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I'm running Arch on a recent Dell Inspiron 15 7000, with a hybrid Intel/Nvidia GPU setup and KDE. I've been trying for a few days to get a dual head setup. I'm running the latest proprietary nvidia drives (pacman-installed). On plugging in a HDMI cable connecting to an external monitor (the HDMI cable and monitor both function with the same laptop on a dual-booted Windows 10), this message pops up in journalctl -f:
lip 18 07:58:21 dell kdeinit5[818]: qml: OsdSelector loaded...
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: XRandR::setConfig
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Requested screen size is QSize(1920, 1080)
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Needed CRTCs: 1
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Actions to perform:
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Primary Output: false
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Change Screen Size: false
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Disable outputs: false
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Change outputs: false
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: Enable outputs: false
lip 18 07:58:23 dell kscreen_backend_launcher[960]: kscreen.xrandr: XRandR::setConfig done!
lip 18 07:58:23 dell kdeinit5[818]: kscreen: Requesting missing EDID for outputs (66)
lip 18 07:58:23 dell org_kde_powerdevil[953]: kscreen: Requesting missing EDID for outputs (66)Output of lspci -vv, because that might be helpful:
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05)
Subsystem: Dell Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers
Flags: bus master, fast devsel, latency 0
Capabilities: <access denied>
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 05) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 16
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000e000-0000efff [size=4K]
Memory behind bridge: dc000000-dd0fffff [size=17M]
Prefetchable memory behind bridge: 00000000b0000000-00000000c1ffffff [size=288M]
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0802
Flags: bus master, fast devsel, latency 0, IRQ 127
Memory at db000000 (64-bit, non-prefetchable) [size=16M]
Memory at 70000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 05)
Subsystem: Dell Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
Flags: fast devsel, IRQ 16
Memory at dd420000 (64-bit, non-prefetchable) [size=32K]
Capabilities: <access denied>
Kernel driver in use: proc_thermal
Kernel modules: processor_thermal_device
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31) (prog-if 30 [XHCI])
Subsystem: Dell Sunrise Point-H USB 3.0 xHCI Controller
Flags: bus master, medium devsel, latency 0, IRQ 135
Memory at dd410000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
Subsystem: Dell Sunrise Point-H Thermal subsystem
Flags: fast devsel, IRQ 18
Memory at dd438000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: intel_pch_thermal
Kernel modules: intel_pch_thermal
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31)
Subsystem: Dell Sunrise Point-H Serial IO I2C Controller
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at dd437000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #1 (rev 31)
Subsystem: Dell Sunrise Point-H Serial IO I2C Controller
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at dd436000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: intel-lpss
Kernel modules: intel_lpss_pci
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
Subsystem: Dell Sunrise Point-H CSME HECI
Flags: bus master, fast devsel, latency 0, IRQ 138
Memory at dd435000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: mei_me
Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] (rev 31) (prog-if 01 [AHCI 1.0])
Subsystem: Dell Sunrise Point-H SATA Controller [AHCI mode]
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 136
Memory at dd430000 (32-bit, non-prefetchable) [size=8K]
Memory at dd434000 (32-bit, non-prefetchable) [size=256]
I/O ports at f090 [size=8]
I/O ports at f080 [size=4]
I/O ports at f060 [size=32]
Memory at dd433000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: ahci
Kernel modules: ahci
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 122
Bus: primary=00, secondary=02, subordinate=3a, sec-latency=0
I/O behind bridge: 00002000-00002fff [size=4K]
Memory behind bridge: c4000000-da0fffff [size=353M]
Prefetchable memory behind bridge: 0000000080000000-00000000a1ffffff [size=544M]
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 123
Bus: primary=00, secondary=3b, subordinate=3b, sec-latency=0
I/O behind bridge: 0000d000-0000dfff [size=4K]
Memory behind bridge: dd300000-dd3fffff [size=1M]
Prefetchable memory behind bridge: None
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #6 (rev f1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 124
Bus: primary=00, secondary=3c, subordinate=3c, sec-latency=0
I/O behind bridge: None
Memory behind bridge: dd200000-dd2fffff [size=1M]
Prefetchable memory behind bridge: None
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 125
Bus: primary=00, secondary=3d, subordinate=3d, sec-latency=0
I/O behind bridge: None
Memory behind bridge: dd100000-dd1fffff [size=1M]
Prefetchable memory behind bridge: None
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
Subsystem: Dell Sunrise Point-H LPC Controller
Flags: bus master, fast devsel, latency 0
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
Subsystem: Dell Sunrise Point-H PMC
Flags: fast devsel
Memory at dd42c000 (32-bit, non-prefetchable) [disabled] [size=16K]
00:1f.3 Audio device: Intel Corporation CM238 HD Audio Controller (rev 31)
Subsystem: Dell CM238 HD Audio Controller
Flags: bus master, fast devsel, latency 32, IRQ 140
Memory at dd428000 (64-bit, non-prefetchable) [size=16K]
Memory at dd400000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
Subsystem: Dell Sunrise Point-H SMBus
Flags: medium devsel, IRQ 16
Memory at dd432000 (64-bit, non-prefetchable) [size=256]
I/O ports at f040 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
01:00.0 VGA compatible controller: NVIDIA Corporation GP106M [GeForce GTX 1060 Mobile] (rev ff) (prog-if ff)
!!! Unknown header type 7f
Kernel modules: nouveau, nvidia_drm, nvidia
01:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio Controller (rev ff) (prog-if ff)
!!! Unknown header type 7f
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
3b:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Flags: bus master, fast devsel, latency 0, IRQ 16
I/O ports at d000 [size=256]
Memory at dd304000 (64-bit, non-prefetchable) [size=4K]
Memory at dd300000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169
3c:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
Subsystem: Intel Corporation Wireless 8265 / 8275
Flags: bus master, fast devsel, latency 0, IRQ 139
Memory at dd200000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
3d:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 (prog-if 02 [NVM Express])
Subsystem: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961
Flags: bus master, fast devsel, latency 0, IRQ 16, NUMA node 0
Memory at dd100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: nvmeOffline
Are you running your X server on the Nvidia GPU or the Intel GPU ? If it's the former HDMI output should work out-of-the box, if it's the latter there is more work involved.
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