[Bug 63914] [hsw] Cycling between GL/X rendering causes a hard hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63914

--- Comment #43 from Ben Widawsky <ben at bwidawsk.net> ---
Running intel-gpu-top + kde, I can now hit it quite fast:

#!/bin/bash

# demonstration of X server / OpenGL lockup on SLED SP3 Beta 2
# with Haswell graphics.  X server needs to be using "intel" driver.

export LIBGL_DRIVERS_PATH=/home/test/mesa/lib/
prog1=hypertorus
prog2=antmaze
prog3=phosphor

konsole --noclose -e sudo ./intel-gpu-tools/tools/intel_gpu_top

cd /usr/lib64/xscreensaver

vblank_mode=0 ./$prog1 -geometry 1280x1024+10+10 -delay 0 &

sleep 5

vblank_mode=0 ./$prog2 -geometry 1024x768+25+25 -delay 0 &
pid1=$!

mode=0
while true
do
    if [ $mode -eq 0 ]
    then
        vblank_mode=0 ./$prog3 -geometry 1024x768+425+25 -delay 0 &
        pid2=$!
    else
        vblank_mode=0 ./$prog2 -geometry 1024x768+25+25 -delay 0 &
        pid2=$!
    fi
    mode=$(( ( $mode + 1 ) % 2  ))
    # echo $mode

    sleep 10
    kill $pid1
    pid1=$pid2
done

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