Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Ville Syrjälä
On Fri, May 05, 2017 at 03:53:39AM -0400, Sanford Rockowitz wrote: > I am the author of ddcutil (www.ddcutil.com), a Linux utility that > manages monitor settings using DDC/CI. I am seeing a pattern of user > error reports in which I2C communication is not working when a system > with a recent

Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Jani Nikula
On Fri, 05 May 2017, Sanford Rockowitz wrote: > Last question (I think). You wrote: > >> You'll want the DP MST I2C code fixed. Well, at least it's my *guess* > that's where the problem is. > > Where do I go to post this problem? Sorry, I could have added that in my

Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Sanford Rockowitz
Last question (I think). You wrote: > You'll want the DP MST I2C code fixed. Well, at least it's my *guess* that's where the problem is. Where do I go to post this problem? Thanks, Sanford On 05/05/2017 12:49 PM, Jani Nikula wrote: > On Fri, 05 May 2017, Sanford Rockowitz

Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Jani Nikula
On Fri, 05 May 2017, Sanford Rockowitz wrote: > Jani, > > Thanks for your quick and detailed response. > > You wrote: > >> The single DP link is divided to several logical links to sink devices. > > Suppose the dock has a DVI and/or HDMI connector. Are those connectors >

Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Sanford Rockowitz
Jani, Thanks for your quick and detailed response. You wrote: > The single DP link is divided to several logical links to sink devices. Suppose the dock has a DVI and/or HDMI connector. Are those connectors logical sinks to a master DisplayPort connection, or do they have their own

Re: [Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Jani Nikula
On Fri, 05 May 2017, Sanford Rockowitz wrote: > I am the author of ddcutil (www.ddcutil.com), a Linux utility that > manages monitor settings using DDC/CI. I am seeing a pattern of user > error reports in which I2C communication is not working when a system > with a recent

[Intel-gfx] i915 I2C failures with recent chips and docking stations

2017-05-05 Thread Sanford Rockowitz
I am the author of ddcutil (www.ddcutil.com), a Linux utility that manages monitor settings using DDC/CI. I am seeing a pattern of user error reports in which I2C communication is not working when a system with a recent Intel chip, using the i915 driver, is plugged into a docking station.