Please help Ubuntu 9.10 / Acer Revo
#1
Question 
Hi there, I've done a lot of searching on this issue and found a lot of threads but because nettops are so new I am finding information very specific to hardware I go not have. I have an Acer Revo (dual-core, 2Gb) and I had hoped to use Ubuntu 9.10 on it but I am experiencing enough jitter in normal xvids to be distracting. I am using a 40" Sony Bravia TV through HDMI. Basically there is a line somewhere on the screen and you can tell the top and the bottom of the line are a frame off at times. So far I have done the following:

1) Ubuntu 9.10 fresh install / update
2) Activate NVIDIA proprietary driver through Hardware Drivers panel
3) Ran nvidia-config-settings
4) Configured compiz (works awesome on revo, btw)
5) Configured system sound through HDMI out
6) Installed sshfs, mounted network directories with video (video jitters with samba as well but I prefer sshfs)
7) Installed xbmc through synaptic pkg mgr
8) Activated VDPAU rendering with video synchronization

Since I'm sure many people will be coming here with revos would anyone be so kind as to offer comments on what they have done to eliminate the jitter that might apply to a Revo? While I have other problems in my Windows Vista partition, the video does not jitter there. Thanks.
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#2
I have that line also when i have compiz enabled, it disappears when i turn off all eyecandy in ubuntu Smile
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#3
Hey thanks! Hmm.. I guess it never occurred to me.. Compiz seems to be almost integrated in the OS now since Ubuntu 7 or so; it seems strange that it would still break stuff at this point. I'll try doing that to fix it.. Hopefully I can do it with some sort of wrapper script for xbmc.

Does anyone know if Compiz will be fixed ever? This is pretty much analogous to having to turn off the vista aero service to use windows media player which of course is unheard of.
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#4
I also had a bit of tearing/lines and I fixed it just by copy/pasting this xorg.conf from a dev. (disable of DynamicTwinView and "Scaling = Native" fixed it for me)

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"

# Fixes issue with modesetting on xbmc
Option "ExactModeTimingsDVI" "True" # we have proper modelines
Option "UseEDIDFreqs" "True" # trust no edid
# Option "ModeValidation" "NoEdidModes, NoMaxPClkCheck, NoEdidMaxPClkCheck, AllowNon60HzDFPModes" trust no edid
Option "FlatPanelProperties" "Scaling = Native" # make sure the gpu does not scale and loose performance

# Fixes tearing/smoothvideo issues
Option "DynamicTwinView" "False" # disable or you'll get tearing
Option "TripleBuffer" "0" # disable or xbmc will segfault with smoothvideo

# Misc
Option "NoLogo" "True" # we're not myspace

DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1920x1080@50" "1920x1080@60" "1920x1080@24" "[email protected]" "[email protected]" "1920x1080@25" "[email protected]" "1920x1080@30"
EndSubSection
EndSection

Section "Monitor"
Identifier "Monitor0"

HorizSync 20.0 - 150.0
VertRefresh 22.0 - 90.0

# 1920x1080p @ 50Hz (EIA/CEA-861B)
ModeLine "1920x1080@50" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 60Hz (EIA/CEA-861B)
ModeLine "1920x1080@60" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 24Hz (EIA/CEA-861B)
ModeLine "1920x1080@24" 74.250 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 23.976Hz (EIA/CEA-861B)
ModeLine "[email protected]" 74.175 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 59.94Hz (EIA/CEA-861B)
ModeLine "[email protected]" 148.350 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 25Hz (EIA/CEA-861B)
ModeLine "1920x1080@25" 74.250 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 29.97Hz (EIA/CEA-861B)
ModeLine "[email protected]" 74.175 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
# 1920x1080p @ 30Hz (EIA/CEA-861B)
ModeLine "1920x1080@30" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
EndSection

Section "Extensions"
# fixes tearing with vdpau/vsync
Option "Composite" "Disable"
EndSection
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#5
I had the same issue and solved it by setting the refresh rate in the nvidia control panel to 60hz instead of 50hz.
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#6
I've been having this problem in 9.10 with XBMC on Acer Aspire Revo 3600, had been assuming it was an Nvidia or an XBMC setting, however the only thing that seemed to resolve it (after reading the other responses) was selecting "None" from Preferences > Appearance > Visual Effects.

I'm too new at Linux / Ubuntu to understand why this might be, but it has worked for me! HTPC happiness (for now...)

:-)
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Please help Ubuntu 9.10 / Acer Revo0