I have three monitors - one via HDMI from an Asus Z370-P motherboard (Intel UHD Graphics 630 driver: i915) and two via DVI from a Radeon HD 4650 (AMD RV730 PRO [Radeon HD 4650] driver: radeon).
On boot, the HDMI shows the login screen, the other two are “CL grey”.
On login, the HDMI monitor dies and the other two run the X session as you would expect.
lshw shows the kernel sees the i915 (I think that’s true?):
# lshw -c video
*-display
description: Display controller
product: UHD Graphics 630 (Desktop)
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm bus_master cap_list
configuration: driver=i915 latency=0
resources: irq:127 memory:f6000000-f6ffffff memory:d0000000-dfffffff ioport:f000(size=64)
*-display
description: VGA compatible controller
product: RV730 PRO [Radeon HD 4650]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:139 memory:e0000000-efffffff memory:f7220000-f722ffff ioport:e000(size=256) memory:c0000-dffff
but xrandr does not see it…
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
DVI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 478mm x 269mm
1920x1080 60.00*+
...
DIN disconnected (normal left inverted right x axis y axis)
DVI-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00*+
...
What must I do to have CL recognise the i915 HDMI monitor, please?
Many thanks,
Jerry