Comment 33 for bug 1488719

I have Lenovo Thinkpad L450 with Intel HD Graphics 5500 and I can confirm the issue is present in the mainline kernel 4.3.0-040300rc. I did not have real noticeable issue - I just see the error messages in the log. It can be reproduced by executing xrandr while an external monitor is connected to the laptop. Any time I execute it, it will produce the error messages. Also connecting the external monitor to DP2 (analog VGA) will produce the error messages in dmesg.

When there is only laptop screen on and no external display connected, it looks executing xrandr will not produce the errors.

The problem is present in 3.19.0-30 but it is not present in 3.19.0-15.
I tried also 3.19.0-28, but using this kernel, my external monitor and even my external USB mouse and keyboard did not work.