No texture filtering on RTT texture in 1.7.0

In 1.7.0 I cannot get texture filtering on RTT textures, whereas in 1.6.2 it worked just as with static textures (texture.setMinfilter(…)). Here is the test code (no external images needed):

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

from pandac.PandaModules import *
from direct.showbase.DirectObject import *

config = {
    "load-display": "pandagl",
    "win-size": "400 200",
    "framebuffer-multisample": "1",
    "multisamples": "4",
}
for var, val in config.items():
    ConfigVariableString(var).setValue(val)
import direct.directbase.DirectStart


# Create a rectangular tile in XZ plane.
def make_tile (sx, sz):

    vformat = GeomVertexFormat.getV3n3t2()
    vdata = GeomVertexData("data", vformat, Geom.UHStatic)
    vwvertex = GeomVertexWriter(vdata, "vertex")
    vwnormal = GeomVertexWriter(vdata, "normal")
    vwuvmap = GeomVertexWriter(vdata, "texcoord")

    vwvertex.addData3f(-0.5 * sx, 0.0, -0.5 * sz)
    vwnormal.addData3f(0.0, 1.0, 0.0)
    vwuvmap.addData2f(0.0, 0.0)
    vwvertex.addData3f(0.5 * sx, 0.0, -0.5 * sz)
    vwnormal.addData3f(0.0, 1.0, 0.0)
    vwuvmap.addData2f(1.0, 0.0)
    vwvertex.addData3f(0.5 * sx, 0.0, 0.5 * sz)
    vwnormal.addData3f(0.0, 1.0, 0.0)
    vwuvmap.addData2f(1.0, 1.0)
    vwvertex.addData3f(-0.5 * sx, 0.0, 0.5 * sz)
    vwnormal.addData3f(0.0, 1.0, 0.0)
    vwuvmap.addData2f(0.0, 1.0)

    tris = GeomTriangles(Geom.UHStatic)
    tris.addVertices(0, 1, 2)
    tris.closePrimitive()
    tris.addVertices(0, 2, 3)
    tris.closePrimitive()

    geom = Geom(vdata)
    geom.addPrimitive(tris)
    geomnode = GeomNode("tile")
    geomnode.addGeom(geom)

    ndpath = NodePath(geomnode)

    return ndpath


# Static texture.
tex1 = loader.loadTexture("maps/panda-model.jpg")
tex1.setMinfilter(Texture.FTLinearMipmapLinear)

# Same texture as above, but pulled through RTT.
buf2 = base.win.makeTextureBuffer("buf2", 1024, 1024)
cam2 = base.makeCamera2d(buf2)
sc2 = NodePath("sc2")
sc2.setDepthTest(False)
sc2.setDepthWrite(False)
cam2.node().setScene(sc2)
stile = make_tile(2.0, 2.0)
stile.reparentTo(sc2)
stex = loader.loadTexture("maps/panda-model.jpg")
stile.setTexture(stex)
tex2 = buf2.getTexture()
tex2.setMinfilter(Texture.FTLinearMipmapLinear)

# A tile with static texture.
tile1 = make_tile(1.0, 1.0)
tile1.reparentTo(render)
tile1.setPos(-0.8, 3.0, 0.0)
tile1.setTexture(tex1)

# A tile with RTT texture.
tile2 = make_tile(1.0, 1.0)
tile2.reparentTo(render)
tile2.setPos(+0.8, 3.0, 0.0)
tile2.setTexture(tex2)


# Rotate the two tiles for clearer aliasing effects.
def main_loop (task):

    dt = globalClock.getDt()
    rspeed = 20.0
    tile1.setR(tile1.getR() + rspeed * dt)
    tile2.setR(tile2.getR() + rspeed * dt)

    return task.cont


base.setBackgroundColor(0.0, 0.0, 0.0, 0.0)

render.setAntialias(AntialiasAttrib.MAuto)

taskMgr.add(main_loop, "main-loop")

run()

and here is a snapshot of what I see (the left tile has a static texture, and the right tile that same texture but pulled through RTT):

img835.imageshack.us/i/panda3drt … ngprob.png

Is this a bug in 1.7.0, or there is a new switch to flip?