Bug 11982

Summary: linux-intel: i915 driver times out during drm initialization causing 30s delay in boot to login prompt
Product: [Yocto Project Subprojects] Kernel Reporter: Henry Bruce <henry.bruce>
Component: linux-yoctoAssignee: Saul Wold <sgw>
Status: RESOLVED MOVED QA Contact:
Severity: normal    
Priority: Medium+    
Version: 2.3.1   
Target Milestone: 2.4 M4   
Hardware: x86   
OS: Multiple   
Whiteboard:
OS type for building Yocto: --- Type of Regression: ---
Verified: Documentation change: Don't know
Attachments:
Description Flags
linux-intel kernel log none

Description Henry Bruce 2017-08-25 18:26:03 UTC 
Created attachment 3952 [details]
linux-intel kernel log

When booting on CherryTrail hardware with linux-intel 4.9.30, drm driver time outs during initialization
[    5.539880] sd 0:0:0:0: [sda] Attached SCSI removable disk
[   14.933791] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR* [CRTC:42:pipe B] flip_done timed out
[   14.952792] Console: switching to colour frame buffer device 240x67
[   25.685447] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR* [CRTC:42:pipe B] flip_done timed out
[   35.925117] [drm:drm_atomic_helper_commit_cleanup_done] *ERROR* [CRTC:42:pipe B] flip_done timed out
[   37.041314] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

This appears to be a known kernel bug: https://bugs.freedesktop.org/show_bug.cgi?id=98810.

Steps to re-create
------------------
$ git clone -b pyro git://git.yoctoproject.org/poky
$ git clone -b pyro git://git.yoctoproject.org/meta-intel
$ source poky/oe-init-build-env
$ bitbake-layers add-layer ../meta-intel
$ echo 'MACHINE = "intel-corei7-64"' >> conf/local.conf
$ bitbake core-image-base
$ sudo dd if=tmp/deploy/images/intel-corei7-64/core-image-base-intel-corei7-64.wic of=/dev/sdd bs=1MB
$ sync
Now boot hardware with wic image. Observe 30s delay in getting to login prompt.
Log is attached as linux-intel.4.9.30.log.

Workaround
----------
Use linux-yocto kernel by adding following step
$ echo 'PREFERRED_PROVIDER_virtual/kernel = "linux-yocto"' >> conf/local.conf
Build re-build image and boot hardware with wic image. Observe no extra delay in getting to login prompt.
Comment 1 Saul Wold 2017-08-28 17:40:26 UTC 
Please file this with the github Issue tracker since that goes directly to the kernel team working on linux-intel.

https://github.com/01org/linux-intel-4.9/issues
Comment 2 Henry Bruce 2017-08-29 00:18:15 UTC 
Done. See https://github.com/01org/linux-intel-4.9/issues/13
Comment 3 Saul Wold 2017-08-31 14:44:10 UTC 
Issue is with the Intel Production Kernel issue, due to the DRM backport support. Closing this as moved the Production Kernel Issue tracking.
Comment 4 Saul Wold 2017-08-31 14:44:38 UTC 
see previous comment
Comment 5 Henry Bruce 2017-08-31 18:03:04 UTC 
Production kernel team have closed their issue as "filed in error" as they do not support CherryTrail.