[Bug 110030] regression bisected black screen with cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110030

--- Comment #7 from Thomas Pfaff <tpfaff at gmx.net> ---
I have the same problem, but this time it is not related to a dual monitor
configuration.

On my Pentium N3710 based notebook the X server does not start anymore too.
I made some investigations, and i guess its because after the patch another
crtcs is choosen for the desired mode.

Before the patch intel_fb_initial_config always returned false, and
drm_setup_crtcs is choosing crtc 46:pipe A which is fine for the X server.
[drm:intel_fb_initial_config [i915]] Not using firmware configuration
[drm:drm_setup_crtcs [drm_kms_helper]] looking for cmdline mode on connector 91
[drm:drm_setup_crtcs [drm_kms_helper]] looking for preferred mode on connector
91 0
[drm:drm_setup_crtcs [drm_kms_helper]] found mode 1366x768
[drm:drm_setup_crtcs [drm_kms_helper]] picking CRTCs for 8192x8192 config
[drm:drm_setup_crtcs [drm_kms_helper]] desired mode 1366x768 set on crtc 46
(0,0)

Now intel_fb_initial_config is returning true, but is choosing crtc 63 instead,
and with crtc 63 the X server doesn't come up
[drm:intel_fb_initial_config [i915]] looking for cmdline mode on connector
eDP-1
[drm:intel_fb_initial_config [i915]] looking for preferred mode on connector
eDP-1 0
[drm:intel_fb_initial_config [i915]] connector eDP-1 on [CRTC:63:pipe B]:
1366x768
[drm:intel_fb_initial_config [i915]] connector DP-1 not enabled, skipping
[drm:intel_fb_initial_config [i915]] connector HDMI-A-1 not enabled, skipping
[drm:intel_fb_initial_config [i915]] connector DP-2 not enabled, skipping
[drm:intel_fb_initial_config [i915]] connector HDMI-A-2 not enabled, skipping
[drm:drm_setup_crtcs [drm_kms_helper]] desired mode 1366x768 set on crtc 63
(0,0)

So probably the patch itself is correct, but it breaks a previously running
system, and i do not see any progress in the X server about an atomic commit.
There was some initial work according to
https://gitlab.freedesktop.org/xorg/xserver/merge_requests/36/commits
but the patches are pending for almost half year.

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