Re: AMD A8-3870

[Taylor R Campbell <campbell+netbsd-tech-x11%mumble.net@localhost>]

   Date: Sat, 15 Aug 2015 20:51:19 +0900
   From: Ryosuke Moro <szptvlfn%a-net.email.ne.jp@localhost>

   NetBSD 7.99.20 i386

   GENERIC kernel does not boot,

How does it fail?

                                 so i use modified kernel like this
           #radeon*    at pci? dev ? function ?
           #radeondrmkmsfb* at radeonfbbus?

   a bit strange lines in /var/log/Xorg.0.log

   [    66.860] (II) Loading /usr/X11R7/lib/modules/drivers/radeon_drv.so
   [    66.860] drmOpenDevice: node name is /dev/dri/card0
   [    66.902] drmOpenDevice: open result is -1, (Device not configured)
   [    66.903] drmOpenDevice: open result is -1, (Device not configured)
   [    66.903] drmOpenDevice: Open failed

These messages just mean that the X server was unable to open the
kernel's drm device node -- which makes sense because you disabled the
driver for that device node.