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 from
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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