Dell Laptop does not have HDMI. Laptop is plugged into Dell Dock via USBC. Dell Dock that does have HDMI and that is plugged into GL-RM1PE (Comet PoE). Mouse and keyboard work but getting No HDMI Signal Detected message. Latest firmware installed 1.5.1 installed dated August 2025. Logs attached.
system_logs_20251013_000456.zip (46.4 KB)
[ 6.941337] lt6911c 1-002b: 0xD211 is 0
[ 127.286819] lt6911c 1-002b: Resolution: 2560x1440@60 fps (htotal=2720, vtotal
[ 134.819917] lt6911c 1-002b: 0xD211 is ff
[ 157.879349] lt6911c 1-002b: 0xD211 is 0
[ 444.147406] lt6911c 1-002b: 0xD211 is 0
0xD211 is 0 means chip init
0xD211 is ff means hdmi plugout/no signal
It seems there was only a 7-second display, and then no HDMI signal output was detected. Later, you might have switched the EDID? But still, there was no signal output.
I tried changing EDID to 3840 but that didn’t help either. Basically isn’t working correctly. Is there anyway to get this to work with this configuration where the laptop doesn’t have HDMI output and relying on a dock to get HDMI output?
I also tried a USBC to HDMI Output + USB splitter dongle, same results, No HDMI Signal Detected but mouse and keyboard work.
I have the same issue. Worked great the last month until 2 days ago. No changes were being made when it stopped working. Also connected via usb-c dock. RM1 firmware 1.5.0. Tailscale enabled. Tried connecting via web app and direct ip address.
system_logs_20251013_013408.zip (79.5 KB)
[22989.211797] lt6911c 1-002b: Resolution: 4754x22@46 fps (htotal=131070, vtotal
[22989.211862] lt6911c 1-002b: lt6911c_rcv_supported_res: width and height must
[22989.211882] m00_f_lt6911c 1-002b: lt6911c_get_timing: rcv err res, return no
[22989.410242] lt6911c 1-002b: 0xD211 is ff
[26161.465786] lt6911c 1-002b: Resolution: 1230x10@46 fps (htotal=131070, vtotal
[26161.465836] lt6911c 1-002b: lt6911c_rcv_supported_res: width and height must
[26161.465856] m00_f_lt6911c 1-002b: lt6911c_get_timing: rcv err res, return no
[26161.659509] lt6911c 1-002b: 0xD211 is ff
[26735.270764] lt6911c 1-002b: Resolution: 1004x48@23 fps (htotal=131070, vtotal
[26735.270818] lt6911c 1-002b: lt6911c_rcv_supported_res: unsupported resolution
[26735.270838] m00_f_lt6911c 1-002b: lt6911c_get_timing: rcv err res, return no
[26735.480399] lt6911c 1-002b: 0xD211 is ff
[28026.423668] lt6911c 1-002b: Resolution: 1526x18@23 fps (htotal=131070, vtotal
[28026.423739] lt6911c 1-002b: lt6911c_rcv_supported_res: width and height must
[28026.423767] m00_f_lt6911c 1-002b: lt6911c_get_timing: rcv err res, return no
[28026.619568] lt6911c 1-002b: 0xD211 is ff
From the logs, it appears that the HDMI chip is consistently unable to acquire the correct resolution. This could be related to the graphics driver of the controlled computer, especially when the controlled computer is running a Linux system.
The controlled computer for my setup is a Windows system and was working for the past month prior. So this is not due to faulty dock, hdmi cable, and usb-c cable right?
Maybe you can try replacing an EDID and see.
I’ve tried all the EDIDs provided by GLinet and have also tried downgrading to 1.4.2 and 1.3.1
My issue is resolved. Sorry for hijacking post! The controlled PC was powered off. Manually turned on controlled PC as finger bot fell off alignment
Both host and client are running Windows. I tried all EDID available. Tried both the software app. and through Chrome browser.
Is it work if you plug in a monitor?
Yes, when Monitor is plugged into Dock’s HDMI output and Laptop is plugged into Dock, display works fine.
Model of the dock if it helps:
Dell Pro Smart Dock SD25
Tried on a Dell Precision 3460 which also only has Displayports / no native HDMI.
Purchased an active Displayport to HDMI adapter (Amazon.com: Plugable Active DisplayPort to HDMI Adapter, Uni-Directional, Driverless, Adapts Any Full-Sized DP Port to Enable Connecting a HDMI Cable and Display up to 4K 3840x2160 @60Hz : Electronics) and similar issues. Sometimes Comet will show the display, sometimes no signal. So far my experience is for devices without HDMI natively, Active Displayport to HDMI adapters, USBC DP to HDMI adapters, and Docks that contain HDMI don’t seem to work with GL-RM1PE. Is this commonly known? I’ve checked posts from others running GL-RM1 and they seem to have more luck with Displayport adapters.
Can you provide debug log agian? when using this dp to hdmi apdapter
glkvm_device_log.zip (56.6 KB)
Log from Precision 3460 plugged into DP to HDMI adapter, then to HDMI cable to KVM
Progress made on Precision 3460 plugged into DP to HDMI adapter… I think I have it stable and working now. This is my fault. This Precision 3460 does not have USBC in the back of case. To keep the cables tidy, I used a USBC to USBA adapter (more adapters:). The computer in general didn’t seem to like this KVM USBC cable to USBA adapter plugged in. The OS would not post hence no HDMI probably.
When I removed the KVM from the picture and used actual kb\mouse\monitor (Via DP to HDMI), it always booted just fine.
I removed the USBC cable to USBA adapter from the equation, used an actual USBC to USBA cable I had lying around and now display is working as well as kb\mouse.
Will be busy so can’t troubleshoot the laptop dock situation but I do at least have a working computer I can use this KVM for.