diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index 0a8876e6..19fe0a3f 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -49,7 +49,8 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y \
             flawfinder squashfs-tools uuid-dev libuuid1 libffi-dev libssl-dev libssl1.1 \
-            libarchive-dev libgpgme11-dev libseccomp-dev wget gcc make pkg-config
+            libarchive-dev libgpgme11-dev libseccomp-dev wget gcc make pkg-config \
+            xvfb xdotool ffmpeg
 
       - name: Build and install Singularity
         run: |
@@ -83,3 +84,39 @@ jobs:
           ./test_reprostim_container.sh --version
           cd ../..
           pwd
+
+      - name: Test timesync-stimuli run
+        run: |
+          export FRAME_WIDTH=1920
+          export FRAME_HEIGHT=1080
+          export FRAME_RATE=60
+          export FRAME_BPP=24
+          export DISPLAY_PATH="/tmp/reprostim_last_display.txt"
+          export XVFB_OPTS="-screen 0 ${FRAME_WIDTH}x${FRAME_HEIGHT}x${FRAME_BPP} -ac +extension GLX +render -noreset"
+          export DISPLAY_START=25
+          export REPROSTIM_CMD="./run_reprostim_container.sh timesync-stimuli -m event --mute -d \$(cat /tmp/reprostim_last_display.txt)"
+          cd tools/ci
+          echo "Run Xvfb in background with REPROSTIM_CMD"
+          xvfb-run -a -n $DISPLAY_START -s "$XVFB_OPTS" bash -c "echo \$DISPLAY > ${DISPLAY_PATH}; $REPROSTIM_CMD"&
+          XVFB_RUN_PID=$!
+          echo "Started xvfb-run with PID $XVFB_RUN_PID"
+          echo "Wait for Xvfb to start"
+          sleep 4
+          export DISPLAY=$(cat ${DISPLAY_PATH})
+          echo "Xvfb started on display: $DISPLAY"
+          echo "Send test pulse events"
+          ./test_reprostim_events.sh 2 5 5 1.5 20 "${DISPLAY}" &
+          echo "Record video for 45 seconds"
+          ffmpeg -video_size "${FRAME_WIDTH}x${FRAME_HEIGHT}" -framerate "${FRAME_RATE}" -f x11grab -i "$DISPLAY" -t 45 -c:v libx264 -pix_fmt yuv420p "/tmp/reprostim_screenshot_$(date +%Y-%m-%d_%H-%M-%S).mp4"
+          sleep 45
+          ls -l /tmp/reprostim_*
+          echo "Kill Xvfb at the end"
+          sleep 1
+          kill $XVFB_RUN_PID 2>/dev/null || true
+          wait $XVFB_RUN_PID 2>/dev/null || true
+
+      - name: Upload screenshot video artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: reprostim-screenshot
+          path: /tmp/reprostim_screenshot*.mp4
diff --git a/docs/misc/xvfb-notes.md b/docs/misc/xvfb-notes.md
new file mode 100644
index 00000000..0a432fdd
--- /dev/null
+++ b/docs/misc/xvfb-notes.md
@@ -0,0 +1,103 @@
+# Virtual Screen Notes
+
+## Installation & Usage
+
+```shell
+sudo apt update
+sudo apt install xvfb
+sudo apt install xdotool
+
+which xvfb-run
+```
+
+Run in background mode as FullHD:
+```shell
+# use FullHD resolution, disables access control, enables GLX and 
+# render extensions, no reset at last client exit
+export XVFB_OPTS="-screen 0 1920x1080x24 -ac +extension GLX +render -noreset"
+
+# run on display :99
+Xvfb :99 -screen 0 1920x1080x24 &
+export DISPLAY=:99
+
+# or use automatic screen selection
+Xvfb --auto-servernum --server-num=20 --auto-servernum --server-num=20 -s "$XVFB_OPTS"
+
+```
+Run say `xterm` in background:
+```shell
+xvfb-run xterm &
+```
+
+Make PNG screenshot:
+```shell
+import -display :99 -window root "screenshot_$(date +%Y-%m-%d_%H:%M:%S).png"
+```
+
+Kill Xvfb at the end:
