Comment 89 for bug 256142
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#89 |
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0e1f616
(Get the code!)
To answer the questions:
- Jitter only happens with FBC.
- It happens only on the VGA display. (But that is because the LVDS is always on plane B, due to my DRM being the one from kernel 2.6.25 and not from git master.)
I have tried the patch. It did not fix the issue at all (though it may have reduced how often it occurs). Nevertheless, you seem to be on the right track: Whenever a flicker occurs, an "underrun on pipe A" line appears in my log.
I will now play with the DSPARB register. When you said 48, did you mean that the register should be set to 0x2FB0? (Just to be sure I understand the documentation correctly.) Should I care about display C / overlay?