<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Reproducible black screen glitches on DVI monitor with specific image using passive DP-DVI adaptor" href="https://bugs.freedesktop.org/show_bug.cgi?id=89110#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Reproducible black screen glitches on DVI monitor with specific image using passive DP-DVI adaptor" href="https://bugs.freedesktop.org/show_bug.cgi?id=89110">bug 89110</a> from <a class="email" href="mailto:chris.bainbridge@gmail.com" title="Chris Bainbridge <chris.bainbridge@gmail.com>"> Chris Bainbridge</a> <pre>This is the adaptor: <a href="http://www.ebay.co.uk/itm/Mini-Display-Port-to-DVI-I-Monitor-Adaptor-Converter-Cable-DisplayPort-24-5-/271098976593">http://www.ebay.co.uk/itm/Mini-Display-Port-to-DVI-I-Monitor-Adaptor-Converter-Cable-DisplayPort-24-5-/271098976593</a> The description says: Support Mini DisplayPort 1.1a compliant receiver offering 5.4Gbps bandwidth over 2 lanes. • Support video resolution 1080p, Supports 1920 x 1200 reduced blanking video resolution. • Powered from MiniDisplay source. • Compatibility: iMac, Mac Mini, Mac Pro, MacBook Air, MacBook Pro 13 inch, MacBook Pro 15 inch, MacBook Pro 17 inch. • Connectors: Mini Display Port Male to DVI-I Female 15cm. (Length includes connectors) Since it supports reduced blanking, I tried creating a reduced blanking mode: $ cvt -r 1680 1050 # 1680x1050 59.88 Hz (CVT 1.76MA-R) hsync: 64.67 kHz; pclk: 119.00 MHz Modeline "1680x1050R" 119.00 1680 1728 1760 1840 1050 1053 1059 1080 +hsync -vsync $ xrandr --newmode 1680x1050R 119.00 1680 1728 1760 1840 1050 1053 1059 1080 +hsync -vsync $ xrandr --addmode HDMI3 1680x1050R $ xrandr --output HDMI3 --mode 1680x1050R The new mode works without any glitching. If I do the previous test, and while the screen is glitching do "xrandr --output HDMI3 --mode 1680x1050R", the screen will immediately stop glitching. So perhaps OS X is using a reduced blanking mode, or some other altered timings, and that is why the glitching does not appear there.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>