Hello,
first a question about this merging with bug #770130 and #776911.
These bugs seem to happen on real hardware with some intel
graphics card and giving an error:
"*ERROR* pipe A underrun".
But bug #775235 was explicitly opened by Steve McIntyre to be
run inside a i386 KVM and gives an error:
"LLVM ERROR: Do not know how to split the result of this operator!"
Therefore I wonder if these should really be merged?
----------------
Second I searched a little bit further and came across
this patch discussion: https://freedesktop.org/patch/34445/
This is the start of the patch description by Maarten Lankhorst:
This fixes a crash when llvmpipe tries to use sse instructions,
but llvm detects a cpu that doesn't support them.
Fixes for example piglit/bin/amd_seamless_cubemap_per_texture -fbo -auto
on i386 when run inside "qemu -cpu qemu32", which would otherwise error
with:
"LLVM ERROR: Do not know how to split the result of this operator!"
Looks very similiar to our issue here.
Therefore I build a own local build of libgl1-mesa-dri and that was
successfully solving the issue inside the i386 KVM.
Unfortunately I cannot find this patch ever applied upstream.
The discussion reads (as far as I could follow) that there are
probably better ways to detect CPU features.
Also cannot say which impact it would have on every other systems.
----------------
Did some additional starts of the VM (with debian built packages) to verify:
qemu-system-i386 -cpu core2duo works
qemu-system-i386 -cpu pentium2 works
qemu-system-i386 --enable-kvm -cpu host works
qemu-system-i386 --enable-kvm -cpu kvm32 works
qemu-system-i386 --enable-kvm -cpu qemu32 fails
qemu-system-i386 --enable-kvm fails
qemu-system-x86_64 --enable-kvm fails
Unfortunately "qemu32" seems to be the default.
Kind regards,
Bernhard
These steps should make a local build of libgl1-mesa-dri with the mentioned
patch applied:
mkdir mesa; cd mesa
apt-get source libgl1-mesa-dri
cd mesa-10.3.2/
wget "https://freedesktop.org/patch/34445/raw/"; -O
debian/patches/08_gallivm_force_sse_instructions_for_llvm_3.5+.patch
echo 08_gallivm_force_sse_instructions_for_llvm_3.5+.patch >>
debian/patches/series
# install build dependencies
dpkg-buildpackage -b
cd ..
su
dpkg -i libgl1-mesa-dri_10.3.2-1_i386.deb
libgl1-mesa-dri-dbg_10.3.2-1_i386.deb
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