I've always been a firm believer in having more than one OS installed on my computers at a time, just in case one acts up, explodes or gets corrupted.
Debian 11 has been installed to an external USB SSD drive. After installing the necessary firmware packages, I'm still having some issues. For one, I'm getting a persistent warning in dmesg:
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[ 8.283244] ------------[ cut here ]------------
[ 8.283248] WARNING: CPU: 7 PID: 439 at drivers/platform/x86/apple-gmux.c:680 gmux_probe.cold+0xa5/0x3c6 [apple_gmux]
[ 8.283249] Modules linked in: apple_gmux(+) apple_bl video pcc_cpufreq(-) acpi_cpufreq(-) evdev parport_pc ppdev lp parport fuse configfs efivarfs ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 crc32c_generic amdgpu gpu_sched sd_mod uas usb_storage scsi_mod hid_generic usbhid hid radeon i2c_algo_bit ttm drm_kms_helper cec xhci_pci nvme ehci_pci drm ehci_hcd xhci_hcd tg3 nvme_core libphy t10_pi crc_t10dif crc32_pclmul crc32c_intel crct10dif_generic i2c_i801 thunderbolt ptp usbcore lpc_ich i2c_smbus crct10dif_pclmul pps_core crct10dif_common usb_common button
[ 8.283278] CPU: 7 PID: 439 Comm: systemd-udevd Not tainted 5.10.0-14-amd64 #1 Debian 5.10.113-1
[ 8.283279] Hardware name: Apple Inc. MacPro6,1/Mac-F60DEB81FF30ACF6, BIOS 429.60.3.0.0 10/27/2021
[ 8.283281] RIP: 0010:gmux_probe.cold+0xa5/0x3c6 [apple_gmux]
[ 8.283283] Code: be 70 00 00 00 4c 8d 6c 24 0c 4c 89 ef f3 ab 48 89 ef c7 44 24 1c 02 00 00 00 e8 12 fa ff ff 89 44 24 10 3d ff ff ff 00 7e 0a <0f> 0b c7 44 24 10 ff ff ff 00 4d 89 e8 48 c7 c1 a0 56 f8 c0 48 89
[ 8.283284] RSP: 0018:ffffa807c0da7c48 EFLAGS: 00010212
[ 8.283285] RAX: 0000000004000b00 RBX: 0000000000000004 RCX: 0000000000000000
[ 8.283286] RDX: ffff99034bb4af80 RSI: 0000000000000007 RDI: ffff990341027598
[ 8.283287] RBP: ffff990341027580 R08: 0000000000000007 R09: 0000000000048a81
[ 8.283288] R10: ffffa807c0da7a68 R11: ffff990abff81f28 R12: ffff990341a6a400
[ 8.283288] R13: ffffa807c0da7c54 R14: 0000000000000400 R15: ffffffffc0f846e0
[ 8.283290] FS: 00007f86889338c0(0000) GS:ffff990a9f9c0000(0000) knlGS:0000000000000000
[ 8.283291] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8.283291] CR2: 00005606c16aeef8 CR3: 000000010bb68006 CR4: 00000000001706e0
[ 8.283292] Call Trace:
[ 8.283298] ? kernfs_add_one+0xe2/0x130
[ 8.283303] pnp_device_probe+0xaf/0x140
[ 8.283308] really_probe+0x222/0x480
[ 8.283310] driver_probe_device+0xe1/0x150
[ 8.283312] device_driver_attach+0xa1/0xb0
[ 8.283314] __driver_attach+0x8a/0x150
[ 8.283316] ? device_driver_attach+0xb0/0xb0
[ 8.283318] ? device_driver_attach+0xb0/0xb0
[ 8.283319] bus_for_each_dev+0x78/0xc0
[ 8.283321] bus_add_driver+0x12b/0x1e0
[ 8.283323] driver_register+0x8b/0xe0
[ 8.283324] ? 0xffffffffc0f8a000
[ 8.283327] do_one_initcall+0x44/0x1d0
[ 8.283330] ? do_init_module+0x23/0x240
[ 8.283333] ? kmem_cache_alloc_trace+0xf5/0x200
[ 8.283334] do_init_module+0x4c/0x240
[ 8.283336] __do_sys_finit_module+0xb1/0x110
[ 8.283340] do_syscall_64+0x33/0x80
[ 8.283343] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 8.283344] RIP: 0033:0x7f8688dec9b9
[ 8.283345] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a7 54 0c 00 f7 d8 64 89 01 48
[ 8.283346] RSP: 002b:00007fffb5f69818 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 8.283347] RAX: ffffffffffffffda RBX: 00005606c1845180 RCX: 00007f8688dec9b9
[ 8.283348] RDX: 0000000000000000 RSI: 00007f8688f77e2d RDI: 0000000000000010
[ 8.283349] RBP: 0000000000020000 R08: 0000000000000000 R09: 00005606c16b1750
[ 8.283350] R10: 0000000000000010 R11: 0000000000000246 R12: 00007f8688f77e2d
[ 8.283350] R13: 0000000000000000 R14: 00005606c183cec0 R15: 00005606c1845180
[ 8.283352] ---[ end trace b50ba08f282dd9d0 ]---
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Device: 00:1b.0
Class: Audio device [0403]
Vendor: Intel Corporation [8086]
Device: C600/X79 series chipset High Definition Audio Controller [1d20]
SVendor: Intel Corporation [8086]
SDevice: Device [7270]
Rev: 06
Driver: snd_hda_intel
Module: snd_hda_intel
Are there any tricks I could try to get the proper (non-DisplayPort) sound working? Also, if the dmesg warning is a problem with the kernel, should I report it to the kernel bug tracker, or through the Debian trouble reporter?
uname -a
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Linux debian 5.10.0-14-amd64 #1 SMP Debian 5.10.113-1 (2022-04-29) x86_64 GNU/Linux
Thank you!