<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - No signal to monitor with X and openchrome using VX855 chipset graphics" href="https://bugs.freedesktop.org/show_bug.cgi?id=91966#c202">Comment # 202</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - No signal to monitor with X and openchrome using VX855 chipset graphics" href="https://bugs.freedesktop.org/show_bug.cgi?id=91966">bug 91966</a> from <a class="email" href="mailto:kevinbrace@gmx.com" title="Kevin Brace <kevinbrace@gmx.com>"> Kevin Brace</a> <pre>(In reply to HuangRan from <a href="show_bug.cgi?id=91966#c201">comment #201</a>) Hi Frank, > Hi Guys, > > Returning from my holiday and looking at this thread from the start to > the end takes me several hours to do so although I have to skip some content > for your chat becuase it is so long. > As I replied the mail to Kevin, I prefer to put my more time on > OpenChrome and has several guys invovled on this project. So I hope I can > provide some useful informaiton on this bug too. > So is this bug fixed or not? Does I2C 2 probe EDID information from DVI > interface? > > Thanks, > Frank The way the code works right now with the patch is that I2C bus 1 and 2 are used for VGA related monitor detection. xserver's API returns a structure that tells the caller if the monitor type is analog or digital. I use this information to see if I2C bus 1 or 2 is connected to an analog monitor (i.e., VGA monitor). I read the Intel DDX UMS code, and they apparently do this. As for DVI, I2C bus 2 or 3 are used for communicating with the monitor and an external TMDS transmitter chip. In other words, I2C bus 2 can be used for VGA, DVI, or even a TV encoder chip. The code that handles an external TMDS transmitter for DVI (i.e., VT1632A chip) is still relatively unproven. It was donated in early 2015, but there was a bug in it, and I help fix it with the person who reported it (<a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - Segfault in xf86DestroyI2CDevRec" href="show_bug.cgi?id=93675">Bug 93675</a>). I do own about 10 or so VIA Technologies IGP based mainboards / computers at my place, but I do not really have a functional mainboard / computer with DVI coming out of it at this point that is not a thin client.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>