[Bug 245702] x11-drivers/xf86-video-ati-legacy does not work under 12.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245702

--- Comment #6 from Anders Liljeborg <andlil9999 at gmail.com> ---
(In reply to Niclas Zeising from comment #5)

I have been using drm-legacy-kmod.

Now I installed drm-fbsd12.0-kmod, this uninstalls drm-kmod and
drm-legacy-kmod.
Rebooted.

1005 dataserv:~> kldstat
Id Refs Address        Size Name
 1   61   0x800000  19a6b64 kernel
 2    1 0x1f400000     7000 fdescfs.ko
 3    1 0x1f407000     b000 linprocfs.ko
 4    2 0x1f412000    50000 linux.ko
 5    1 0x1f462000     7000 linsysfs.ko
 6    1 0x1f469000     7000 nullfs.ko
 7    1 0x1f470000   177000 radeonkms.ko
 8    2 0x1f5e7000    7f000 drm.ko
 9    5 0x1f666000    18000 linuxkpi.ko
10    4 0x1f67e000    1a000 linuxkpi_gplv2.ko
11    2 0x1f698000     5000 debugfs.ko
12    1 0x1f69d000    16000 ttm.ko
13    1 0x1f6b3000     4000 radeon_R520_cp_bin.ko
14    1 0x1f6b7000     6000 uhid.ko
15    1 0x1f6bd000     7000 wmt.ko
16    1 0x1f6c4000     8000 ums.ko
17    1 0x1f6cc000    2f000 ipfw.ko
18    1 0x1f6fb000     4000 mac_ntpd.ko


startx gives same error:
[ 12580.071] (EE) Screen(s) found, but none have a usable configuration.

"What happens if you try the modesetting driver instead?"
Do you mean 
kld_list="/boot/modules/radeonkms.ko"
in /etc/rc.conf ?
That I am already using.

THEN I had the good idea to do eaxctly what the Handbook says about old
xorg.conf files, I removed
/etc/X11/xorg.conf
and
/usr/local/etc/X11/xorg.conf

Then startx gives kernel panic, and reset button have to be used to get my
computer started.
Since I am doing all this remotely via ssh, I cannot try this many times. I
have to call a person at my work to press the reset button. I do not have the
details what the sysconsole said about the panic. I have to be at work to
continue experiments. Unless you have a good tip to avoid kernel panic.

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