Created attachment 52431 [details]
screenshot of minecraft showing the noise/dirt

Hello everyone,

i am using a Intel(R) Sandybridge Mobile (GT2+) on Gentoo. When playing Minecraft, the first ten seconds or so, everything looks like it should. Then i get some "noise" and can for example see lava-lakes through the ground. I have the feeling it is a problem with transparency (see the glass in the screenshot).

Some more informations about my hard/software:

Dell Latitude e6420

brotscheibe brot # lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Device 0126 (rev 09)
brotscheibe brot # uname -a
Linux brotscheibe 3.1.0-rc6+ #21 SMP PREEMPT Tue Sep 27 20:15:31 CEST 2011 x86_64 Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz GenuineIntel GNU/Linux

mesa ( git: 53d32600cc1bf69e048ff6f75ead5ab3f627a3a5 (15.10.11))
libdrm ( git: b317c96361f88a0a4ccb2faeff09b0476d142c68 (11.10.11))
xorg-server ( git: fae7ed62ad476114bd37b566202cf6b6546c0a1f (4.10.11))
xf86-video-intel ( git: f1bb4ebfd8991f2f9eb9c38b9259792c11e7c86a (17.10.11))

maybe related is that after playing some time, i get a gpu hang. I added some info about the crash at another bugreport, see https://bugs.freedesktop.org/show_bug.cgi?id=41099

thanks for your work and have a nice day,

Michael