Ok, I figured out what happened.
I had libegl1-mesa on hold because there is a grave bug opened for it
(#874656).
I decided to upgrade to the newest version despite this bug, and this seems
to have fixed my problem with 3D acceleration on my graphics card.
Removing the relevant configuration
Package: xserver-xorg-video-intel
Version: 2:2.99.917+git20161206-1
Severity: critical
Justification: breaks the whole system
Dear Maintainer,
After upgrading to sid, GDM was not able to start. The boot process stopped
with the message:
```
[FAILED] Failed to start User Manager for UID 117.
See
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