Hello there. I have previously tried to solve this problem but the only solution I found was to roll back to at least 430xx driver.
The problem is when I try to boot with the intel driver there is a problem with lightdm. I am able to enter tty that indicates that the dedicated graphics are not turned off at boot. I have tried with all switch methods but without success. I just get prompted with a black screen saying [FAILED] Failed to start Light Display Manage
optimus-manager log
[16] INFO: # Xorg pre-start hook
[16] INFO: Previous state was: {'type': 'pending_pre_xorg_start', 'requested_mode': 'intel', 'current_mode': 'nvidia'}
[16] INFO: Requested mode is: intel
[16] INFO: Checking for GDM display servers
[293] INFO: Available modules: ['nouveau', 'nvidia', 'nvidia_drm', 'nvidia_modeset', 'nvidia_uvm']
[293] INFO: Unloading modules ['nvidia_drm', 'nvidia_modeset', 'nvidia_uvm', 'nvidia'] (if loaded)
[739] INFO: Loading module acpi_call
[739] ERROR: Cannot load acpi_call. Continuing anyway. Error is: module acpi_call is not available for current kernel. Is the corresponding package installed ?
[739] INFO: Setting GPU power to OFF via acpi_call
[739] INFO: No ACPI string saved, trying them all (expect kernel messages spam)
[739] INFO: Sending ACPI string \_SB.PCI0.P0P1.VGA._OFF
[739] ERROR: Setting acpi_call to OFF. Continuing anyways. Error is: Cannot open /proc/acpi/call
[739] WARNING: acpi_call is enabled, pci_power_control option ignored.
[750] INFO: Loaded extra Intel Xorg options (0 lines)
[750] INFO: Loaded extra Intel Xorg options (0 lines)
[751] INFO: Writing to /etc/X11/xorg.conf.d/10-optimus-manager.conf
[751] INFO: Writing state {'type': 'pending_post_xorg_start', 'switch_id': '20200909T163901', 'requested_mode': 'intel'}
[751] INFO: Xorg pre-start hook completed successfully.
nvidia-smi
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 450.66 Driver Version: 450.66 CUDA Version: 11.0 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 GeForce 940MX Off | 00000000:01:00.0 Off | N/A |
| N/A 47C P0 N/A / N/A | 0MiB / 2004MiB | 0% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+
systemctl status lightdm.service
● lightdm.service - Light Display Manager
Loaded: loaded (/usr/lib/systemd/system/lightdm.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2020-09-09 16:39:03 CEST; 1min 5s ago
Docs: man:lightdm(1)
Process: 631986 ExecStart=/usr/bin/lightdm (code=exited, status=1/FAILURE)
Main PID: 631986 (code=exited, status=1/FAILURE)
Sep 09 16:39:03 fuzie-laptop systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 6.
Sep 09 16:39:03 fuzie-laptop systemd[1]: Stopped Light Display Manager.
Sep 09 16:39:03 fuzie-laptop systemd[1]: lightdm.service: Start request repeated too quickly.
Sep 09 16:39:03 fuzie-laptop systemd[1]: lightdm.service: Failed with result 'ex