The CM is freshly synced with current 10.1 branch, I think this is the result of reverting some gfx changes; I will try a source adjustment accordingly!
This issue isn't present on RazM or AtrHD so I'm not totally sure what's happening here
I've never bothered to push the tearing fix to the old CM10.1 branch.
Besides Photon Q, I've seen a lot of complaints about tearing also from Atrix HD and Razr M users of CM10.1 and 10.2, until I've finally figured it out and pushed the fix to the CM10.2 branch. Since then the complains ceased.
Photon Q, Atrix HD and Razr M use the command mode display panel so they were all affected the same way.
Razr HD devices use the video mode panel, so they were not affected by tearing.
EDIT: for your convenience, I've pushed it to the cm-10.1 branch now.
(I didn't realize before that the old branch is still being used, otherwise I'd have done it sooner.)
http://review.cyanogenmod.org/60031
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