`drm: intel_pipe_config_compare .. mismatch in ips_enabled (expected 1, found 0)` Error on boot [15.10 on a Macbook Pro 11,1]

Question

I just got Ubuntu 15.10 installed on my mac machine. Initially everything works well.

Following the help.ubuntu.com tutorial on fixing the touchpad (for utopic), I installed a bunch of things and did some config. After that I restarted lightdm with

systemctl restart lightdm

which consequently did a reboot. But it got stuck at shutting down so I ended up forcing the shut-down. When I re-started it I kept seeing many lines of

 [drm: intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0) 

while starting WPA supplicant in the process of starting Light Display Manager and was not able to boot into Ubuntu. I tried rebooting it many times but I was greeted by the same error.

^{(Click image to enlarge)}

What is going on? Without reinstalling Ubuntu, is there a way to fix this?

Answer 1

After plugging in a usb keyboard and getting into tty2 with Control+ alt + F2 (since I couldn't produce alt and/or F2 output on the Macbook P keyboard), I tried purging & reinstalling xorg and lightdm as suggested in this post but to no avail.

So I decided to start removing everything I installed on Ubuntu before encountering this error.. and (finally!) I managed to boot into ubuntu again by getting rid of bcmwl-kernel-source for the wifi:

sudo apt-get remove bcmwl-kernel-source

Hmmm. Now I'd need to figure out why bcmwl-kernel-source is causing this error.

Answer 2

I have faced the same problem on my Lenovo laptop, every time my Ubuntu starts it shows this error and displays Ubuntu running in low graphic mode.

Then, after a bit struggling I am not getting the solution, so as a random thought I removed my latest installed softwares and My Ubuntu is back to work.

Steps I followed:

1. When the error popped up, I pressed Ctrl+Alt+F3, it opened virtual terminal and I entered my login and password.

2. Then used this command:

   history | grep install
   

   After this output showed, what all software packages I had recently installed. Mine showed fdlrx, xdm, openvpn.

3. Removed those packages using:

   sudo apt-get remove fdlrx
   sudo apt-get remove xdm
   sudo apt-get remove openvpn
   sudo apt-get remove bcmwl-kernel-source
   

   Last command, I take from this page only.

4. Then rebooted the system using command using command:

   reboot