[Bug 236044] x11-drivers/xf86-video-ati GPU lockup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236044

            Bug ID: 236044
           Summary: x11-drivers/xf86-video-ati GPU lockup
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: vendion at gmail.com
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

Created attachment 202371
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202371&action=edit
dmesg output after running startx and getting blank screen

Occasionally when trying to start X11, just using the startx command for this,
I am left with just a blank screen rather than X11 and my window manager
starting. Also periodically when the display server is running the screen will
blank out and my monitor acts like it is not receiving any signal almost as if
the display server crashed.

FreeBSD version: 12.0-RELEASE-p3
xf86-video-ati version: 18.1.0,1
xorg-server: 1.18.4_11,1

Details on my graphics card from pciconf:

vgapci0 at pci0:10:0:0:    class=0x030000 card=0x24601462 chip=0x67191002 rev=0x00
hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Cayman PRO [Radeon HD 6950]'
    class      = display
    subclass   = VGA

I am loading the kernel module at boot with the following in my /etc/rc.conf
'kld_list="/boot/modules/radeonkms.ko"'

Other than font and keyboard settings I'm letting xorg autodetect everything at
run time.

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