Bug 89919

Summary: VDPAU Playback Slow with CRTC @ 24 hz
Product: xorg Reporter: Adam Leggett <adamvleggett>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED INVALID QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: vliaskovitis
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Xorg log
none
dmesg output none

Description Adam Leggett 2015-04-06 14:43:45 UTC 
My GPU is Mullins, integrated with the GX-412HC system-on-chip.

I am running Ubuntu 14.10 with xserver-xorg-video-radeon_7.5.0-1.

Video playback through a competent player like mpv is generally smooth even when using the default performance profile, with the default 60hz display mode selected. However, if I use xrandr:

xrandr --output HDMI-0 --mode 1920x1080 --rate 24

Suddenly playback becomes quite jerky, and is not helped much by raising the card to the highest performance profile. This is true of VLC, mpv, and mplayer2, so I do not think it is player related. This is also true of any video file.

I have tested this with a variety of radeon DRI and xserver-xorg-video-radeon versions. In those versions that support Mullins, I have not seen any differences.

Using a 24hz mode is very desirable when playing back a feature film that was shot at 24 fps.
Comment 1 Alex Deucher 2015-04-06 18:01:27 UTC 
Please attach your xorg log and dmesg output.
Comment 2 Adam Leggett 2015-04-06 18:50:25 UTC 
Created attachment 114887 [details]
Xorg log

Yes, I am using display :2.
Comment 3 Adam Leggett 2015-04-06 19:00:01 UTC 
Created attachment 114888 [details]
dmesg output
Comment 4 Adam Leggett 2015-04-07 01:32:03 UTC 
Additional info: OpenGL is also slowed down significantly. The problem is not limited to VDPAU.
Comment 5 Christopher M. Penalver 2016-02-25 07:41:46 UTC 
Adam Leggett, Ubuntu 14.10 is EOL as of July 23, 2015. For more on this, please see https://wiki.ubuntu.com/Releases .

If this is reproducible in a supported release, it will help immensely if you filed a new report with Ubuntu by ensuring you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information running the following from a terminal:
ubuntu-bug xorg

Also, please feel free to subscribe me to it.

For more on why this is helpful, please see https://wiki.ubuntu.com/ReportingBugs.

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