[AT&T Samsung Galaxy S II SGH-I777] iXNyNe:
Eureka!

#!/system/bin/sh

sleep 5

# ===================
# Max CPU
# ===================

echo "1200000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

# ===================
# Min CPU
# ===================

echo "200000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

# ===================
# Undervolting
# ===================

echo "1425 1300 1200 1100 1000 950 900 900 " > /sys/devices/system/cpu/cpu0/cpufreq/UV_mV_table

# ===================
# CPU Table
# ===================

echo "1600 1400 1200 1000 800 500 200 100" > /sys/devices/system/cpu/cpu0/cpufreq/freq_table;

# ===================
# Governor
# ===================

echo "conservative" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

# ===================
# Scheduler
# ===================

echo "noop" > /sys/block/mmcblk0/queue/scheduler;

# ====================================
# GPU Clock, Voltages & Thresholds
# ====================================

# Set GPU clocks (Valid values are: 100 114 133 160 200 267 300 400 )
echo "100 160 267" > /sys/class/misc/gpu_clock_control/gpu_control

# Set GPU Up and Down thresholds
echo "85% 45% 85% 70%" > /sys/class/misc/gpu_clock_control/gpu_control

# Set GPU voltages (Changes possible at +/-50mV ie at 50000 steps)
echo "800000 850000 1000000" > /sys/class/misc/gpu_voltage_control/gpu_control

# ======================================
# Switch Hotplug/DualCore/SingleCore
# ======================================

# Set Dynamic hotplug mode
echo "on" > /sys/devices/virtual/misc/second_core/hotplug_on

# ================================================================
# Deepsleep Levels
# cpulevel = 4 (100Mhz - 800Mhz, default), 5 (100Mhz - 500Mhz)
# buslevel = 0 (400MHz, default), 1 (266MHz), 2 (133MHz)
# ================================================================

# Set deep sleep frequency & bus speed:
echo 4 > /sys/devices/system/cpu/cpu0/cpufreq/deepsleep_cpulevel
echo 2 > /sys/devices/system/cpu/cpu0/cpufreq/deepsleep_buslevel

# ================================================
# Scaling Ondemand & Smooth Scaling Parameters
# ================================================

# Set scaling governor, according to available governors in your kernel
echo 100000 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate
echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor
echo 85 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
echo 10 > /sys/devices/system/cpu/cpufreq/ondemand/down_differential

# Smooth scaling parameters to control any governor jumping to higher frequency directly.
echo 2 > /sys/devices/system/cpu/cpu0/cpufreq/smooth_target
echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/smooth_offset
echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/smooth_step

# ======================================================
# Hot Plug Thresholds, Sampling Interval & Frequency
# ======================================================

# Set second core kick-in threshold for screen-on state
echo 25 > /sys/module/pm_hotplug/parameters/loadl
echo 70 > /sys/module/pm_hotplug/parameters/loadh

# Set second core kick-in threshold for screen-off state
echo 45 > /sys/module/pm_hotplug/parameters/loadl_scroff
echo 90 > /sys/module/pm_hotplug/parameters/loadh_scroff

# Set frequency below which second core will not be turned on, regardless of thresholds.
echo 500000 > /sys/module/pm_hotplug/parameters/freq_cpu1on

# Set hot plug sampling intervals for screen-on state
echo 200 > /sys/module/pm_hotplug/parameters/rate
echo 400 > /sys/module/pm_hotplug/parameters/rate_cpuon

# Set hot plug sampling intervals for screen-off state
echo 800 > /sys/module/pm_hotplug/parameters/rate_scroff

# ===================
# Bus Frequencies
# ===================

# Set bus frequencies for highest-to-lowest cpu frequencies and enable static bus frequency scaling
echo "0 0 0 1 1 2 2 2" > /sys/devices/system/cpu/cpu0/cpufreq/busfreq_static
echo enabled > /sys/devices/system/cpu/cpu0/cpufreq/busfreq_static

# =================================
# Touch Sensitivity Parameters
# =================================

# Set touch sensitivity (Possible values are between 40 to 80. Lower value = higher sensitivity)
echo 50 > /sys/devices/virtual/sec/sec_touchscreen/tsp_threshold

# ===================
# Disable logger
# ===================

if [ ! -d /data/.siyah ];
then
mkdir /data/.siyah;
chmod 777 /data/.siyah;
fi;
touch /data/.siyah/disable-logger;

# ======================
# GFX Stuff
# ======================

setprop debug.sf.hw 1; # HARDWARE RENDERING (GPU)
setprop video.accelerate.hw 1;
setprop debug.performance.tuning 1;

Working and stable (0.2.8 btw)