[Bug 109209] i915 module results in total lockups without any dmesg trace on a NP900X5N Kaby Lake machine

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109209

--- Comment #6 from Jan <jv1 at home.nl> ---
A small update that might be of help.

Yesterday I started the laptop with 'i915.modeset=0'. After booting into shell
I used the laptop for hours, same as always when the i915 driver is 'disabled'
(did some reading and testing with the laptop how the kernel, udev,
block/devices, sys etc works; and how I can compile and install a single
module, without the need of compiling the whole kernel).

Then I removed the i915 driver with 'rmmod i915'. (required for the next step,
otherwise it complains about 'File Exists'). Subsequently inserted the module
with insmod -f /lib/modules/<version>/kernel/drivers/gpu/drm/i915/i915.ko.

After inserting the module the screen changed and the machine kept working.
However after some time the laptop hangs (repeated these steps a few times,
same results).

Also tested by removing the driver before the laptop hangs and see what
happens. Unfortunately the machine does not switch back to the basic GUI :-(
and I needed to connect via SSH. When I remove the module (via SSH) before the
hang the machine keeps working.

Furthermore I repeatedly removed (before an expected hang) and inserted the
module. Every (re)insertion of the module seems to result in a 'reset' in time
before a hang.

In one occasion... the machine kept on running 15 minutes before a hang, but
usually hangs much sooner.


Tested also with:   i915.modeset=1 nouveau.modeset=0 single debug drm.debug=14.
Kept the machine almost an hour. In single mode it runs much longer.
And tested with:   i915.modeset=1 nouveau.modeset=0 debug drm.debug=14. Machine
usually hangs within a few minutes.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20190105/72888cef/attachment.html>