Comet KVM (GL-RM1) - No HDMI signal detected | Hardware failure (chipid err 0x0, probe failed -22, empty i2cdetect) - Already emailed CS for RMA

KVM
1

Hi GL.iNet team and community,

I'm experiencing the "No HDMI signal detected" issue on my Comet KVM (GL-RM1). The HDMI source works perfectly when connected directly to a regular monitor, but the Comet shows no signal in the web interface. Mouse/keyboard passthrough works fine, but video is completely absent.

I've followed troubleshooting steps from the docs and several forum threads (like "New Comet KVM - No HDMI Signal Detected", "Comet KVM - No HDMI Signal Detected", "Blank screen - unable to change EDID after upgrade", etc.), including:

  • Trying different HDMI cables and ports
  • Forcing standard resolutions (1920x1080@60Hz, etc.)
  • Reboots, power cycles, etc.

But the diagnostics point to a hardware problem with the LT6911C chip.

Key logs via SSH:

  1. dmesg | grep 6911:

[ 0.485536] lt6911c 1-002b: version: v1.0.1
[ 0.485569] lt6911c 1-002b: driver version: 00.01.03

[ 7.330995] lt6911c 1-002b: chipid err, read:0x0, expect:0x516
[ 7.331140] lt6911c 1-002b: Dropping the link to regulator.3
...
[ 7.331547] lt6911c: probe of 1-002b failed with error -22

  1. i2cdetect -y 1 (completely empty – no device detected at 0x2b or anywhere):

0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- --

I also tried downgrading firmware to 1.4.2 (and others) using updateEngine, but it failed with signature/image read errors (md5 not supported, can't read update.img, analyticImage error).

These logs match several forum reports (e.g., "chipid err read:0x0 expect:0x516", probe failed -22, and failed lt6911c_upgrade with "no found lt6911c device") where it was concluded as hardware failure of the LT6911C chip.

I've already sent a detailed email to cs@gl-inet.com today (February 22, 2026) with these exact logs, purchase details, and a request for expedited warranty replacement (including advanced/cross-ship option since I no longer have the original box). I'm a big fan of GL.iNet – I also have the Comet Pro with Wi-Fi and it's working flawlessly!

In the meantime, has anyone resolved a similar "chipid 0x0 + empty i2cdetect" issue without RMA? Or any additional diagnostics I can run?

Thanks in advance for any help or staff input – really appreciate the great products and support!

Best regards,

jortizm
emailed CS today

2

Contact our after-sales department and have them send you a replacement.

4

Hi everyone / @GL.iNet support team,

I just wanted to share my recent experience and say a huge THANK YOU to the GL.iNet support team!

I had a hardware issue with one of my devices (no signal detected, suspected chip failure). The support was incredibly fast and professional: they asked for the right details, approved the RMA quickly, sent a replacement unit promptly (even before receiving the faulty one in some cases), and fully reimbursed the return shipping costs via PayPal without any hassle.

Everything arrived in perfect condition and is working flawlessly now. Communication was clear, friendly, and super efficient from start to finish—really outstanding customer service.

I already own several GL.iNet products (travel routers, 4G models, etc.) and I'm very happy with all of them: reliable hardware, excellent OpenWrt-based firmware, great VPN support, and they just work. This positive experience only confirms why I keep choosing GL.iNet.

I'll definitely continue buying from you in the future—highly recommended!

Thanks again to the team for the great support. Keep up the fantastic work!

Best regards

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