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Old 01-22-2020, 07:14 AM   #1
arfon
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SARPI (fatdog) on RPi4 - no HDMI video [SOLVED]


When I booted the RPi4 from the newly "xc"'d sdcard there was no HDMI video. The fix was to uncomment the following two lines in config.txt (in the mmcblk0p1 partition):

Code:
 # Uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

# Uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

After installing SARPI and rebooting, again, no HDMI video... Again, the fix was to uncomment the same two lines in /boot/config.txt

Last edited by arfon; 01-22-2020 at 08:27 AM.
 
Old 01-22-2020, 03:38 PM   #2
Exaga
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Registered: Nov 2012
Distribution: Slackware [ARM]
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Quote:
Originally Posted by arfon View Post
When I booted the RPi4 from the newly "xc"'d sdcard there was no HDMI video. The fix was to uncomment the following two lines in config.txt (in the mmcblk0p1 partition):

Code:
 # Uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

# Uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

After installing SARPI and rebooting, again, no HDMI video... Again, the fix was to uncomment the same two lines in /boot/config.txt
OK cool. Thanks for this. I will certainly bear it in mind and if any other Slackers have the same experience as you then it'll become an issue to address. I've not had any problems of the kind you've described with Slackware ARM current on the RPi4. In fact, much the opposite.
 
Old 01-22-2020, 09:59 PM   #3
TheTKS
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Registered: Sep 2017
Location: The deep south... of Canada
Distribution: Slackware, Xubuntu, OpenBSD, elementary, Raspberry Pi OS, Puppy, TinyCore
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Quote:
Originally Posted by Exaga View Post
OK cool. Thanks for this. I will certainly bear it in mind and if any other Slackers have the same experience as you then it'll become an issue to address. I've not had any problems of the kind you've described with Slackware ARM current on the RPi4. In fact, much the opposite.
No problems here with HDMI video. Haven’t tried audio.

Last edited by TheTKS; 01-23-2020 at 01:02 PM.
 
1 members found this post helpful.
Old 03-16-2020, 02:17 AM   #4
arfon
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Registered: Apr 2004
Location: Texas
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No HDMI output on RPi4 (why and fix)

I found out WHY the HDMI video doesn't work on some installs....

If you use an OLD monitor (or a TV) for the install, they may not be able to handle the high default resolution of the RPi4. When this is the case, the monitor just shows a black or a "no input signal" screen.

You can fix this by changing monitors -OR- changing the config file as I described in the first post.

Last edited by arfon; 03-16-2020 at 02:18 AM.
 
1 members found this post helpful.
Old 03-17-2020, 01:47 AM   #5
Exaga
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Registered: Nov 2012
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Quote:
Originally Posted by arfon View Post
I found out WHY the HDMI video doesn't work on some installs....

If you use an OLD monitor (or a TV) for the install, they may not be able to handle the high default resolution of the RPi4. When this is the case, the monitor just shows a black or a "no input signal" screen.

You can fix this by changing monitors -OR- changing the config file as I described in the first post.
Sure thing. This happens when the video mode of the screen display cannot match the video mode that the RPi is using. It's a known quantity and can usually be fixed by altering one's /boot/config.txt settings to operate on a lower/lesser level. Part of the fun in getting things to work in Slackware ARM is solving issues such as these. Although, this is not a Slackware ARM [or SARPi] issue. It's all down to the capabilities of the screen display that you're using.

I generally try to connect via ssh when there's no expected display, and if that is working OK I then look at the video mode(s), then cables, etc.
 
  


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