On Tue, Jan 06, 2015 at 10:07:58PM -0800, Keith Packard wrote: > * PGP Signed by an unknown key > > Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes: > > > it looks like the beginning is the same, but then it just turns to all > > ones at a random point (even *within* a byte). > > Looks like the EDID ROM is dropping off the i2c bus in the middle of the > transfer. Wonder if it's being 'clever' if things go too slowly at some > point, or if there's a bug in the DDC code that's in use. FWIW, I've seen that exact symptom on some monitors when the +5V pin on the DVI or HDMI cable from the GPU isn't enabled (or isn't providing enough current). Some monitors power the i2c/edid/DDC logic from that +5V either exclusively or when in the DPMS off state, and the i2c chip will just stop responding after a few cycles if not provided sufficient power. - Robert _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