+```shell
+killall Xvfb
+```
+
+## Script Example
+
+Now all together in a script:
+```bash
+# install Xvfb
+sudo apt update
+sudo apt install xvfb
+sudo apt install xdotool
+which xvfb-run
+
+# setup params
+export FRAME_WIDTH=1920
+export FRAME_HEIGHT=1080
+export FRAME_RATE=60
+export FRAME_BPP=24
+export DISPLAY_PATH="/tmp/reprostim_last_display.txt"
+export XVFB_OPTS="-screen 0 ${FRAME_WIDTH}x${FRAME_HEIGHT}x${FRAME_BPP} -ac +extension GLX +render -noreset"
+export DISPLAY_START=25
+# export REPROSTIM_CMD="hatch run reprostim timesync-stimuli -m event --mute -d $(cat /tmp/reprostim_last_display.txt)"
+export REPROSTIM_CMD="./run_reprostim_container.sh timesync-stimuli -m event --mute -d $(cat /tmp/reprostim_last_display.txt)"
+
+cd tools/ci
+
+# run Xvfb in background with REPROSTIM_CMD
+xvfb-run -a -n $DISPLAY_START -s "$XVFB_OPTS" \
+  bash -c 'echo $DISPLAY > ${DISPLAY_PATH}; $REPROSTIM_CMD'&
+
+
+XVFB_RUN_PID=$!
+echo "Started xvfb-run with PID $XVFB_RUN_PID"
+  
+# wait for Xvfb to start
+sleep 2
+
+export DISPLAY=$(cat ${DISPLAY_PATH})
+echo "Xvfb started on display: $DISPLAY"
+
+# wait some time to start command
+# sleep 5
+
+# make screenshot
+# import -display $DISPLAY -window root "/tmp/reprostim_screenshot${DISPLAY}_$(date +%Y-%m-%d_%H:%M:%S).png"
+
+# send test pulse events
+./test_reprostim_events.sh 2 5 5 1.5 20&
+
+# record video for 45 seconds
+ffmpeg -video_size ${FRAME_WIDTH}x${FRAME_HEIGHT} -framerate ${FRAME_RATE} -f x11grab -i $DISPLAY \
+  -t 45 -c:v libx264 -pix_fmt yuv420p /tmp/reprostim_screenshot${DISPLAY}_$(date +%Y-%m-%d_%H:%M:%S).mp4
+
+sleep 45 
+
+# kill Xvfb at the end
+sleep 1
+kill $XVFB_RUN_PID
+wait $XVFB_RUN_PID 2>/dev/null
+```
+
+
+
+
+
diff --git a/docs/source/notes/index.rst b/docs/source/notes/index.rst
index 4a9ee51b..5dd81925 100644
--- a/docs/source/notes/index.rst
+++ b/docs/source/notes/index.rst
@@ -10,3 +10,4 @@ Miscellaneous Notes
     containers
     audiocodes-notes
     disp_mon-notes
+    xvfb-notes
diff --git a/docs/source/notes/xvfb-notes.rst b/docs/source/notes/xvfb-notes.rst
new file mode 100644
index 00000000..cbf7193b
--- /dev/null
+++ b/docs/source/notes/xvfb-notes.rst
@@ -0,0 +1,2 @@
+.. include:: ../../misc/xvfb-notes.md
+   :parser: myst_parser.sphinx_
diff --git a/src/reprostim/cli/cmd_timesync_stimuli.py b/src/reprostim/cli/cmd_timesync_stimuli.py
index cef61aff..aebb29f4 100644
--- a/src/reprostim/cli/cmd_timesync_stimuli.py
+++ b/src/reprostim/cli/cmd_timesync_stimuli.py
@@ -52,9 +52,10 @@
 @click.option(
     "-d",
     "--display",
-    default=1,
-    type=int,
-    help="Specify display number as an integer (default: 1).",
+    default="1",
+    type=str,
+    help="Specify display number as an integer or as X11 format like "
+         ":display_num (default: 1).",
 )
 @click.option(
     "-s",
@@ -111,7 +112,7 @@
     "-t", "--trials", default=300, type=int, help="Specifies number of trials."
 )
 @click.option(
-    "-d",
+    "-x",
     "--duration",
     default=-1,
     type=float,
@@ -140,7 +141,7 @@ def timesync_stimuli(
     output_prefix: str,
     windowed: bool,
     win_size: tuple[int, int],
-    display: int,
+    display: str,
     qr_scale: float,
     qr_duration: float,
     qr_async: bool,
@@ -177,6 +178,8 @@ def timesync_stimuli(
     logger.debug(f"    qr async   : {qr_async}")
     logger.debug(f"    interval   : {interval}")
 
