Regression in 3.9~rc1 on some NVIDIA Pascal graphics cards

This is being discussed on tails-testers@ (Subject: Nvidia Pascal no longer loads gdm) + I’ve received some more data privately (Subject: Clean Tails 3.8 Nvidia Pascal dump.

Feature Branch: bugfix/15833-revert-to-stretch-nouveau-driver

Related issues

Related to #14910 (closed)
Related to #15116
Blocks #15334 (closed)

Original created by @intrigeri on 15833 (Redmine)

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