Created attachment 66154 [details]
output

System Environment:
--------------------------
Arch:            x86_64 
Platform:        Ironlake
Libdrm:	(master)libdrm-2.4.39-1-g7080bfdfd9b6c5f003daaef37ae9c329f2d46a6c
Mesa:	(master)a3685544e1e88828c4931059686cf3acc199079c
Xserver:(master)xorg-server-1.12.99.905
Xf86_video_intel:(master)2.20.4-58-g454cc8453af1852758c3396dbe303c13c5c1be27
Libva:	(staging)f12f80371fb534e6bbf248586b3c17c298a31f4e
Libva_intel_driver:(staging)82fa52510a37ab645daaa3bb7091ff5096a20d0b
Kernel:	(drm-intel-next-queued) 7788a765205f63abcb8645c16c85a968bd578f4f

Bug detailed description:
-------------------------
It fails on Ironlake with mesa master branch. It doesn't happen on 8.0 branch.

Bisect shows:85e8e9e000732908b259a7e2cbc1724a1be2d447 is the first bad commit.
commit 85e8e9e000732908b259a7e2cbc1724a1be2d447
Author:     Kenneth Graunke <kenneth@whitecape.org>
AuthorDate: Fri Aug 24 01:22:58 2012 -0700
Commit:     Kenneth Graunke <kenneth@whitecape.org>
CommitDate: Sat Aug 25 12:01:10 2012 -0700

    i965: Use linker-assigned sampler IDs in instruction encoding.

    When assigning uniform locations, the linker assigns each sampler
    uniform a sequential numerical ID.  gl_shader_program::SamplerUnits maps
    these sampler variable IDs to the actual texture units they reference
    (specified via glUniform1i).

    Previously, we encoded this mapping in the SEND instruction encoding:
    the "sampler" was the texture unit number, and the binding table index
    was SURF_INDEX_TEXTURE(the texture unit number).  This unfortunately
    meant that whenever the application changed the value of a sampler
    uniform, we had to recompile the shader to change the SEND instructions.

Reproduce steps:
----------------------------
1. xinit
2. ./bin/fp-fragment-position -auto