Hi Andrew, That is great to read, thank you for reporting back! In the mean time, this patch is in the discussion list with some kernel developers. It may be that although the patch works, it is not the best way to work around the issue and it may not even have something to do with the errata reported.
In the mean time someone from intel added a patch here: https://bugzilla.kernel.org/show_bug.cgi?id=109051 to re-enable auto-demotion. At least one user reported success already. I highly recommend everyone reading this to give that patch a try. I will try to put a kernel up in the coming weekend that people can test. If that is a fix, it is very likely to end up in the kernel main line. Please share your experience and thank you :) - Vincent -- 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
