HDMI-2-VGA unable to set resolution

[0zzy]

Hi all, i'm going on with my bartop+recalbox project. I have found a dvi monitor so i have bought an hdmi2vga adapter and a vga2dvi adapter. I had to modify my /boot/config.txt becouse video after a few minutes started do loose monitor signal ang goes black This is my /boot/config.txt:

# uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1
 
disable_overscan=1
 
# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=51
 
# comment to get jack audio
hdmi_drive=2
 
config_hdmi_boost=4
hdmi_force_hotplug=1
 
# uncomment for composite PAL
#sdtv_mode=2
 
# Overclock
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512
 
avoid_safe_mode=1
 
kernel=zImage
 
# NOOBS Auto-generated Settings:
hdmi_force_hotplug=1
config_hdmi_boost=4
overscan_left=24
overscan_right=24
overscan_top=16
overscan_bottom=16
disable_overscan=0
arm_freq=1050
core_freq=525
sdram_freq=480
force_turbo=0
over_voltage=4
over_voltage_sdram=2
gpu_freq=350

With this settings video is stable an monitor does not loose signal anymore. My tvservice output:

Group CEA has 5 modes:
mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive
mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive
mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive
(native) mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

Group DMT has 13 modes:
(prefer) mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive
mode 7: 640x480 @ 85Hz 4:3, clock:36MHz progressive
mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive
mode 12: 800x600 @ 85Hz 4:3, clock:56MHz progressive
mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive
mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive
mode 19: 1024x768 @ 85Hz 4:3, clock:94MHz progressive
mode 32: 1280x960 @ 60Hz 4:3, clock:108MHz progressive
mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive
mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive
mode 37: 1280x1024 @ 85Hz 5:4, clock:157MHz progressive
mode 51: 1600x1200 @ 60Hz 4:3, clock:162MHz progressive

And my recalbox.conf

# ------------ H - HERE IT IS - GLOBAL EMULATOR CONFIGURATION ------------ #
## The global value will be used for all emulators, exept if the value
## is redifined in the emulator
## Set game resolution for emulators
## select your mode from the command : tvservice -m [MODE]
## CEA 5 HDMI : 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced 
## CEA 4 HDMI : 1280x720 @ 60Hz 16:9, clock:74MHz progressive
## use 'default' for using the default resolution
## (string)
#global.videomode=CEA 4 HDMI
global.videomode=DMT 51 HDMI

As you can see i have tried to set resolution to 16001200 but no changes from the default 640480. Is it right to specify "global.videomode=DMT 51 HDMI" ? My second questions: if i run every emulator, black borders are present and the image is little bit streched, how can i set 4:3 on full screen?

[ironic]

Is your monitor really 1600*1200 ? Try this : (config.txt) hdmi_group=2 hdmi_mode=35 hdmi_drive=2 config_hdmi_boost=0 hdmi_force_hotplug=0 gpu_mem_256=128 gpu_mem_512=256 gpu_mem_1024=512 avoid_safe_mode=1 kernel=zImage hdmi_force_hotplug=1 config_hdmi_boost=4 overscan_left=0 overscan_right=0 overscan_top=0 overscan_bottom=0 disable_overscan=1 And (recalbox.conf) ## global.videomode=CEA 4 HDMI global.videomode=DMT 35 HDMI

[0zzy]

Hi ironic, yes my monitor HP LP2065 can work @ resolution of 1600x1200. I have found the problem, i must to enable hdmi_safe=1 on /boot/config.txt otherwise i'll get a black monitor = signal missing.

Setting up hdmi_safe=1 is equal to set all this:
hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
config_hdmi_boost=4
hdmi_group=2
hdmi_mode=4
disable_overscan=0 

and exactly the resolution i have is only @640x480 (hdmi_group=2 hdmi_mode=4). I have read this here: http://elinux.org/RPiconfig#Video_mode_options So..i have to let hdmi_safe=1, but if i try to specify other hdmi_mode (ex: 51) in boot.cfg and recalbox.conf, this is parameter is ignored, and i always have a resolution of @640x480

[0zzy]

these are my monitor specs http://www8.hp.com/h20195/v2/getpdf.aspx/c04142050.pdf?ver=15 i have partially resolved in this way: hdmi_safe=0 hdmi_force_hotplug=1 hdmi_ignore_edid=0xa5000080 config_hdmi_boost=4 hdmi_group=2 hdmi_mode=35 disable_overscan=0 monitor signal is "stable", but i cant set hdmi_mode Greater than 35 otherwise monitor signal go up and down.. could it depends by my hdmi2vga converter?