About xrandr and DISPLAY=:0.0 (a workaround on 5.24)

BernoO

So, before we're back to the (good ol') forum, i was asking about how can i set or test resolutions with xrandr, if...

export DISPLAY=:0.0

...don't work on F3 tty. I was trying with this and all i can obtain was

No protocol specified
Can't open display :0.0

Reading, it was probably a user permission issue (but we're running root! WTF.), so after burning my brain up, i give up with a solution: Calling xterm from PCmanfm

After Batocera boots, press F1 for bring PCmanfm. On "Edit" menu, press "Preferences". Select "advanced" menu. There's a white line on "Programs" for "Terminal Emulator". Here, write "xterm" without the quotes. Press "close" button. Then, on "Tools" menu, select "Open Current Folder in Terminal". Et voila! A white screen with...

sh-4.4#

...will appear. Thats it. Since we're working on the graphical side of things, xrandr will work directly.

By the way, on my 2 laptops with 5.24, when manually select the Video Output from ES (with intel's HD 3000 and HD 4000 at least), after reboot, output doesn't change. Stays in LVDS1...so! On your new and shiny xterm window...

cp /etc/X11/xinit/xinitrc ~/.xinitrc
cd system
leafpad .xinitrc

And on the xrandr lines you have to specify what output you want and the resolution (or set the modes supported)...an example:

xrandr --output XXX --mode AAAxBBB

Being XXX your output of choice and AAAxBBB the resolution available. And if you have any issues on laptop, better deactivate LVDS1. Put this line before the output assigned...

xrandr --output LVDS1 --off

This will switch off the laptop's internal display. If by any chance you have to makes changes (because you disconnect the output, for example...), call tty from F3 (Alt+Ctrl+F3) and make changes from there (editing .xinitrc with nano)

Cheers and happy holidays!

quatious

Hi, thank you for this awesome post, it put me in the right direction as I was having the same problem. Prior to 5.24 I could set 'HDMI1' as my display output in ES & it worked fine. My scenario is a laptop with Intel HD4000 graphics connected via HDMI to a TV. I'm putting my notes here for anyone else.
1. Go into PCmanfm with F1 key and start an xterm as described
2. Run xrandr by itself to get a list of displays. In my case with Intel graphics I had 2 connected displays, 'eDP1' which is the laptop screen and 'HDMI1' which is the connected TV
3. Copy over .xinitrc as described, cd into /userdata/system
4. vi .xinitrc, in the Customizations section I needed to add the below 2 lines:
xrandr --output HDMI1 --mode 1920x1080 --primary
xrandr --output eDP1 --off
5. Save that and reboot, it worked!
6. For audio - I was able to select HDMI0 in ES which has worked in the past, it worked fine

BZZ

You can also connect via network, name the old file something like .xinitrc_old, create a new .xinitrc with what you need and done ;-) This way you have the non edited file as backup and you play as much as you like with the new one! 🙂