LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Distributions > Slackware > Slackware - ARM
User Name
Password
Slackware - ARM This forum is for the discussion of Slackware ARM.

Notices


Reply
  Search this Thread
Old 04-29-2018, 02:41 PM   #1
glorsplitz
Member
 
Registered: Dec 2002
Distribution: slackware!
Posts: 565

Rep: Reputation: 114Reputation: 114
hdmi dongle to vga monitor, doesn't wake up


Hi I have Slackware ARM -current on a Raspberry Pi 3, up to date.

When I boot up the vga lcd monitor displays fine.

I have two other computers I use the monitor for. If I disconnect from the rpi3 to one of the other computers then back to the rpi3, the monitor is like in sleep.

I ssh to the rpi3 to do things so I don't use the monitor, just wondering if there's anything to get it turn on when reconnecting to the rpi3.

Thanks
 
Old 04-29-2018, 05:02 PM   #2
Penthux
Member
 
Registered: Dec 2008
Location: Middlesbrough, UK
Distribution: Slackware
Posts: 222

Rep: Reputation: 65
Quote:
Originally Posted by glorsplitz View Post
I ssh to the rpi3 to do things so I don't use the monitor, just wondering if there's anything to get it turn on when reconnecting to the rpi3.
I have an Iiyama LCD screen that does exactly the same thing. If it isn't connected to the computer when you boot it there's no way in hell you're ever going to get anything more than a "no signal" error message on the screen. Other screens I can unplug and reconnect them all day long and they work fine. Perhaps your monitor has the same affliction as my Iiyama.
 
Old 04-29-2018, 06:24 PM   #3
glorsplitz
Member
 
Registered: Dec 2002
Distribution: slackware!
Posts: 565

Original Poster
Rep: Reputation: 114Reputation: 114
Hi Penthux

Thanks, this Dell monitor is small and fits neat in the area I need it. I tried a larger Acer and still no signal, oh well.
 
Old 04-29-2018, 07:11 PM   #4
glorsplitz
Member
 
Registered: Dec 2002
Distribution: slackware!
Posts: 565

Original Poster
Rep: Reputation: 114Reputation: 114
Just found this

Quote:
You might also need to set config_hdmi_boost=4 or even higher (up to 9) if your display needs a stronger signal.
Added this to /boot/config.txt, will see what happens next reboot, will post back.
 
Old 04-30-2018, 02:11 AM   #5
Penthux
Member
 
Registered: Dec 2008
Location: Middlesbrough, UK
Distribution: Slackware
Posts: 222

Rep: Reputation: 65
Quote:
Originally Posted by glorsplitz View Post
Just found this

Added this to /boot/config.txt, will see what happens next reboot, will post back.
Does the screen in question work as expected when you're unplugging it and reconnecting it to a system that's not the RPi? Or is this problem only apparent on the RPi?

<edit> Just a thought; the RPi is set to use HDMI by default. You can force it to use HDMI even when there's no screen cable detected. It might be worth trying this in your config.txt file:

Code:
hdmi_force_hotplug=1
hdmi_drive=2

Last edited by Penthux; 04-30-2018 at 02:22 AM. Reason: what would you use as a reason?
 
Old 04-30-2018, 06:55 PM   #6
glorsplitz
Member
 
Registered: Dec 2002
Distribution: slackware!
Posts: 565

Original Poster
Rep: Reputation: 114Reputation: 114
Thanks for follow up Penthux.

This happens only with reconnecting to the rpi3 and I have those two lines uncommented in config.txt, and this happens only if I disconnect from the rpi3. I've had the monitor connected a few days and have been able to wake it up.

The hdmi dongle to vga has an audio connector I have a pair of speakers connected to using soma to listen to net radio.

So I thought the link in my previous post said "the Pi outputs a relatively weak HDMI signal", I thought maybe the audio connector might have something to do with the hdmi output, I stopped soma, waited a minute and tried to wake up the monitor, didn't work.

As I said, I'll see what happens next reboot with "config_hdmi_boost=4", probably the hdmi output has nothing to do with the audio connector output power wise.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Dual monitor HDMI and VGA frushiyama Slackware 29 04-09-2018 07:47 AM
Dell XPS M1330 HDMI and VGA as external monitor Flowaone Linux - Laptop and Netbook 1 03-02-2017 01:28 PM
Intel Graphics - Image on monitor not correct using HDMI, VGA works fine. rrrssssss Linux - Hardware 3 05-20-2013 03:33 AM
Converting HDMI computer output to VGA monitor input JMJ_coder Linux - Hardware 3 12-31-2010 01:41 PM
Monitor doesn't wake up after stanby and battery monitor problems (tm) Linux - Laptop and Netbook 2 03-23-2004 06:34 AM

LinuxQuestions.org > Forums > Linux Forums > Linux - Distributions > Slackware > Slackware - ARM

All times are GMT -5. The time now is 06:45 PM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration