Public bug reported:

[Impact]
On some I+N configs, It will take about 90+ seconds to open the 'Nvidia 
settings' window when 'Power Saving mode' running.


[Fix]
do not read config file if Nvidia driver did not loaded:

change nvidia-settings/src/nvidia-settings.c

    if (!op->no_load) {
        ret = nv_read_config_file(op, op->config, op->ctrl_display,
                                  p, &conf, &systems);

to
    if (!op->no_load && systems.n != 0) {
        ret = nv_read_config_file(op, op->config, op->ctrl_display,
                                  p, &conf, &systems);


[Test]
1. Install Ubuntu image.
2. Boot and login the system.
3. Open 'Nvidia Settings' app
4. Select the prime is 'Power saving' mode
5. Reboot system and login
6. Open 'Nvidia Settings' app
7. Verify the result


[Where problems will occur]
the "systems.n" gets from
    NvCtrlConnectToSystem(op->ctrl_display, &systems);
If there is a possibility that systems.n is zero and we still need to read 
nvidia config file, then it will be a problem. I tried and cannot find a 
situation like that.

** Affects: oem-priority
     Importance: Critical
     Assignee: Shengyao Xue (xueshengyao)
         Status: In Progress

** Affects: nvidia-settings (Ubuntu)
     Importance: Undecided
         Status: New

** Changed in: oem-priority
       Status: New => In Progress

** Also affects: nvidia-settings (Ubuntu)
   Importance: Undecided
       Status: New

-- 
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which is subscribed to nvidia-settings in Ubuntu.
https://bugs.launchpad.net/bugs/1943160

Title:
  [SRU] It will take about 90+ seconds to open the 'Nvidia settings' app
  when 'Power Saving mode' running.

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