I am hitting this same issue with an Asus E402MA with Intel N3540 running Ubuntu 16.04.
Setting intel_idle.max_cstate=1 does not help (confirmed it's active in kernel log), so there could be two different bugs there. I have two ways in which the bug can be trivially and immediately reproduced: 1) One way to repro is to log in as one user, then switch to and log in as a second user. 2) Another way is to just launch Minecraft. It hangs immediately after loading a world. Both of these repro cases happen immediately when performing these tasks. The result is that the screen appears to be mostly frozen, the mouse cursor moves very little (unusable), the machine can be pinged from the outside, upon trying to log in over ssh it responds with a prompt but it's impossible to log in. I think this is slightly different than in the case of the other issue related to intel_idle.max_cstate=1 (this WAR does not help anyway). In the case of the cstate issue, the hang is more rare, it still occurs relatively frequently when using Chrome on any website with GPU (HW) acceleration enabled. Turning off GPU acceleration in Chrome reduces repro rate of this type of hang. In this case when the hang occurs, mouse cursor is not movable. I haven't confirmed yet whether this issue goes away with intel_idle.max_cstate=1 or not (need more time). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1575467 Title: [Dell Inspiron 3451] WARNING: CPU: 1 PID: 1297 at /build/linux-lts- utopic-vy2yyy/linux-lts- utopic-3.16.0/drivers/gpu/drm/i915/intel_display.c:1743 vlv_wait_port_ready+0x126/0x170 [i915]() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1575467/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
