sudo udevadm control --reload-rules
sudo udevadm trigger
3.
sudo nano /etc/modprobe.d/nvidia-power.conf
options nvidia NVreg_DynamicPowerManagement=0x00
sudo update-initramfs -u
sudo reboot
I used method 2 now D3Cool mode is disabled. So far, there have been no
reboots, but there have been periods before when they were not available for
quite a long time. I'll wait.
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https://bugs.launchpad.net/bugs/2088440
Title:
Xorg freeze
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