tvservice not able to change resolution on the fly

[thd79]

Using a Pi3b+, GertVGA666 and the latest Retropie, I am unable to get my Pi to change screen mode on the fly. In the past I've been able to do this. Now, it doesn't work. If I go to the console and type

vcgencmd hdmi_timings 1280 1 0 101 110 896 1 13 10 25 0 0 0 60 0 84450240 1
tvservice -e "DMT 87"

I get the error

[E] Failed to power on HDMI with explicit settings (DMT mode 87).

When I type:

tvservice -m DMT

..it lists zero modes. This has definitely worked in the past for me, has support for it been removed recently? The same settings work fine when specified at boot time.

[mitu]

@thd79 said in tvservice not able to change resolution on the fly:

This has definitely worked in the past for me, has support for it been removed recently? The same settings work fine when specified at boot time.

The tvservice and support for video mode switching are not part of RetroPie, but a Raspbian/Kernel+firmware feature - it was certainly not removed in RetroPie. What does 'in the past' mean ? 1 year, 1 week, etc. , before doing any kernel/firmware updates, using a certain RetroPie version maybe ?

What version of RetroPie are you running (specifically) and how it was installed ? Can you post your config.txt configuration file ?