udev: tag any display devices as master-of-seat when nomodeset is used

System Internals / systemd - Zbigniew Jędrzejewski-Szmek [in.waw.pl] - 19 October 2019 18:52 EDT

Fixes #13773. See also https://bugzilla.redhat.com/show_bug.cgi?id=1728240, https://github.com/sddm/sddm/issues/1204.

When nomodeset is used on the kernel command line, there is no graphics device that the kernel knows, so we don't tag anything as master-of-seat, and seat0 has CanGraphical=no.

$ loginctl seat-status seat0 ; loginctl show-seat seat0 seat0 Devices: ├─/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 │ input:input0 "Power Button" ├─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb1 │ usb:usb1 │ └─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb1/1-1/1-1:1.0/0003:0627:0001.0001/input/input4 │ input:input4 "QEMU QEMU USB Tablet" ├─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb2 │ usb:usb2 ├─/sys/devices/pci0000:00/0000:00:1b.0/sound/card0 │ sound:card0 "Intel" ├─/sys/devices/platform/i8042/serio0/input/input1 │ input:input1 "AT Translated Set 2 keyboard" │ ├─/sys/devices/platform/i8042/serio0/input/input1/input1::capslock │ │ leds:input1::capslock │ ├─/sys/devices/platform/i8042/serio0/input/input1/input1::numlock │ │ leds:input1::numlock │ └─/sys/devices/platform/i8042/serio0/input/input1/input1::scrolllock │ leds:input1::scrolllock └─/sys/devices/platform/i8042/serio1/input/input3 input:input3 "ImExPS/2 Generic Explorer Mouse" Id=seat0 CanMultiSession=yes CanTTY=yes CanGraphical=no Sessions= IdleHint=yes IdleSinceHint=0 IdleSinceHintMonotonic=0

Let's tag the PCI device with "master-of-seat", so we get CanGraphical=yes, and "seat", so it is show as part of the seat:

[fedora@f31-bios ~]$ loginctl seat-status seat0 ; loginctl show-seat seat0 seat0 Devices: ├─/sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 │ input:input0 "Power Button" ├─/sys/devices/pci0000:00/0000:00:01.0 │ [MASTER] pci:0000:00:01.0 ├─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb1 │ usb:usb1 │ └─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb1/1-1/1-1:1.0/0003:0627:0001.0001/input/input4 │ input:input4 "QEMU QEMU USB Tablet" ├─/sys/devices/pci0000:00/0000:00:02.1/0000:02:00.0/usb2 │ usb:usb2 ├─/sys/devices/pci0000:00/0000:00:1b.0/sound/card0 │ sound:card0 "Intel" ├─/sys/devices/platform/i8042/serio0/input/input1 │ input:input1 "AT Translated Set 2 keyboard" │ ├─/sys/devices/platform/i8042/serio0/input/input1/input1::capslock │ │ leds:input1::capslock │ ├─/sys/devices/platform/i8042/serio0/input/input1/input1::numlock │ │ leds:input1::numlock │ └─/sys/devices/platform/i8042/serio0/input/input1/input1::scrolllock │ leds:input1::scrolllock └─/sys/devices/platform/i8042/serio1/input/input3 input:input3 "ImExPS/2 Generic Explorer Mouse" Id=seat0 CanMultiSession=yes CanTTY=yes CanGraphical=yes Sessions= IdleHint=yes IdleSinceHint=0 IdleSinceHintMonotonic=0

0325f71926 udev: tag any display devices as master-of-seat when nomodeset is used
src/login/71-seat.rules.in | 5 +++++
1 file changed, 5 insertions(+)

Upstream: github.com


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