Dear Maintainer,

As you advised here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=807598
I upgraded to the kernel 4.3, and removed the
  i915.preliminary_hw_support=1
kernel command-line argument.

Matters got worse.

I currently use the "wdm" session manager.
When logging on the graphical console, the desktop session is incompletely
set up: the background image appears but nothing else for many seconds from
the expected "cinnamon" environement; then the mouse cursor appears (a
right-click shows a contextual menu).

When I switch to a text console a kernel stacktrace appears.

After switching back and forth a few times, the xserver crashes (blank
screen on the graphical console, keyboard frozen).
This also happened when trying to restart the session manager
with
 # /etc/init.d/wdm restart

Is this a known problem?

Currently, my machine is mostly unusable with the i915 driver (no hardware
acceleration with kernel < 4.3, no graphical desktop with kernel = 4.3).

Would you recommend that I forego using the onboard graphics?

Thanks,
Gilles

Hi.

I'd like to add that the crash occurs with the "unstable" distribution
too (but "reportbug" aborted the report because a newer version was
available from "experimental").

Regards,
Gilles

Please follow https://01.org/linuxgraphics/documentation/how-report-bugs
to file a bug with intel.  Let us know the bug number for tracking.

Thanks,
Julien