Hi, I am currently testing Batocera Linux for retrogaming with 15KHz output on CRT / TV.
The machine I discovered is a certified Windows Media Center / Intel ViiV machine: Acer iDEA 510
It features:
RCA component output
S-Video CVBS output
S-Video DIN output
Scart IN / Scart OUT (two DVB-T tuners for realtime playback and recording)
DVI-I out
HDMI out
Laptop style components, MXM module Geforce 7 Go 7600 (NVIDIA Curie).
Now, BIOS default output via RCA component is 640x480 NTSC (480i, 60Hz). In Windows I can switch between NTSC and PAL (480i or 576i).
As this is EU machine, after BIOS it often defaults to 576i PAL, unless set otherwise.
Now your nouveau driver therefore defaults to 576i.
Xrandr looks like this:
TV-1 connected 640x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
720x576 50.00 +
1024x768 50.00
800x600 50.00
720x480 50.00
640x480 50.00*
400x300 50.00
320x240 50.00
320x200 50.00
768x576 50.00
360x200 60.00
360x240 60.00
640x240 60.00
720x576 50.00 +
1024x768 50.00
800x600 50.00
720x480 50.00
640x480 50.00*
400x300 50.00
320x240 50.00
320x200 50.00
768x576 50.00
360x200 60.00
360x240 60.00
640x240 60.00
I tried to add some additional modelines. But look at 640x480. It forces 50Hz and I am unable to remove it, create new or change it to 60Hz. Therefore the TV is always set to 576i and screen output is 640x480, therefore it looks like GPU scaled. First I read your troubleshooting which mentions scaling, so I tried to disable scaling. Did not help.
Now I read about this:
And this might be the solution and issue. It would correspond with what can be observed in Windows 7.
Does your driver have some options for configuring TV Out and name switching from PAL to NTSC or HD480i mode? It should be automatic based on 480i or 576i or 240p or 288p, but it is not.
Thanks,
Lukas
