There's not enough info provided to troubleshoot this issue.
My guess though is that you might have some -fglrx bits installed still
- see
https://wiki.ubuntu.com/X/Troubleshooting/FglrxInteferesWithRadeonDriver
If that doesn't fix it, then you should provide more information,
including your xorg.conf, output of lspci -vvnn, and your Xorg.0.log
after reproducing the issue.
** Summary changed:
- very choppy video with ATI Mobility Radeon HD 3650 and
xserver-xorg-video-radeon or xserver-xorg-video-radeonhd
+ [HD 3650] very choppy video -radeon or -radeonhd
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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[HD 3650] very choppy video -radeon or -radeonhd
https://bugs.launchpad.net/bugs/326697
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