Linux HOW-TO achieve perfect playback at 23.97 or 59.94 Hz with NVIDIA GPU hardware

I can not believe I only just found this topic :\ I've been running windows for now, since I couldn't get linux to use the right modes and none of the guides I found worked to solve my EDID problem. This looks like the exact solution to my problem!
Can't wait to try it out, thanks!

Tried it, but doesn't work. Once I use the xorg file, my gnome is severly limited. I can only see the desktop and no shortcuts (like alt-F2) work. I can succesfully use shortcuts on the desktop. XBMC however, still doesn't change the refresh rate.
If I remove the xorg completely, everything is fine again. Interestingly enough, in addition I can now suddenly successfully switch to 24p mode using the nvidia-settings. The TV reports that it is in the correct mode. XBMC still won't work though, I assume because it uses xrandr?

Anyone any ideas?

kingmob Wrote:Tried it, but doesn't work. Once I use the xorg file, my gnome is severly limited. I can only see the desktop and no shortcuts (like alt-F2) work. I can succesfully use shortcuts on the desktop. XBMC however, still doesn't change the refresh rate.
If I remove the xorg completely, everything is fine again. Interestingly enough, in addition I can now suddenly successfully switch to 24p mode using the nvidia-settings. The TV reports that it is in the correct mode. XBMC still won't work though, I assume because it uses xrandr?

Anyone any ideas?

When you run this script, it disables graphics modes that are required for the Unity interface to work. This is why your desktop is limited. You need to log off, and on the Ubuntu login screen, change to Ubuntu Classic. I did it a couple months ago, so I cant remember off the top of my head how to change it, but you can search how to "disable Unity" and it will bring back your desktop toolbars and menus.

As for why your refresh rate doesn't actually change, I have no idea. I gather that it just works for some people and not for others. Thankfully for me, it fixes my refresh rate problem, but not the occasional video skipped frames. This is something I have been dealing with for months, and it bothers me, but not enough for me to stop using it.

constrictor Wrote:When you run this script, it disables graphics modes that are required for the Unity interface to work. This is why your desktop is limited. You need to log off, and on the Ubuntu login screen, change to Ubuntu Classic. I did it a couple months ago, so I cant remember off the top of my head how to change it, but you can search how to "disable Unity" and it will bring back your desktop toolbars and menus.

As for why your refresh rate doesn't actually change, I have no idea. I gather that it just works for some people and not for others. Thankfully for me, it fixes my refresh rate problem, but not the occasional video skipped frames. This is something I have been dealing with for months, and it bothers me, but not enough for me to stop using it.

Thanks for your reply. I think I know how to change it, so no probs, I just didn't realise anything was disabled (did not use the script, I'm too paranoid ).

As to why it still won't work, anyone know how XBMC handles the detection of refresh rate and changing of the mode? To me it appears that nvidia-settings has the corrcet setting and can succesfully change everything (at least now it can). Xrandr is another story however. It reports bogus modes as far as I can see and even reports that 60Hz is out of range.

soopersonic Wrote:Is there some way I can find out what is actually being output by XBMC / played back on my TV? I mean whether it's 24Hz or 23.976Hz?

nvidia-settings -q "refreshrate"

gives you the actual refresh rate that your card puts out to the tv.
you might need to export DISPLAY= ..... before you can use this command e.g. via ssh while xbmc is on full screen playback.

boba

boba23 Wrote:nvidia-settings -q "refreshrate"

gives you the actual refresh rate that your card puts out to the tv.
you might need to export DISPLAY= ..... before you can use this command e.g. via ssh while xbmc is on full screen playback.

boba

Thanks for your reply!

And what does it mean if the output of above's command is 23.976 for my TV which supposedly supports 24p with 48Hz?

48 hertz is probably because the tv can do motion interpolation, so the refreshrate is still 23.976 hertz, and the tv turns that into 47.952 hertz.

bobo1on1 Wrote:48 hertz is probably because the tv can do motion interpolation, so the refreshrate is still 23.976 hertz, and the tv turns that into 47.952 hertz.

Got it, thanks!

Created the .sh script and works perfectly however I am still getting the jitter in my playback of 1080p video on the as rock ION330 for some reason.

Running the latest NVidia drivers 280.13. Hope this isn't the issue? Is it possible to go back a version?

Update:

I finally enabled Dirty Regions in the advancedsettings.xml on a Pre-Eden build and after a quick 20 minute viewing of a Blu-Ray rip, I noticed no hiccups. I will sustain my enthusiasm until I have a chance to watch a whole movie, but I am optimistically hopeful that this will finally solve my video stuttering problem!