[Mesa-dev] [Bug 102682] vblank_mode ignored from ~/.drirc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102682

            Bug ID: 102682
           Summary: vblank_mode ignored from ~/.drirc
           Product: Mesa
           Version: 17.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: bugs.freedesktop at haasn.xyz
        QA Contact: mesa-dev at lists.freedesktop.org

Various sources (e.g. IRC) have led me to believe that `vblank_mode` should be
a settable option via ~/.drirc; however, it doesn't seem like this is the case
to me. A demonstration:

<driconf>
    <device screen="0" driver="radeonsi">
        <application name="Default">
            <option name="vblank_mode" value="0" />
        </application>
    </device>
</driconf>

I made this from the ~/.drirc skeleton created by `driconf`. Curiously, the
`vblank_mode` setting was also absent from that skeleton, but I added it
manually. (It's also absent from the GUI - although a friend of mine says he
has the option in his driconf interface!) As expected, this option seems to
have no effect - I still get vsync in all tested applications (e.g. glxgears).

I can override it manually by using the environment variable vblank_mode, e.g.
`vblank_mode=0 glxgears`. This *does* work, although it doesn't explain why
this option is seemingly ignored from ~/.drirc. More worrying is the fact that
the actual source code (dri3_set_swap_interval) uses configQuery("vblank_mode")
to get this value, so it should pull it from both XML and the environment,
right?

If this is not expected behavior, I can try stepping through the `configQuery`
function in gdb; but I thought I'd ask first in case this is a known or easily
explained issue.

Mesa version is 17.2.0, kernel version is 4.12.4, device is a Sapphire RX 560.

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