NO SIGNAL but keyboard and mouse are working

Hi @michael ,

Just got my Voyager 2 around two weeks ago, great product btw.

I have found an issue similar with @bakabonpapa,
In my case, try to remote control with Dell laptops, when I tried to go into bios mode, enter delete/F12, with the Dell laptop it can enter the bios mode but on the tinypilot web interface it always shows up "no signal" (mouse and keyboards still works), after the laptop run into login screen it was able to capture the video by doing nothing. I have tried it on two models of Dell laptop 7420/7390.

Please kindly advise how to solve.

Thanks!

@Herry - Thanks for reporting this. Sorry about the trouble here.

Some laptops refuse to show the BIOS screen on an external display. Other laptops can show BIOS on an external display, but you have to change the laptop's BIOS options to enable it.

• Are there any BIOS options that control displaying to an external monitor?
• If you connect the laptop to a regular monitor and enter BIOS, does the BIOS screen show up on the monitor?

Hi Michael,

Thank you for your comment.

At first may I know how to restore the original "tc358743-edid.hex.bak" file, I accidently no backup the origin file run the follow command,

 readonly EDID="/home/ustreamer/edids/tc358743-edid.hex"
echo -ne "" | sudo tee "${EDID}" && \
  echo '00ffffffffffff0052628888008888882d1e0103' | sudo tee -a "${EDID}" && \
  echo '800000780aee91a3544c99260f50542540000100' | sudo tee -a "${EDID}" && \
  echo '0100010001000100010001010101d51b00505000' | sudo tee -a "${EDID}" && \
  echo '19400820b80080001000001eec2c80a070381a40' | sudo tee -a "${EDID}" && \
  echo '3020350040442100001e000000fc00546f736869' | sudo tee -a "${EDID}" && \
  echo '62612d4832430a20000000fd00323d0f2e0f0000' | sudo tee -a "${EDID}" && \
  echo '000000000000012a02030400de0d20a030581220' | sudo tee -a "${EDID}" && \
  echo '30203400f0b400000018e01500a0400016303020' | sudo tee -a "${EDID}" && \
  echo '3400000000000018b41400a050d0112030203500' | sudo tee -a "${EDID}" && \
  echo '80d810000018ab22a0a050841a3030203600b00e' | sudo tee -a "${EDID}" && \
  echo '1100001800000000000000000000000000000000' | sudo tee -a "${EDID}" && \
  echo '0000000000000000000000000000000000000000' | sudo tee -a "${EDID}" && \
  echo '00000000000000000000000000000045' | sudo tee -a "${EDID}" && \
  sudo v4l2-ctl --device=/dev/video0 --set-edid=file="${EDID}" --fix-edid-checksums

sudo cp ~/tc358743-edid.hex.bak "${EDID}"

when I tried to run the command you provide shows : No such file or director
and the resolution now shows wired I guess is 1024*768, I wish to restore it back can you help on this?

According to your advise, I have tried it on external monitor and it works via using Fn + F8 to switch the display, then I found a similar topic Pre-boot display output on laptops, how to trigger ,
same with @hicktastic results push Fn+F8 in TinyPilot, the JavaScript key translation for this combination is MediaStop and TinyPilot won't send it (shows up in red). So I'm wondering is there any update on this.

Here's my logs https://logs.tinypilotkvm.com/13E9zaM5

Thanks!

You can run this command to restore the default EDID:

EDID="/home/ustreamer/edids/tc358743-edid.hex"
echo "00ffffffffffff005262888800888888
2d1e0103800000780aee91a3544c9926
0f505400000001010101010101010101
010101010101011d007251d01e206e28
5500c48e2100001e8c0ad08a20e02d10
103e9600138e2100001e000000fc0054
6f73686962612d4832430a20000000fd
003b3d0f2e0f1e0a2020202020200135
020321434e041303021211012021a23c
3d3e1f2309070766030c00300080e300
7f8c0ad08a20e02d10103e9600c48e21
0000188c0ad08a20e02d10103e960013
8e210000188c0aa01451f01600267c43
00138e21000098000000000000000000
00000000000000000000000000000000
00000000000000000000000000000028" | sudo tee "${EDID}"

According to your advise, I have tried it on external monitor and it works via using Fn + F8 to switch the display, then I found a similar topic Pre-boot display output on laptops, how to trigger ,
same with @hicktastic results push Fn+F8 in TinyPilot, the JavaScript key translation for this combination is MediaStop and TinyPilot won't send it (shows up in red). So I'm wondering is there any update on this.

The Fn key varies by keyboard, so hitting Fn+F8 on your client machine (where you're viewing TinyPilot in the browser) is not necessarily the same as hitting Fn+F8 on your laptop. Can you share a photo of what the F8 key looks like on your laptop?

Hi Michael,

Thanks for your prompt response!

I'm able to get it back at normal resolution.

Here's the keyboard image same as Dell 7420

Thnaks,
Herry

Okay, I have a Dell laptop here with a similar button. I'm going to try to capture the HID code to see if I can get a workaround for you, but I won't be able to set it up until next week.

@Herry - I unfortunately wasn't able to find a way to get TinyPilot to send this key. I'm not sure it's possible for external keyboards to even send this key, as I don't see it documented in the USB spec for keyboards. I've filed a bug to investigate:

• TinyPilot can't send KEY_SWITCHVIDEOMODE

If this breaks the scenario you had in mind for your Voyager 2, please shoot the team an email at support@tinypilotkvm.com and we'll find a fair resolution for you.

Hi Michael,

First of all, thank you for your comments and suggestions,
For your information I did tried it with a external keyboard connect it with the Dell laptop, and it don't work.

Thanks, I still try digging more possibility on this great products, so for now not consider return it.
In the meantime, I'll keep following on your investigate topic, hopes to hear the good news soon.

Thanks,
Herry