Date: Tue, 19 Feb 2013 08:22:43 GMT From: Anton Shterenlikht <mexas@bristol.ac.uk> To: freebsd-x11@freebsd.org Subject: why drm? Message-ID: <201302190822.r1J8MhbN019527@mech-cluster241.men.bris.ac.uk>
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I'm confused about DRM/DRI.
I've done some brief reading but still
not clear what these do, or
even if DRM and DRI do the same thing?
I've a laptop with
# pciconf -lv |grep Rade
device = 'RS690M [Radeon X1200 Series]'
#
which seems to be driven by
x11-drivers/xf86-video-ati
And that seems to work ok.
If I build a kernel with drm:
# grep drm /root/kernels/BUZI
device drm # DRM core module required by DRM drivers
device i915drm # Intel i830 through i915
device r128drm # ATI Rage 128
device radeondrm # ATI Radeon
device viadrm # VIA
#
(I probably don't need all these drm options)
then I get these messages:
[drm:pid1077:drm_open] open_count = 0
[drm:pid1077:drm_open_helper] pid = 1077, device = dri/card0
[drm:pid1077:radeon_driver_open]
[drm:pid1077:drm_addmap] offset = 0x00000000, size = 0x00002000, type = 2
[drm:pid1077:drm_addmap] 8192 13 0xffffff800281b000
[drm:pid1077:drm_addmap] Added map 2 0xffffff800281b000/0x2000
[drm:pid1077:drm_addmap] offset = 0xc0100000, size = 0x08000000, type = 0
[drm:pid1077:drm_addmap] Added map 0 0xc0100000/0x8000000
[drm:pid1077:drm_firstopen]
[drm:pid1077:drm_ioctl] pid=1077, cmd=0xc0406400, nr=0x00, dev 0xfffffe00028e3200, auth=1
[drm:pid1077:drm_ioctl] pid=1077, cmd=0xc0406400, nr=0x00, dev 0xfffffe00028e3200, auth=1
[drm:pid1077:drm_close] open_count = 1
[drm:pid1077:drm_close] pid = 1077, device = 0xfffffe00028e3200, open_count = 1
[drm:pid1077:drm_lastclose]
[drm:pid1077:radeon_do_cleanup_cp]
Do these indicate that all is fine?
If I then start X (via xdm): I see
these lines in /var/log/Xorg.0.log:
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 10, (OK)
drmOpenByBusid: Searching for BusID pci:0000:01:05.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 10, (OK)
drmOpenByBusid: drmOpenMinor returns 10
drmOpenByBusid: drmGetBusid reports pci:0000:01:05.0
These also seem allright.
However, I just get a black screen from
which I cannot recover and have to reboot.
So my questions:
1. Do I need DRM/DRI. My understanding is
that X will do just as well without it,
perhaps a bit slower. Is that correct?
2. In my using of DRM did I miss any steps?
I'd be grateful for any advice or a link
to a relevant existing document.
Many thanks
Anton
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