I ran into this issue as well, and switching from the modesetting driver
back to the intel driver in xorg.conf has helped tremendously. I went
from 15.10 through 16.04 (which was entirely broken for me, something
involving compiz I think) to 16.10, which worked, but had terrible
graphical performance. As for my hardware, I'm on an Acer Aspire v7,
using an Intel Haswell i7-4500U with HD Graphics 4400 (there's also an
nvidia GT750M, but I selected intel with prime-select, otherwise I get a
login loop). Running with the modesetting drivers, I found compiz
regularly had 5 processes going, each reporting as using 30% of a core,
and any sort of animation was unbearably choppy. I even had lag on the
lockscreen. I found that in the Xorg.0.log, it said:
[ 8.690] (II) AIGLX: Screen 0 is not DRI2 capable
[ 8.690] (EE) AIGLX: reverting to software rendering
[ 8.785] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[ 8.786] (II) AIGLX: Loaded and initialized swrast
[ 8.786] (II) GLX: Initialized DRISWRAST GL provider for screen 0
while with only changing to the intel driver, I see:
[ 8.687] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[ 8.687] (II) AIGLX: enabled GLX_ARB_create_context
[ 8.687] (II) AIGLX: enabled GLX_ARB_create_context_profile
[ 8.687] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile
[ 8.687] (II) AIGLX: enabled GLX_INTEL_swap_event
[ 8.687] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
[ 8.687] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
[ 8.687] (II) AIGLX: enabled GLX_ARB_fbconfig_float
[ 8.687] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float
[ 8.687] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
[ 8.687] (II) AIGLX: enabled GLX_ARB_create_context_robustness
[ 8.687] (II) AIGLX: Loaded and initialized i965
[ 8.687] (II) GLX: Initialized DRI2 GL provider for screen 0
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https://bugs.launchpad.net/bugs/1632165
Title:
modesetting driver unbearably slow on intel graphics
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