<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - regression bisected black screen with cursor" href="https://bugs.freedesktop.org/show_bug.cgi?id=110030#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - regression bisected black screen with cursor" href="https://bugs.freedesktop.org/show_bug.cgi?id=110030">bug 110030</a> from <a class="email" href="mailto:2kmm@gmx.de" title="Manuel Mommertz <2kmm@gmx.de>"> Manuel Mommertz</a> <pre>Created <a href="attachment.cgi?id=143674" name="attach_143674" title="test-patch">attachment 143674</a> <a href="attachment.cgi?id=143674&action=edit" title="test-patch">[details]</a> <a href='page.cgi?id=splinter.html&bug=110030&attachment=143674'>[review]</a> test-patch I try to understand what exactly changed here so I looked into the sources. I have found that the association between connectors and crtcs changes due to the patch mentioned above. With the attached test-patch X works again and the debugging output shows the exchange of crtc-pointers between the connectors: [ 2.878198] [drm:drm_setup_crtcs [drm_kms_helper]] NOT WORKING: CONN 4 - crtc: ffffa36ef4054f48 [ 2.878201] [drm:drm_setup_crtcs [drm_kms_helper]] NOT WORKING: CONN 5 - crtc: ffffa36ef4054f00 [ 2.878205] [drm:drm_setup_crtcs [drm_kms_helper]] WORKING: CONN 4 - crtc: ffffa36ef4054f00 [ 2.878207] [drm:drm_setup_crtcs [drm_kms_helper]] WORKING: CONN 5 - crtc: ffffa36ef4054f48 In the duplicate bug you said: > Not a bug in the kernel, xorg's modesetting driver needs to set all > connectors/crtc's directly when using atomic. The legacy path disabled crtc > B for you if you stole all its connectors for a different crtc. In the > atomic case you need to disable it yourself. > > This is a bug in x.org's modesetting driver. Though it seems to me this is not related here as there are no stolen connectors involved. And the source of the modesetting-driver from xorg already has a part that disables crtcs without connection (see <a href="https://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/drivers/modesetting/drmmode_display.c">https://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/drivers/modesetting/drmmode_display.c</a> line 778) So do you say the right path from here is to let the modesetting driver change the association between the connectors and crtcs?</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>