[Bug 101771] MacBook Pro 2015 11,5 - Xorg fatal error on screen detection for kernels 4.10.0+ (and possibly 4.9.8+)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101771

--- Comment #7 from berg <berglh at gmail.com> ---
> Nothing in /var/log/kern.log*?

Nope, no sign of the kernel version starting at all: 

berg at bmbp:/var/log$ zcat kern* | grep "Linux version"
Jun 27 15:02:07 bmbp kernel: [    0.000000] Linux version 4.9.8-mbp115
(berg at bmbp) (gcc version 6.2.0 20161005 (Ubuntu 6.2.0-5ubuntu12) ) #1 SMP Mon
Feb 6 19:38:12 AEST 2017
Jun 27 17:11:22 bmbp kernel: [    0.000000] Linux version 4.9.8-mbp115
(berg at bmbp) (gcc version 6.2.0 20161005 (Ubuntu 6.2.0-5ubuntu12) ) #1 SMP Mon
Feb 6 19:38:12 AEST 2017

berg at bmbp:/var/log$ grep "Linux version" kern.*
kern.log:Jul 11 14:58:10 bmbp kernel: [    0.000000] Linux version 4.9.8-mbp115
(berg at bmbp) (gcc version 6.2.0 20161005 (Ubuntu 6.2.0-5ubuntu12) ) #1 SMP Mon
Feb 6 19:38:12 AEST 2017

> Without seeing the corresponding dmesg, from the Xorg log file it looks like
> you should make sure the radeon kernel module is loaded and properly
> initializes before Xorg starts.

I'm not sure how I would ensure that, and curious as to why it would be any
different starting Linux 4.10.0 from a LiveUSB key than from the internal SSD -
speed at which it's reading from the device? Can I add some kind of delay for
loading the video driver?

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