Even if it seems to be DM related, with older kernel (3.19) from vivid,
the errors from the log are gone.
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https://bugs.launchpad.net/bugs/1492764
Title:
[drm:intel_pipe_config_compare
@dradetsky
Thanks.
Fixed by disabling BT using rfkill on Kubuntu 15.04, kernel 3.19, on Lenovo
T440s with Intel 7260 (rev 83)
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https://bugs.launchpad.net/bugs/1354975
Title:
iwlwifi