Created attachment 122567 [details] kern.log when booting with acpi off Platform: Broxton P A0 Platform CPU Name : Intel(R) @ 1.2 GHz (family: 6, model: 92, stepping: 8) – 4 cores SoC : BROXTON-P A0 QDF : QYE2 CRB : Apollo Lake RVPC1 Fab1 Mandatory Reworks : R14 , R06C and R16 Software APLKRVPA.X64.0116.R20.1512211905 KSC: 1.05 Linux distribution: Ubuntu 15.10 64 bits Kernel: drm-intel-nightly 4.5.0 e7a7673 from http://cgit.freedesktop.org/drm-intel/ commit e7a7673e9840fe8b50a5a2894c75565ec7858a00 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Sat Mar 19 11:10:45 2016 +0100 drm-intel-nightly: 2016y-03m-19d-10h-09m-53s UTC integration manifest libdrm-2.4.67-7 49041c3 from git://anongit.freedesktop.org/mesa/drm mesa: mesa-11.1.2 7bcd827 from git://anongit.freedesktop.org/mesa/mesa git://anongit.freedesktop.org/cairo cairo: 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo waffle: bb29b2a from git://github.com/waffle-gl/waffle util-macros-1.19.0-2 d7acec2 from git://git.freedesktop.org/git/xorg/util/macros xorg-server-1.18.1 23e60f9 from git://git.freedesktop.org/git/xorg/xserver xf86-video-intel 2.99.917-560 d167280 from git://anongit.freedesktop.org/xorg/driver/xf86-video-intel libva-1.7.0.pre1 35f1447 from git://git.freedesktop.org/git/vaapi/libva vaapi-intel-driver 1.7.0.pre1 ab8e4e3 from git://anongit.freedesktop.org/vaapi/intel-driver DMC 1.4 from: https://01.org/linuxgraphics/intel-linux-graphics-firmwares intel-gpu-tools-1.14 c19b049 from http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git Steps: ------ 1. Boot in text mode 2. Execute some basic commands like change directory with tabulation Actual result: -------------- 2. Keyboard input needs delay and auto-completion needs sometimes 2 seconds Expected result: ---------------- 2. Console respond normally Info ---- We have abnormal numbers of failures in IGT (150 regressions), some basic tests frequently fails when executed in a loop Reproduced via ssh (login timeouts or needs also delay) Not reproduced with kernel boot command line: acpi=off
Created attachment 122568 [details] kern.log when booting Boot is abnormally long UI is very slow
Actual result when launching glxgears: http://vanaheimr.tl.intel.com/shared/temp/fdo%2094706.mp4
Created attachment 122603 [details] top
Created attachment 122604 [details] dmidecode
Created attachment 122605 [details] config-4.5.0-nightly+
Reproduced with kernel 4.5.0 f5d413c from nightly: commit f5d413cccefa1f93d64c34f357151d42add63a84 Author: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Date: Thu Mar 24 14:35:16 2016 +0000 drm-intel-nightly: 2016y-03m-24d-14h-34m-29s UTC integration manifest Set priority and severity to maxium
*** Bug 93797 has been marked as a duplicate of this bug. ***
See bug 93797 for a workaround for this. I don't think this is a graphics issue, but a problem related to system power states, since there is a bad interrupt latency affecting other devices too (keyboard, network). Based on this I'd like someone from the core team to look at this.
I confirm it is not reproduced with kernel boot command line: processor.max_cstate=2
This issue has been confirmed to be a problem on early steppings to be fixed in C stepping. There is a workaround patch available and on A stepping at least we can boot limiting CPU c states to work around the problem. As this isn't a graphics related issue and the relevant people are already aware of it, I'm closing this ticket.
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