Video.allow_duplicates=1 where to enter

Support Graphics & Display
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[Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter “video.allow_duplicates=1” if the current driver doesn’t work

where to enter: video.allow_duplicates=1

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What driver? What problems are you having?

See: Kernel parameters - ArchWiki

Your topic title is an incomplete statement and is not a question. Please edit it.

Please see:

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many Infos

sudo dmesg --level=err,warn                                                                                 1 ✘ 
[sudo] Passwort für weingeist: 
[    0.147167] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
[    0.150822] ipmi:dmi: Base address is zero, assuming no IPMI interface
[    0.268170] pci 0000:07:00.0: [Firmware Bug]: disabling VPD access (can't determine size of non-standard VPD format)
[    0.867662] ata1.00: supports DRM functions and may not be fully accessible
[    0.874636] ata1.00: supports DRM functions and may not be fully accessible
[    1.530868] usb 2-1.7: config 1 interface 0 altsetting 0 has 2 endpoint descriptors, different from the interface descriptor's value: 1
[    2.787090] sdhci-pci 0000:13:00.1: Will use DMA mode even though HW doesn't fully claim to support it.
[    2.787174] sdhci-pci 0000:13:00.1: Will use DMA mode even though HW doesn't fully claim to support it.
[    2.787310] sdhci-pci 0000:13:00.1: Will use DMA mode even though HW doesn't fully claim to support it.
[    4.092723] ipmi_si: Unable to find any System Interface(s)
[    4.528953] wmi_bus wmi_bus-PNP0C14:00: WQBC data block query control method not found
[    4.543177] ACPI Warning: SystemIO range 0x0000000000000428-0x000000000000042F conflicts with OpRegion 0x0000000000000400-0x000000000000047F (\PMIO) (20210730/utaddress-204)
[    4.543193] ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054F conflicts with OpRegion 0x0000000000000500-0x000000000000055F (\_SB.PCI0.PEG0.PEGP.GPIO) (20210730/utaddress-204)
[    4.543198] ACPI Warning: SystemIO range 0x0000000000000540-0x000000000000054F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20210730/utaddress-204)
[    4.543206] ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x000000000000055F (\_SB.PCI0.PEG0.PEGP.GPIO) (20210730/utaddress-204)
[    4.543212] ACPI Warning: SystemIO range 0x0000000000000530-0x000000000000053F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20210730/utaddress-204)
[    4.543219] ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x000000000000055F (\_SB.PCI0.PEG0.PEGP.GPIO) (20210730/utaddress-204)
[    4.543224] ACPI Warning: SystemIO range 0x0000000000000500-0x000000000000052F conflicts with OpRegion 0x0000000000000500-0x0000000000000563 (\GPIO) (20210730/utaddress-204)
[    4.543231] lpc_ich: Resource conflict(s) found affecting gpio_ich
[    4.878782] ATPX version 1, functions 0x000000bf
[    4.924463] at24 9-0050: supply vcc not found, using dummy regulator
[    4.925103] at24 9-0052: supply vcc not found, using dummy regulator
[    5.160021] kauditd_printk_skb: 33 callbacks suppressed
[   10.310937] kauditd_printk_skb: 5 callbacks suppressed
[   16.631698] kauditd_printk_skb: 11 callbacks suppressed

lspci -nnk | grep -A3 VGA                                                                                                                                              PIPE|2 ✘ 
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)
        Subsystem: Dell Device [1028:04ba]
        Kernel driver in use: i915
        Kernel modules: i915
--
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Blackcomb [Radeon HD 6970M/6990M] [1002:6720]
        Subsystem: Dell Radeon HD 6990M [1028:04ba]
        Kernel driver in use: radeon
        Kernel modules: radeon
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