login: mark nomodeset fb devices as master-of-seat
When 'nomodeset' is specified, there's no DRM driver to take over from efifb. This means no device will be marked as a seat master, so gdm will never find a sufficiently active seat to start on. I'm not aware of an especially good way to detect this through a proper kernel API, so check for the word 'nomodeset' on the command line and allow fbdev devices to be seat masters if found. For https://bugzilla.redhat.com/show_bug.cgi?id=1683197.
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@ -17,6 +17,9 @@ SUBSYSTEM=="graphics", KERNEL=="fb[0-9]*", TAG+="seat"
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# HyperV currently doesn't do DRM, hence we need to synthesize for HyperV's fb device instead
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SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", DRIVERS=="hyperv_fb", TAG+="master-of-seat"
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# Allow efifb / uvesafb to be a master if KMS is disabled
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SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", IMPORT{cmdline}="nomodeset", TAG+="master-of-seat"
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SUBSYSTEM=="drm", KERNEL=="card[0-9]*", TAG+="seat", TAG+="master-of-seat"
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SUBSYSTEM=="usb", ATTR{bDeviceClass}=="09", TAG+="seat"
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