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I'm currently trying to set up my Raspberry Pi with ArchLinuxARM. Everything went fine so far but the display has a horribly low resolution, 640x480!
I'm using a HDMI to VGA converter box and an Acer monitor that normally can do a resolution of 1920x1080 @ 60 Hz.
I know this is something that is widely discussed but I already did tons of google research and tried a lot but nothing seems to change anything. My current /boot/config.txt, but I've already tried many different combinations:

hdmi_safe=1
disable_overscan=1
hdmi_group=1
hdmi_mode=16
hdmi_drive=2
config_hdmi_boost=4
sdtv_mode=2
sdtv_aspect=1
hdmi_edid_file=1
## ... and overclocking settings on Turbo, but rather as a test

Also:

$ /opt/vc/bin/tvservice -s
state 0x12001a [HDMI DMT (4) RGB full 4:3], 640x480 @ 60.00Hz, progressive

$ /opt/vc/bin/tvservice -m CEA
mode 4: 1289x720 @ 60Hz 16:9, clock:74MHz progressive
mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

$ /opt/vc/bin/tvservice -m DMT
mode 4: 640x480 @ 60Hz 4:3, clock:25MHZ progressive

When I change framebuffer_width and framebuffer_height to something higher, the text gets smaller but also blurry, like theres no change in resolution but just in font size. I have black bars of about 10% at top, bottom, left and right of the screen, that don't change by changing the overscan attributes in the config.txt, neither with positive nor negative values.
I can login via SSH and change the HDMI mode to CEA 16 DVI with

$ /opt/vc/bin/tvservice --explicit="CEA 16 DVI"

And the output of tvservice -s tells me that the mode is now the status but the monitor of the pi just turns black (different shades of black, depending on what hdmi mode I try) and stays that way. When I change the HDMI mode to 16, and reboot, the messages that appear on the screen actually have the right resolution but it reboots into HDMI mode 4 CEA again.
I've already tried commenting out disable_overscan, using the overscan values, using different HDMI modes (1,4,16,31,32,47,68,69,71,71,72,73 with hdmi_group=2 and 1,4,16 with hdmi_group=1), using /opt/vc/bin/tvservice -d and enable hdmi_edid_file=1, changing sdtv_aspect and choosing different overclocking settings, and now I have the feeling I'm just looking at the wrong place...

I have already set up the raspberry pi with the same setting (at least I thought it would be the same) and the resolution was fine. I don't know what I am doing wrong.

I hope you can help me!

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  • 1
    Are you sure your HDMI->VGA adapter supports 1920x1080? Could you perhaps post a link to the actual adapter you have in your possession?
    – Phil B.
    Commented Jun 19, 2015 at 12:48
  • FWIW - I use an HDMI->VGA adapter which works fine in 1920x1080 without needing to make any config.txt modifications - here is the link to the one I use: amazon.com/gp/product/B00G9UWP94 .
    – Phil B.
    Commented Jun 19, 2015 at 18:56
  • I can't remember which one I bought, but also over amazon and it was a bit cheaper, about 5 Euro. I am sure that my adapter supports it because when I switched the hdmi mode over tvservice and then rebooted I could see the right resolution but only the shutdown messages. But before that the screen was blanking, so I was not able to use any terminal.
    – matkin
    Commented Jun 19, 2015 at 19:38

2 Answers 2

Reset to default
3

So, it works now. It seems to be the solution was to comment out hdmi_safe=1. I tried to disable everything that does not change anything and ended up with this /boot/config.txt:

hdmi_group=2
hdmi_mode=47
hdmi_drive=2

Thanks to everyone who helped!

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2
  • do you mean comment out hdmi_safe=1 or uncomment it? I don't see hdmi_safe=1 in the full config you listed.
    – jaynp
    Commented Sep 4, 2016 at 23:46
  • I commented it out. In the file listed in the question it was uncommented. The file that is listed in the answer is everything that was needed. I didn't write down explicitly which options were also in the file, that I commented out.
    – matkin
    Commented Sep 5, 2016 at 6:07
1

Try adding this to config.txt :

hdmi_force_hotplug=1

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1
  • Tried it - doesn't change anything...
    – matkin
    Commented Jun 20, 2015 at 13:17

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