Robert Morell <rmorell at nvidia.com> writes: > 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.
Makes sense -- the chip will power itself from the i2c when not transmitting, and can talk until whatever energy is stored in various capacitors on the Vcc rail discharge. -- -keith -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 810 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20150106/bb2caccd/attachment.sig>
