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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.
This commit is contained in:
Adam Jackson 2019-03-12 20:22:13 +01:00 committed by Lennart Poettering
parent 3f50fff536
commit 183e8c0bea
1 changed files with 3 additions and 0 deletions
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3
src/login/71-seat.rules.in
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@ -17,6 +17,9 @@ SUBSYSTEM=="graphics", KERNEL=="fb[0-9]*", TAG+="seat"
# HyperV currently doesn't do DRM, hence we need to synthesize for HyperV's fb device instead
SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", DRIVERS=="hyperv_fb", TAG+="master-of-seat"
# Allow efifb / uvesafb to be a master if KMS is disabled
SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", IMPORT{cmdline}="nomodeset", TAG+="master-of-seat"
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", TAG+="seat", TAG+="master-of-seat"
SUBSYSTEM=="usb", ATTR{bDeviceClass}=="09", TAG+="seat"