david.henningsson at canonical.com
Wed Sep 29 10:14:49 CEST 2010
I'm researching a few bugs where the user claims position_fix=1 helps
the problem, but adding the quirk for that model surprisingly didn't. So
looking at the code, I concluded that the difference was
via_dmapos_patch, and that they all had via_dmapos_patch=1, and that
via_dmapos_patch=0 helped them solve the problem. Three out of five (not
all of them have reported back on via_dmapos_patch=0 yet) are VIA
controllers rev 10.
So we now have VIA controllers that need via_dmapos_patch=0.
I can think of a few approaches here:
1) since position_fix=1 implicitly sets via_dmapos_patch to 0 (maybe
unintentionally), we should add a position_fix=3 meaning lpib +
2) figure if something has changed recently (as in "within the last
year"...) that has made via_dmapos_patch=1 work worse than before
3) figure out if there are several ATI/VIA controllers that actually
never wants the patch.
David Henningsson, Canonical Ltd.
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