Bug#792746: linux: Upgrading to thinkpad T440s laptop to 4.0.8-1 kernel causes external monitors to stop working, with "fifo underrun" error

Oh, it looks like switching to the text console also hits a WARNING, which might be relevant: Jul 17 17:11:17 branna kernel: [ 60.360540] [ cut here ] Jul 17 17:11:17 branna kernel: [ 60.360572] WARNING: CPU: 2 PID: 961 at /build/linux-aqtDGz/linux-4.0.8/drivers/gpu/drm

Bug#792746: linux: Upgrading to thinkpad T440s laptop to 4.0.8-1 kernel causes external monitors to stop working, with "fifo underrun" error

Source: linux Version: 4.0.8-1 Severity: important On my thinkpad T440s (Intel graphics), I often use an external (HDMI) monitor via a docking station. With the 3.16.7-ckt11 version of the kernel, this works great. With 4.0.8-1 (current in testing), it doesn't work at all -- it detects that the mo