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GroovyArcade live-CD 2020

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lettuce:
Calamity ive been reading your guide on install on a usb drive, and noticed your warning on the 31khz display on boot up, is this only when your first setting groovymame live cd up, or is it every time the PC boots up?

Calamity:
IMPORTANT NOTE: As a rule, disable the splash screen, it causes the system to hang on boot on some systems (this may be the isse  mamenewb100 is reporting). Either edit grub.conf manually or use the new option in the video setup submenu / video grub.

@NightSprinter: In my experience, the exact same modeline that fits exactly for me in Windows, is slightly shifted to the left in Linux. I'm not sure why this happens, but it's definitely there. It's not a big problem because you can easily compensate for that, either with the monitor controls or by modifying the crt_specs line. When doing the second, try compensating both porches by the same amount when you change one of them, so if you decrease the horizontal front porch by 0.5 microseconds then increase the horizontal back porch by 0.5.

@mamenewb100: Very good news indeed, if your monitor accepts 120 Hz then it will look virtually the same as if it was 15 kHz natively, with the advantage of being able to use high resolutions when required. My Polostar won't accept 120 Hz. The jitter you notice is the only side effect but fortunately we have found a workaround that completely eliminates it, this was yesterday! Check this thread: http://forum.arcadecontrols.com/index.php/topic,130710.0.html
Hopefully next GM version will incorporate this new feature, so please be patient.

@lettuce: 31 kHz on boot, each time you boot. It only means a problem the first time because you need to find your way through a on screen menu right on boot. After that, it's the same story we've always had with normal cards and Windows, but here is better because you have 15 kHz just a few seconds after boot.
 

mamenewb100:
I know your getting harassed with allot of questions right now. I'm having issues with games running at wrong random refresh rates. Aren't most games supposed to go from 60.00Hz - > 120.00Hz? Some are 60.00 -> 112.00 and cause the games to run choppy.

I provided a text file and by all means, help people in order of who asked first.

Calamity:
Ok, the problem is with your current crt_specs0 line, you run out of horizontal frequency. You can either increase the higher limit (31800), or decrease the vertical front/back porches, which seem too big to me, they are actually wasting all your frequency with unnecessary blank lines:

SwitchRes: Monitor range 31800.00-31800.00,100.00-125.00,0.940,3.770,1.890,0.349,0.064,1.017,0,0,200,256,0,0
SwitchRes: Monitor range 31800.00-31800.00,49.50-65.00,0.940,3.770,1.890,0.349,0.064,1.017,0,0,384,480,0,0

   rng(0):  256 x 240_111.579p 31.912 [integ] scale(1, 1, 1) diff(0.00, 0.00, 51.5789) ratio(1.000, 1.000)


Try the default arcade_15 vertical values: 0.064, 0.192, 1.024

mamenewb100:
Figured I'd just need to mess with the numbers. The ones you suggested actually lowered the refresh more. But it means the settings are making a difference. I'll make one adjustment at a time and see if I can find the right ones. Thanks again.

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