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SubjectRe: DRM modesetting & sysfs
On Tue, Apr 8, 2008 at 10:17 PM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
>
> I just pushed a few changes updating the DRM modesetting sysfs support, both
> for debugging and eventual HAL friendliness.
>
> So far, the support is limited to describing outputs and generating hotplug
> events. A typical "card0" directory now looks like this:
>
> .
> |-- card0-DAC-1
> | |-- device -> ../../../../../../devices/pci0000:00/0000:00:02.0/drm/card0
> | |-- dpms
> | |-- edid
> | |-- modes
> | |-- power
> | | `-- wakeup
> | |-- status
> | |-- subsystem -> ../../../../../../class/drm
> | `-- uevent
> |-- card0-LVDS-1
> | |-- device -> ../../../../../../devices/pci0000:00/0000:00:02.0/drm/card0
> | |-- dpms
> | |-- edid
> | |-- modes
> | |-- power
> | | `-- wakeup
> | |-- status
> | |-- subsystem -> ../../../../../../class/drm
> | `-- uevent
> |-- dev
> |-- device -> ../../../../../devices/pci0000:00/0000:00:02.0
> |-- dri_library_name
> |-- power
> | `-- wakeup
> |-- subsystem -> ../../../../../class/drm
> `-- uevent
>
> Each output is listed, prefixed with its associated card number to
> disambiguate it at the top level /sys/class/drm directory (where it also has
> some symlinks). Currently, only DPMS, EDID, mode list and connection status
> properties are exported, but we could list more as needed. You can
> use 'udevmonitor --env' to look for hotplug events; you should see several at
> load time, and presumably some at connection hotplug time (though I haven't
> gotten that working yet, any ideas Jakob?).
>

I was going to suggest that you plug it into the hotplug_stage_two
function but it looks like you have already done that. Things might be
routed differently now then since the last time I looked at the code,
are you sure that stage_two is being run?

> Any thoughts on the interface? Anything in particular people would like to
> see?
>

Looks good, can you write to dpms, that is turn a monitor on and of,
that would be slightly cool but not overly useful. On the whole I
think exporting properties are fine, but I don't think setting modes
and crtc's are to be done in sysfs. However it is entirely possible.

> Thanks,
> Jesse

Cheers Jakob.


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