I connected 2 4K screens,on HDMI and one USB-C alternate to HDMI-
Both screens are 42"-
The HDMI connection displays correctly 3840x2160 42"
The USB-C to HDMI only reads 32" 1920x1080 and has lots of artefacts. if this screen is marked as primary kicker becomes extrmely slow. The login screen on the USB-C screen is completly distorted.
Both work fine with Windows
So I did some
manual xrandr trial if I could the mode manually but it doesn’t
efivarfs
4787.582018] WARNING: CPU: 2 PID: 1876 at drivers/dma-buf/dma-buf.c:903 dma_buf_unpin+0x22/0x30
4787.582024] Modules linked in: ccm udp_diag tcp_diag inet_diag rfcomm nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_
chain_nat nf_tables ebtable_nat ebtable_broute ip6table_nat ip6table_mangle af_packet ip6table_raw ip6table_security cmac iptable_nat nf_nat algif_hash algif_skcipher af_alg nf_conntrack n
f_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security bnep r8153_ecm cdc_ether ip_set usbnet nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables r8152 btusb btr
tl mii iptable_filter btbcm ip_tables btintel x_tables intel_rapl_msr usbhid bpfilter bluetooth ecdh_generic ecc uas uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_co
mmon usb_storage dmi_sysfs intel_rapl_common squashfs rtw88_8822ce rtw88_8822c edac_mce_amd rtw88_pci rtw88_core kvm_amd snd_hda_codec_realtek mac80211 kvm snd_hda_codec_generic ledtrig_au
dio snd_hda_codec_hdmi irqbypass snd_hda_intel snd_intel_dspcfg
4787.582060] snd_intel_sdw_acpi snd_hda_codec snd_hda_core cfg80211 snd_hwdep snd_pcm pcspkr r8169 asus_nb_wmi asus_wmi sparse_keymap wmi_bmof efi_pstore snd_timer realtek mdio_devres s
p5100_tco ucsi_acpi snd_rn_pci_acp3x joydev rfkill k10temp i2c_piix4 snd_pci_acp3x libphy snd libarc4 typec_ucsi soundcore i2c_nvidia_gpu typec thermal roles nls_iso8859_1 nls_cp437 ac acp
i_cpufreq asus_wireless tiny_power_button vfat fat loop fuse configfs xfs libcrc32c amdgpu hid_multitouch hid_generic nouveau mxm_wmi drm_ttm_helper ttm iommu_v2 gpu_sched i2c_algo_bit drm
_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec xhci_pci rc_core xhci_pci_renesas xhci_hcd crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel drm nvme aesni_intel
usbcore crypto_simd ccp cryptd nvme_core serio_raw wmi battery video i2c_hid_acpi i2c_hid button v4l2loopback(O) videodev mc sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua m
sr efivarfs
4787.582101] CPU: 2 PID: 1876 Comm: Xorg.bin Tainted: G W O 5.12.4-2-default #1 openSUSE Tumbleweed
4787.582103] Hardware name: ASUSTeK COMPUTER INC. ASUS TUF Gaming A17 FA706IU_FA706IU/FA706IU, BIOS FA706IU.316 03/12/2021
4787.582104] RIP: 0010:dma_buf_unpin+0x22/0x30
4787.582106] Code: 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 83 7f 30 00 48 8b 07 74 13 48 8b 40 20 48 8b 40 20 48 85 c0 74 05 e9 1f 4c 6a 00 c3 <0f> 0b eb e9 66 2e 0f 1f 84 00 00 00 00
00 0f 1f 44 00 00 48 85 ff
4787.582108] RSP: 0018:ffff95c8c1b37d00 EFLAGS: 00010246
4787.582109] RAX: ffff8a8194573000 RBX: 0000000000000020 RCX: 00000000810000ef
4787.582110] RDX: 00000000810000f0 RSI: 00000000810000ef RDI: ffff8a81aa2baea0
4787.582110] RBP: ffff8a81aa2baea0 R08: 0000000000000001 R09: 0000000000000001
4787.582111] R10: 00000003be9d8000 R11: 00000000a37dc000 R12: ffff8a8194573000
4787.582112] R13: ffff8a80c4dc0d28 R14: ffff8a80c4dc0c38 R15: 000000000000000c
4787.582113] FS: 00007f686dc07940(0000) GS:ffff8a83df480000(0000) knlGS:0000000000000000
4787.582114] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
4787.582115] CR2: 00002ba4050739c0 CR3: 0000000139604000 CR4: 0000000000350ee0
4787.582116] Call Trace:
4787.582118] dma_buf_detach+0x78/0x100
4787.582122] drm_prime_gem_destroy+0x2d/0x40 [drm]
4787.582141] nouveau_gem_object_del+0x49/0x80 [nouveau]
4787.582192] drm_gem_object_release_handle+0x6b/0x80 [drm]
4787.582207] drm_gem_handle_delete+0x58/0x90 [drm]
4787.582222] ? drm_gem_handle_create+0x40/0x40 [drm]
4787.582237] drm_ioctl_kernel+0xaa/0xf0 [drm]
4787.582252] drm_ioctl+0x201/0x3d0 [drm]
4787.582266] ? drm_gem_handle_create+0x40/0x40 [drm]
4787.582281] ? __switch_to_asm+0x42/0x70
4787.582284] ? __switch_to+0x11b/0x450
4787.582286] nouveau_drm_ioctl+0x55/0xa0 [nouveau]
4787.582329] __x64_sys_ioctl+0x82/0xb0
4787.582333] do_syscall_64+0x33/0x80
4787.582336] entry_SYSCALL_64_after_hwframe+0x44/0xae
4787.582338] RIP: 0033:0x7f686e14c00b
4787.582339] Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 35
be 0c 00 f7 d8 64 89 01 48
4787.582340] RSP: 002b:00007fffdce50958 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
4787.582341] RAX: ffffffffffffffda RBX: 00007fffdce50990 RCX: 00007f686e14c00b
4787.582342] RDX: 00007fffdce50990 RSI: 0000000040086409 RDI: 0000000000000018
4787.582343] RBP: 0000000040086409 R08: 0000557455793930 R09: 00005574557d8fb0
4787.582343] R10: 0000000000c00000 R11: 0000000000000246 R12: 00005574557936e0
4787.582344] R13: 0000000000000018 R14: 0000557455793848 R15: 00005574557c2840
4787.582346] --- end trace 98bddb1ab775eddb ]---
I tried Ubuntu 21.04 but the screen doesn’t even start.
The USB-C isn’t even hot pluggable only works if the system starts up.