[Intel-gfx] Macmini6, 1 with i915 2:2.20.0-0ubuntu0~precise1 Hard Freezing and drm_ioctl Debug Message Help

Preston Connors prestonconnors at gmail.com
Thu Oct 10 17:27:50 CEST 2013

I am having an issue where my Macmini6,1 is hard freezing (no keyboard
control, have to power off and power back on using the power button) when
attempting to display a random video at random times but always freezing
when the video should be displayed by VLC during the start of the video. I
am suspecting it may be the i915 driver communicating with the Intel
Corporation 3rd Gen Core processor Graphics Controller (rev 09) graphics
controller. I'm having a problem debugging and pinpointing exactly what
might be freezing. and any help would be appreciated. This MacMini is
basically a simple kiosk that plays an mp4 video downloaded from Youtube;
the video plays, exits, and the next video plays ad infinitum.

The final message from vlc -vvv when the system freezes:
[0x7f91f0001248] xcb vout display debug: display is visible

With default kernel / device logging verbosities nothing is logged to
/var/log/syslog or /var/log/kern.log when the system freezes.

i915 package information:
Package: xserver-xorg-video-intel
Version: 2:2.20.0-0ubuntu0~precise1

kernel: 3.2.0-54-generic x86_64

vlc version: 2.2.0~~git20131009+r3076-0~r106+100~ubuntu12.04.1

I enabled some verbose debug options from grub to enable more verbose
output today:
rootwait ignore_loglevel debug debug_locks_verbose=1 sched_debug
initcall_debug mminit_loglevel=4 udev.log_priority=8 loglevel=8
earlyprintk=vga,keep log_buf_len=10M print_fatal_signals=1 apm.debug=Y
i8042.debug=Y drm.debug=1 scsi_logging_level=1 usbserial.debug=Y
option.debug=Y pl2303.debug=Y firewire_ohci.debug=1 hid.debug=1
pci_hotplug.debug=Y pci_hotplug.debug_acpi=Y shpchp.shpchp_debug=Y
apic=debug show_lapic=all hpet=verbose lmb=debug pause_on_oops=5 panic=10

These debugging options enabled drm:drm_ioctl to create 576 messages per
second being written to /var/log/syslog and /var/log/kern.log. These
messages are being generated while the system is operating normally
displaying an mp4 video via VLC.

Can you please help me out with what these debug messages mean? Are they

Here is the condensed version of the messages from /var/log/kern.log:

msg_count, msg

    240 [drm:drm_ioctl], pid=1416, cmd=0x4020645d, nr=0x5d, dev 0xe200,
    144 [drm:drm_ioctl], pid=1416, cmd=0xc00c6466, nr=0x66, dev 0xe200,
     96 [drm:drm_ioctl], pid=1416, cmd=0xc0086457, nr=0x57, dev 0xe200,
     24 [drm:drm_ioctl], pid=1416, cmd=0xc06864a1, nr=0xa1, dev 0xe200,
     24 [drm:drm_ioctl], pid=1416, cmd=0x6458, nr=0x58, dev 0xe200, auth=1
     24 [drm:drm_ioctl], pid=1416, cmd=0x40406469, nr=0x69, dev 0xe200,
     24 [drm:drm_ioctl], pid=1416, cmd=0x400c645f, nr=0x5f, dev 0xe200,

Unabridged version of one second of messages:

Once I understand these messages I'm going to wait for the system to fail
and see if there are different or new debug messages. Thanks in advance for
your help! I'm willing to troubleshoot and try different things to
determine the root cause of this freezing.

Thank you,
Preston Connors
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