https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219128
Bug ID: 219128
Summary: Mini-DP to VGA adapter doesn't work on FreeBSD 11.0-R
Product: Base System
Version: 11.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: naito.yuich...@gmail.com
Created attachment 182379
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=182379&action=edit
dmesg.log
I'm using Macbook Air 2012 for FreeBSD-11.0R.
I found my Mini-DisplayPort to VGA adapter doesn't work
to add second display for my presentation.
I don't think my adapter is broken,
because I rebooted my Macbook Air with OS X, it works.
And I remember my adapter worked on FreeBSD-10.3R.
On my FreeBSD-11.0R,
I've seen following dmesg, since I attached the adapter.
```
$ dmesg | tail -5
error: [drm:pid0:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
error: [drm:pid0:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
error: [drm:pid0:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
error: [drm:pid0:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
error: [drm:pid0:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
$ uname -a
FreeBSD air 11.0-RELEASE-p9 FreeBSD 11.0-RELEASE-p9 #0: Tue Apr 11 08:48:40 UTC
2017 r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
```
According to `https://wiki.freebsd.org/Intel_GPU`,
I got debug messages with `sysctl hw.dri.debug=2`.
See the attached `dmesg.log` file.
For my hardware information,
I attach `devinfo.log` and `pciconf.log`.
For software information,
I attach `kldstat.log`, `pkginfo.log` and `Xorg.0.log`.
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