+    display_num: int = int(display.lstrip(':'))
+
     output: str = get_output_file_name(output_prefix, start_ts)
     logger.debug(f"    output     : {output}")
 
@@ -192,7 +195,7 @@ def timesync_stimuli(
         output,
         is_fullscreen,
         win_size,
-        display,
+        display_num,
         qr_scale,
         qr_duration,
         qr_async,
diff --git a/src/reprostim/qr/timesync_stimuli.py b/src/reprostim/qr/timesync_stimuli.py
index 75262d6c..1ee9369f 100644
--- a/src/reprostim/qr/timesync_stimuli.py
+++ b/src/reprostim/qr/timesync_stimuli.py
@@ -484,9 +484,10 @@ def wait_or_keys(
 
     if win.monitor:
         logger.info(f"display [{display}] info:")
+        fr = win.getActualFrameRate()
         logger.info(
             f"    {win.size[0]}x{win.size[1]} px, "
-            f"{round(win.getActualFrameRate(), 2)} Hz"
+            f"    {round(fr, 2)} Hz" if fr else "    N/A Hz"
         )
 
     # log script started event
diff --git a/tools/ci/test_reprostim_events.sh b/tools/ci/test_reprostim_events.sh
new file mode 100755
index 00000000..2b88bc90
--- /dev/null
+++ b/tools/ci/test_reprostim_events.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+# Script to simulate pulse events using xdotool
+# Usage: ./test_reprostim_events.sh NUM_SERIES SERIES_INTERVAL NUM_EVT EVT_INTERVAL [SLEEP_DELAY] [DISPLAY]
+# Make sure to set DISPLAY if using Xvfb
+
+NUM_SERIES="$1"
+SERIES_INTERVAL="$2"
+NUM_EVT="$3"
+EVT_INTERVAL="$4"
+SLEEP_DELAY="${5:-0}"
+DISPLAY_PARAM="$6"
+
+# Use passed-in DISPLAY if provided
+if [[ -n "$DISPLAY_PARAM" ]]; then
+  export DISPLAY="$DISPLAY_PARAM"
+fi
+
+echo "DISPLAY is set to: $DISPLAY"
+
+sleep "$SLEEP_DELAY"
+
+# Validate inputs
+if [ -z "$NUM_SERIES" ] || [ -z "$SERIES_INTERVAL" ] || [ -z "$NUM_EVT" ] || [ -z "$EVT_INTERVAL" ]; then
+  echo "Usage: $0 <number_of_series> <series_interval> <number_of_events> <events_interval> [<sleep_delay>] [<display>]"
+  exit 1
+fi
+
+start_time=$(date +%s)
+
+for (( series=1; series<=NUM_SERIES; series++ )); do
+  echo "Starting series $series"
+  for (( event=1; event<=NUM_EVT; event++ )); do
+    echo "Sending pulse event $series.$event"
+    xdotool key 5
+    sleep "$EVT_INTERVAL"
+  done
+
+  if [ "$series" -lt "$NUM_SERIES" ]; then
+    echo "Waiting $SERIES_INTERVAL seconds before next series..."
+    sleep "$SERIES_INTERVAL"
+  fi
+done
+
+# Escape and quit the application
+echo "Finishing up and send ESC q ESC..."
+xdotool key Escape
+sleep 0.2
+xdotool key q
+sleep 0.2
+xdotool key Escape
+
+end_time=$(date +%s)
+dt=$(( end_time - start_time ))
+
+echo "Done. Execution time: $dt seconds"