maintainer-feedback requested: [Bug 232499] x11-drivers/xf86-video-ati: "failed to add FB for modeset" "Failed to set mode on CRTC 0" "Failed to enable any CRTC"

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-x11 mailing list
<x11 at FreeBSD.org> for maintainer-feedback:
Bug 232499: x11-drivers/xf86-video-ati: "failed to add FB for modeset" "Failed
to set mode on CRTC 0" "Failed to enable any CRTC"
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232499



--- Description ---
When starting X, the screen goes blank (power save). The following messages
appear in Xorg.0.log:

[   107.089] failed to add FB for modeset
[   107.089] (WW) RADEON(0): Failed to set mode on CRTC 0
[   107.092] (EE) RADEON(0): Failed to enable any CRTC

xorg.conf and Xorg.0.log are attached.