Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=1482220 Also, +1. On Sun, 2017-09-03 at 11:46 -0400, Ilia Mirkin wrote: > Commit df8dc97cd17 (drm/nouveau/kms/nv50: use drm core i2c-over-aux > algorithm) switched things over to the drm algo. Unfortunately it > generates address-only transactions. Prior to GF119, the hardware had > no support for such things, and GF119+ the nouveau code did not > handle > these properly. > > The result of this bug is that EDID doesn't make it over for DP (and > eDP) screens, which in turn wreaks all sorts of havoc. There have > been > lots of reports on IRC, a few on mailing lists, and also: > > https://bugs.freedesktop.org/show_bug.cgi?id=102528 > > Commit 13a86519202 (drm/nouveau/i2c/gf119-: add support for > address-only transactions) fixes the nouveau support for such > transactions on GF119+ and flips things back over to the custom algo > for earlier chips. Please include into the next v4.12.x release: > > commit 13a86519202c5d119d83640d6f781f3181205d2c > Author: Ben Skeggs <bskeggs@xxxxxxxxxx> > Date: Wed Jul 19 16:49:59 2017 +1000 > > drm/nouveau/i2c/gf119-: add support for address-only transactions > > Since switching the I2C-over-AUX helpers, there have been > regressions on > some display combinations due to us not having support for > "address only" > transactions. > > This commits enables support for them for GF119 and newer. > > Earlier GPUs have been reverted to a custom I2C-over-AUX > algorithm. > > Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx> > _______________________________________________ > Nouveau mailing list > Nouveau@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/nouveau