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

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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
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2019-10-17 12:37:12 +02:00
parent d2fc7d22cb
commit 0325f71926
1 changed files with 5 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/login/71-seat.rules.in
View file

@ -24,6 +24,11 @@ SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", DRIVERS=="hyperv_fb", TAG+="master-of-
# Allow efifb / uvesafb to be a master if KMS is disabled
SUBSYSTEM=="graphics", KERNEL=="fb[0-9]", IMPORT{cmdline}="nomodeset", TAG+="master-of-seat"
# Allow any PCI graphics device to be a master and synthesize a seat if KMS
# is disabled and the kernel doesn't have a driver that would work with this device.
SUBSYSTEM=="pci", ENV{ID_PCI_CLASS_FROM_DATABASE}=="Display controller", \
ENV{DRIVER}=="", IMPORT{cmdline}="nomodeset", TAG+="seat", TAG+="master-of-seat"
SUBSYSTEM=="drm", KERNEL=="card[0-9]*", TAG+="seat", TAG+="master-of-seat"
SUBSYSTEM=="usb", ATTR{bDeviceClass}=="09", TAG+="seat"