02047: -syncrefresh does not affect speed throttling

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
02047	Interface	Minor	Always	Jul 26, 2008, 00:34	Jul 26, 2008, 17:24

Tester	Mr_Person	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver
Version	0.126u2	Fixed in Version		Build	I686
		Fixed in Git Commit		Github Pull Request #

Summary	02047: -syncrefresh does not affect speed throttling
Description	I was playing around with different refresh rates on my old CRT today and I noticed that -syncrefresh wasn't actually syncing to my monitor's refresh like it's supposed to. There was no tearing, but the speed was never altered, as if it was running with just -waitvsync. Even with rates way too high to be using -syncrefresh with (85Hz+), everything ran at its proper speed. I experimented a bit and found that it's actually been broken for quite some time; it last worked properly in 0.113, just before the throttling and frameskipping moved to the core. Example: MAME 0.113, 60Hz LCD, -syncrefresh enabled, running ddonpach (57.55 Hz) - Perfectly synced video. 104% speed. Same options on 0.126u2 - Runs at 100% speed.
Steps To Reproduce	Start any game with a refresh rate lower than your monitor's with -syncrefresh enabled.
Additional Information
Github Commit

Flags
Regression Version	0.113u1
Affected Sets / Systems

Attached Files

No.01808 etabeta Developer Jul 26, 2008, 09:40 edited on: Jul 26, 2008, 09:44	can you check if you have -mt 1 in your mame.ini? it sounds a lot like 01687
No.01809 Mr_Person Tester Jul 26, 2008, 10:02	Negative, using a separate MAME install for testing with no INIs sitting around. Getting the same behavior on other computers too, including my old single core laptop.
No.01810 Tafoid Administrator Jul 26, 2008, 14:21	Hmm.. try shutting of the throttle. My understanding is if you are using the -syncrefresh to govern the speed, -nothrottle must be used to shut of the automatic 100% limiting. I try it on my end on 0.126u2 and I get a 104-105% from MAME on ddonpach. Without -nothrottle, I get 100%. d:\emulator\arcade\mame>mame ddonpach -syncrefresh -str 20 Average speed: 100.00% (19 seconds) d:\emulator\arcade\mame>mame ddonpach -syncrefresh -nothrottle -str 20 Average speed: 104.41% (19 seconds)
No.01811 Mr_Person Tester Jul 26, 2008, 14:39 edited on: Jul 26, 2008, 14:40	Yes, but using the other syncing options produce the same result. C:\home\emulation\mame>mamepp -triplebuffer -nothrottle -str 20 ddonpach Average speed: 104.06% (19 seconds) -syncrefresh used to change the speed the game would be throttled to with the throttle enabled. Is this switch just not useful with the way throttling works now, or am I misunderstanding what it's for?
No.01813 Tafoid Administrator Jul 26, 2008, 17:24	The throttle will assume 100% regardless of the syncing command (-triplebuffer acts the same throttled (at 100%) and unthrottled (104%+) as -syncrefresh did. I'm not sure, though, if this was expected to change. Aaron would have a better grasp on what is expected behavior now compared to the old video timing routines in 0.113. I'll set acknowledged and allow for more commenting.