Created attachment 2183 [details] nuc_dmesg_201410080319.log Hi, For NUC BSP: http://yocto-ab-master.jf.intel.com/pub/releases/2.0-rc2-dizzy-1.7-rc2/machines/nuc/core-image-sato-sdk-nuc.hddimg build, poky commit: 505a6b696ae990442de720e5e1135a3e44d5f75c, there are several errors in dmesg as below: Error messages in dmesg log: [ 0.479667] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 0.479668] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun [ 1.978667] udevd[116]: starting version 182 [ 2.014611] mei_me 0000:00:16.0: irq 27 for MSI/MSI-X [ 2.039133] snd_hda_intel 0000:00:1b.0: enabling device (0000 -> 0002) [ 2.039447] snd_hda_intel 0000:00:1b.0: irq 28 for MSI/MSI-X [ 2.073296] hub 1-1:1.0: USB hub found [ 2.073450] hub 1-1:1.0: 6 ports detected [ 2.104290] cfg80211: Calling CRDA to update world regulatory domain [ 2.109404] Intel(R) Wireless WiFi driver for Linux, in-tree: [ 2.109410] Copyright(c) 2003- 2014 Intel Corporation [ 2.109537] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002) [ 2.109644] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control [ 2.109730] iwlwifi 0000:02:00.0: irq 29 for MSI/MSI-X [ 2.110442] ACPI Warning: SystemIO range 0x000000000000f040-0x000000000000f05f conflicts with OpRegion 0x000000000000f040-0x000000000000f04f (\_SB_.PCI0.SBUS.SMBI) (20140724/utaddress-258) [ 2.110454] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver [ 2.114510] iwlwifi 0000:02:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm [ 2.124691] EFI Variables Facility v0.08 2004-May-17 [ 2.139993] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUG disabled [ 2.139999] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUGFS disabled [ 2.140003] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TRACING disabled [ 2.140007] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Wireless-N 2200 BGN, REV=0x104 [ 2.140072] iwlwifi 0000:02:00.0: L1 Disabled; Enabling L0S Attached dmesg log. Cheers, Ionut C
The DRM errors are related to the system BIOS. As per the reports in the following links the issue fixes after updating to the latest BIOS. https://bugs.archlinux.org/task/40952
As stated this is resolved as a BIOS Issue