<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [DP] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues" href="https://bugs.freedesktop.org/show_bug.cgi?id=97244#c59">Comment # 59</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [DP] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues" href="https://bugs.freedesktop.org/show_bug.cgi?id=97244">bug 97244</a> from <a class="email" href="mailto:ankit.k.nautiyal@intel.com" title="Ankit <ankit.k.nautiyal@intel.com>"> Ankit</a> <pre>Comment on <a href="attachment.cgi?id=145267" name="attach_145267" title="Logs with 5K HPz27q">attachment 145267</a> <a href="attachment.cgi?id=145267&action=edit" title="Logs with 5K HPz27q">[details]</a> Logs with 5K HPz27q I was able to get 5K HPz27q 317b monitor for some time. Below are the observation on HPz27q Monitor with two DP cables connected to a KBL machine. *****General Observation***** The monitor settings has two modes, DP1.0 and DP1.2. One of the connector is enumerated as 'tiled' and the other as non tiled. The non-tiled connector has modes starting from 2K and below, and the tiled connector has just one mode 2560x2880. No corruption observed in this case. In case of DP2.0 two connectors are enumerated, both tiled. One connector has modes from 3849x2160 and below. 2560x2880 being preferred mode. The other has 2560x2880 mode, also preferred. The issue is seen when both the modes selected are 2560x2880. This results like two halves of screens not in sync. *****Experiment with different patches***** I collected logs in 3 cases: 1. Without any patch (vanilla) 2. With patch to prune the 2560x2880 mode, only for tile with HLOC and VLOC as 0. 3. With a patch to force the connector property as 'false' Logs for which are attached. Note 1: I had changed the display info to provide the Tile information, in case the connector 'has_tile' is true. Note 2: I had checked and collected logs with single display and also with dual display configuration with DP1.2 monitor settings. Note 3: The mode is changed using xrandr. case1: -Without any patch : 2560x2880 modeset on both connectors causes corruption. case2: -With 2560x2880 mode pruned for one of the tile : Only one of the connector shows 2560x2880 mode. 2560x2880 modeset on any the remaining connector resulted in blank screen. Any other modeset works. case3: -With has_tile connector property forcibly reset : The connector listed as not tiled but still, 2560x2880 modeset on any the connectors causes blank screen. Any other modeset works. To summarize, pruning on just one tiled connector does not solve the issue, if we need to prune, we need to do it for both the connectors. Secondly, the forcible setting of has_tile = 'false' also, does not help, and resulted in blank screen when 2560x2880 mode is applied. So IMHO if we need to prune the mode 2560x2880, we need to prune it for both the connectors.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>