graphics/1_maximum_resolution_* tests always failed on 22.04

[Scott Hu]

Image: 22.04.1
Session type: x11 (NV GTX1650 SUPER)
Device CID: 202206-30360
Screen resolution: HD & 4k
plainbox-provider-checkbox: 0.65.0~ppa~ubuntu22.04.1

graphics/1_maximum_resolution_* always fails even the monitor already set to max resolution

I/O log:
Current compositor: x11

Maximum resolution found for each connected monitors:
 card1-HDMI-A-3: 1920x1080 (on, connected, disabled)

Current resolution found for each connected monitors:
 HDMI-0 (AOC): 1920x1080 @100%

The displays do not seem to be configured at their maximum resolution.
Please switch to the maximum resolution before continuing.

[Scott Hu (huntu207)]

In checkbox, it uses output in /sys/class/drm/card*-*/*/enabled to check if a monitor is enabled/disabled.

This method is inaccurate for NV Gfx. In the comparison of system resolution and monitor’s maximum resolution, disabled sysfs’s resolution would be considered as invalid resolution and tool would report I/O log above.

[Pierre Equoy (pieq)]

This seems to be a problem with the nvidia proprietary drivers:

https://forums.developer.nvidia.com/t/sys-class-drm-enabled-reports-disabled-for-enabled-monitors/51187

[Pierre Equoy (pieq)]

One solution is to remove the check on enabled/disabled if there is a nvidia GPU in the system.

[Pierre Equoy (pieq)]

Discussed with QA:

- This is a real issue with the graphics card vendor (see nvidia forum link), so it should be reported to engineers
- Script must be modified to include more information, because the current error message is unclear.

[Maksim Beliaev (beliaev-maksim)]

Bug was migrated to GitHub: https://github.com/canonical/checkbox/issues/244.
Bug is no more monitored here.