Hello,
I got GL-RM10 from Kickstarter, It works great (upgrade from my previous backing RM1) however i am facing an issue when I need to wake up my (new) Mini PC Geekom A9 MEGA from sleep state.
I confirm that i don't have any wake up issue without the RM10 plugged).
The connection is currently like this:
A9 MEGA HDMI1 out > RM10 HDMI in
RM10 HDMI out > Viewsonic 24inch 1080p HDMI in
(So yes, i use the HDMI passthrough feature)
So to put my A9 MEGA in sleep mode, i just press the power button (Windows 11 25H2 - Fast Startup disabled, and as mentioned, no issue without RM10 plugged/used)
When it is in sleep mode, the power white LED is blinking, all good, and I can see on the RM10 screen that HDMI IN status and Keyboard / mouse status are off.
Then if i press a key on my keyboard or move my mouse, i can see that the A9 MEGA is awake as the fans are spinning louder on waking up. However I got a black screen and I cannot do anything else, nothing is responding, i have no choice to hold the power button for 10sec to force shutdown.
FYI… I asked AI … So I suspect the issue is related to RM10 EDID using passthrough since i don't have issue without it…. I confirmed I did all the actions below.. no difference.. Here the output:
Looking at the specific documentation for the RM10 (GL-KVM), the EDID settings are found under **Settings > Video > EDID**.
Since you don't see a "Fixed" toggle, the RM10 likely uses a **"Copy" or "Sync"** method. The goal is to make the RM10 "pretend" to be your monitor even when the Geekom is asleep, so that when it wakes up, the HDMI handshake is already "waiting" for it.
Here is the step-by-step fix for the Geekom A9 "Wake-to-Black-Screen" issue:
### 1. Force the EDID on the RM10
If the RM10 is set to "Default" or "Auto," it might be dropping the connection when the Geekom sleeps.
1. Log into the RM10 web console.
2. Go to **Settings > Video > EDID**.
3. Look for a button that says **"Copy EDID from Monitor"** or **"Sync."**
4. If there is a list of resolutions, **do not leave it on "Default."** Select the specific resolution of your monitor (e.g., `1920x1080@60Hz` or `2560x1440@60Hz`).
5. This forces the RM10 to keep that specific identity active, preventing the Geekom from "losing" the monitor during sleep.
### 2. Disable PCI Express Link State Power Management (Crucial)
On Geekom and Ryzen-based systems, the HDMI port is often tied to the PCIe bus. If Windows puts the PCIe link into a "deep sleep," it often fails to re-initialize the HDMI clock when the PC wakes up, resulting in that solid white LED but no video.
1. In Windows, search for **Edit Power Plan**.
2. Click **Change advanced power settings**.
3. Find **PCI Express** > **Link State Power Management**.
4. Set it to **Off**.
5. Click Apply.
### 3. Disable Windows "Fast Startup"
This is a notorious cause for "Black Screen on Wake" because it doesn't fully refresh the kernel or drivers when the system transitions between power states.
1. Search for **Control Panel** > **Power Options**.
2. Click **"Choose what the power buttons do"** on the left.
3. Click **"Change settings that are currently unavailable"** at the top.
4. **Uncheck** "Turn on fast startup (recommended)."
5. Save changes.
### 4. The "Win + Ctrl + Shift + B" Test
Next time you wake the Geekom and get a black screen (with the solid white LED):
* Press **Win + Ctrl + Shift + B** on your keyboard.
* The PC will beep and the graphics driver will force a restart.
* **If the video comes back:** The problem is the AMD Graphics driver failing to wake up. (Fix: Update/Reinstall the AMD Adrenalin drivers).
* **If the video stays black:** The problem is the HDMI handshake at the hardware level (The RM10/Cable).
### 5. Check "USB Wake Support" in BIOS
Even though your keyboard *is* waking the PC (the LED turns solid), the BIOS might not be fully "handing over" the wake signal correctly to the operating system's video driver.
1. Enter BIOS (Tap **Del** during startup).
2. Go to **Advanced** > **ACPI Settings**.
3. Ensure **USB Wake from S3/S4** is **Enabled**.
4. Look for **"Deep S5"** or **"ErP"** and ensure it is **Disabled**. (Deep S5 cuts off too much power, which often breaks the HDMI path for KVMs).
**Why the LED stays "Solid White":**
The Geekom *thinks* it is fully awake. The processor and RAM are running, but the HDMI controller hasn't "shaken hands" with the RM10. By disabling the **PCI Link State Power Management (Step 2)**, you keep the HDMI controller's "brain" alive even while the PC sleeps, which usually solves this exact problem.
