dosbox resolution detection

[andreas99]

Hello,

I put some effort to get my old DOS games running with RetroPie. I tried the libretro variant, but wasn't satisfied with the speed and went on with dosbox binary.

But I've some problems with correct resolution detection. The speed was very slow and I found some hints to work around this here:
https://retropie.org.uk/forum/topic/25178/dosbox-on-pi-4-game-window-is-fullscreen-but-not-centered-on-screen/67

if I call 'tvservice -e "CEA 1" in the runcommand-onstart.sh script it works. But several games have slightly different resolutions.

So I tried to debug why runcommand.sh doesn't set the correct video mode that I select for this rom. This is the point where I run today:

line ~113 ff:

if [[ -n "$DISPLAY" ]] && $XRANDR &>/dev/null; then
      HAS_MODESET="x11"
  # copy kms tool output to global variable to avoid multiple invocations
  elif KMS_BUFFER="$($KMSTOOL -r 2>/dev/null)"; then
      HAS_MODESET="kms"
  elif [[ -f "$TVSERVICE" ]]; then
      HAS_MODESET="tvs"
  fi

First here the script detects "kms" and not "tvs". This is the reasons later in function mode_switch() it runs into the "kms" elif.

If I add a hard tvservice call short before it works as it should in my hard coded resolution. But if I just change the detection to "tvs" and let the script call it I get an error as tvstation doesn't understand the parameter -e "49 0" or something.

So is here anyone known of the runcommand.sh script and might help me to fix the dosbox use case?

regards
Andreas