Use Xorg log to get the running Gfx driver information is not reliable

[hugh chao]

[Summary]
Use Xorg log as API isn't reliable at all, it can break at anytime, and this impacts all of the certificate process in oem team. Please use method like [1] to properly find out which DDX is opened by Xorg process.

[Steps to reproduce]
Run graphics/1_driver_version_GP102GL__Quadro_P620 by checkbox

[Expected result]
Can pass the test

[Actual result]
ERROR: No video driver loaded! Possibly in failsafe mode!
------------- VIDEO DRIVER INFORMATION -------------
------------- HYBRID GRAPHICS CHECK ----------------
Graphics Chipset: NVIDIA (10de:1cb6)
Loaded DDX Drivers: nouveau, modesetting, fbdev, vesa
Hybrid Graphics: no

[Additional information]
1. Nvidia P400
2. Nvidia P620
3. Nvidia P2200
4. Nvidia P6000
5. AMD RX 550

[Failure rate]
100%

[1] https://unix.stackexchange.com/a/452582

[hugh chao (hugh712)]

@Sylvain

mind help to take a look of this issue, this will impact all oem projects, thanks.

[William Hsu (williamhsu)]

A patch is under review.
- https://code.launchpad.net/~williamhsu/plainbox-provider-checkbox/+git/plainbox-provide-checkbox/+merge/386796

[Sylvain Pineau (sylvain-pineau)]

@Hugh,

Adding a new method to find the loaded drivers is a good idea. Mind developing a patch for https://git.launchpad.net/plainbox-provider-checkbox/tree/bin/graphics_driver ?

[hugh chao (hugh712)]

@Sylvain

sure, William is working on this :)

[Maksim Beliaev (beliaev-maksim)]

Bug was migrated to GitHub: https://github.com/canonical/checkbox/issues/170.
Bug is no more monitored here.