[Libva] using libva video compression on system with no monitor

[Gwenole Beauchesne]

2012/8/16 Xiang, Haihao <haihao.xiang at intel.com>:
> On Thu, 2012-08-16 at 10:25 +0200, Gwenole Beauchesne wrote:
>> Hi,
>>
>> 2012/8/16 Xiang, Haihao <haihao.xiang at intel.com>:
>>
>> >> I see a comment in /va/drm/va_drm_auth.c
>> >>
>> >>  /* Default: root + master privs are needed for the following call */
>> >
>> > Master is enough.
>>
>> Master requires "root" privileges.
>
> It works for me with just my user name.

You only need to be authenticated to submit drm commands, you don't
necessarily need master privs for that. Master privs requires root.

> xhh at xhh-snb32:~/graphics/ex/vaapi/libva/test/vainfo$ ./vainfo
> error: can't connect to X server!    <------ Without X server
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This is what I am saying. If you don't have an X server running, then
a simple user can get authenticated, should he have the correct access
rights to the device. In this case, you are authenticated and you
don't call into drmAuthMagic(), unlike what you suggested.