Turn on display debug information by running sudo xdiagnose, clicking the first checkbox, apply, then reboot.
Now collect dmesg output, then reproduce the problem and collect a second dmesg. You want the data that's in the second dmesg but not the first.
Possibly this bug is related to bug #737891
Turn on display debug information by running sudo xdiagnose, clicking the first checkbox, apply, then reboot.
Now collect dmesg output, then reproduce the problem and collect a second dmesg. You want the data that's in the second dmesg but not the first.
Possibly this bug is related to bug #737891