[REGRESSION] amdgpu fails to load eGPU after 6.19
From: Rio Liu
Date: Mon Apr 13 2026 - 20:17:00 EST
Hello Ilpo,
There seems to be another PCI alignment issue with external amdgpu since 6.19.
Bisecting this time pointed me to this commit
commit bc75c8e5071120e919beb39e69f0979cccfdf219 (HEAD)
Author: Ilpo J<C3><A4>rvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Fri Dec 19 19:40:15 2025 +0200
PCI: Rewrite bridge window head alignment function
It looks like the same issue that has happened before in
https://lore.kernel.org/all/o2bL8MtD_40-lf8GlslTw-AZpUPzm8nmfCnJKvS8RQ3NOzOW1uq1dVCEfRpUjJ2i7G2WjfQhk2IWZ7oGp-7G-jXN4qOdtnyOcjRR0PZWK5I=@r26.me/.
It seems like the previous fix with min_align
https://lore.kernel.org/all/20250822123359.16305-2-ilpo.jarvinen@xxxxxxxxxxxxxxx/
got removed in this commit.
Applying the following patch to the commit fixes the regression. I'm still
looking at how to rebasing it onto latest commit as there is quite a bit of
code change around it. But the same regression still happens as of v7.0-rc7.
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 80e5a8fc62e7..12ab84271214 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1445,7 +1445,7 @@ static void pbus_size_mem(struct pci_bus *bus, unsigned long type,
if (bus->self && size0 &&
!pbus_upstream_space_available(bus, b_res, size0, min_align)) {
- min_align = calculate_head_align(aligns2, max_order);
+ min_align = min(min_align, calculate_head_align(aligns2, max_order));
size0 = calculate_memsize(size, min_size, 0, 0, old_size, win_align);
resource_set_range(b_res, min_align, size0);
pci_info(bus->self, "bridge window %pR to %pR requires relaxed alignment rules\n",
@@ -1459,7 +1459,7 @@ static void pbus_size_mem(struct pci_bus *bus, unsigned long type,
if (bus->self && size1 &&
!pbus_upstream_space_available(bus, b_res, size1, add_align)) {
- min_align = calculate_head_align(aligns2, max_order);
+ min_align = min(min_align, calculate_head_align(aligns2, max_order));
size1 = calculate_memsize(size, min_size, add_size, children_add_size,
old_size, win_align);
pci_info(bus->self,
---
Relevant errors in dmesg:
[ 10.166037] amdgpu: Virtual CRAT table created for CPU
[ 10.166050] amdgpu: Topology: Add CPU node
[ 10.166166] amdgpu 0000:08:00.0: enabling device (0000 -> 0002)
[ 10.166293] amdgpu 0000:08:00.0: initializing kernel modesetting (SIENNA_CICHLID 0x1002:0x73BF 0x148C:0x2406 0xC1).
[ 10.166345] amdgpu 0000:08:00.0: register mmio base: 0x8C000000
[ 10.166347] amdgpu 0000:08:00.0: register mmio size: 1048576
[ 10.173624] wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by 72:13:01:87:79:82
[ 10.174898] amdgpu 0000:08:00.0: detected ip block number 0 <common_v1_0_0> (nv_common)
[ 10.174901] amdgpu 0000:08:00.0: detected ip block number 1 <gmc_v10_0_0> (gmc_v10_0)
[ 10.174903] amdgpu 0000:08:00.0: detected ip block number 2 <ih_v5_0_0> (navi10_ih)
[ 10.174904] amdgpu 0000:08:00.0: detected ip block number 3 <psp_v11_0_0> (psp)
[ 10.174906] amdgpu 0000:08:00.0: detected ip block number 4 <smu_v11_0_0> (smu)
[ 10.174907] amdgpu 0000:08:00.0: detected ip block number 5 <dce_v1_0_0> (dm)
[ 10.174908] amdgpu 0000:08:00.0: detected ip block number 6 <gfx_v10_0_0> (gfx_v10_0)
[ 10.174909] amdgpu 0000:08:00.0: detected ip block number 7 <sdma_v5_2_0> (sdma_v5_2)
[ 10.174911] amdgpu 0000:08:00.0: detected ip block number 8 <vcn_v3_0_0> (vcn_v3_0)
[ 10.174912] amdgpu 0000:08:00.0: detected ip block number 9 <jpeg_v3_0_0> (jpeg_v3_0)
[ 10.278772] amdgpu 0000:08:00.0: Fetched VBIOS from ROM BAR
[ 10.278776] amdgpu 0000:08:00.0: [drm] ATOM BIOS: 113-001-X01
[ 10.308408] amdgpu 0000:08:00.0: Trusted Memory Zone (TMZ) feature disabled as experimental (default)
[ 10.308424] amdgpu 0000:08:00.0: PCIE atomic ops is not supported
[ 10.308433] amdgpu 0000:08:00.0: GPU posting now...
[ 10.308461] amdgpu 0000:08:00.0: MEM ECC is not presented.
[ 10.308462] amdgpu 0000:08:00.0: SRAM ECC is not presented.
[ 10.308484] amdgpu 0000:08:00.0: vm size is 262144 GB, 4 levels, block size is 9-bit, fragment size is 9-bit
[ 10.308522] amdgpu 0000:08:00.0: Problem resizing BAR0 (-22).
[ 10.308529] amdgpu 0000:08:00.0: VRAM: 16368M 0x0000008000000000 - 0x00000083FEFFFFFF (16368M used)
[ 10.308531] amdgpu 0000:08:00.0: GART: 512M 0x0000000000000000 - 0x000000001FFFFFFF
[ 10.308545] resource: resource sanity check: requesting [mem 0x0000000000000000-0xffffffffffffffff], which spans more than PCI Bus 0000:00 [mem 0x000a0000-0x000bffff window]
[ 10.308550] ------------[ cut here ]------------
[ 10.308551] WARNING: arch/x86/mm/pat/memtype.c:721 at memtype_reserve_io+0xfc/0x110, CPU#7: (udev-worker)/606
[ 10.308557] Modules linked in: ccm amdgpu(+) amdxcp drm_panel_backlight_quirks gpu_sched drm_exec snd_hda_codec_atihdmi drm_suballoc_helper drm_ttm_helper ntfs3 vfat fat v4l2loopback(OE) snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi snd_seq_device dm_multipath dm_mod kvmgt mdev vfio_iommu_type1 vfio iommufd crypto_user uinput cmac algif_hash algif_skcipher af_alg uvcvideo videobuf2_vmalloc uvc videobuf2_memops videobuf2_v4l2 btusb videobuf2_common btmtk btrtl videodev btbcm mc btintel snd_hda_codec_intelhdmi snd_hda_codec_hdmi snd_hda_codec_alc269 snd_hda_codec_realtek_lib snd_hda_scodec_component snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl joydev snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda intel_rapl_msr soundwire_cadence intel_rapl_common snd_sof_pci snd_sof_xtensa_dsp intel_uncore_frequency intel_uncore_frequency_common snd_sof snd_sof_utils snd_soc_acpi_intel_match
[ 10.308591] snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation snd_soc_sdw_utils snd_soc_acpi intel_tcc_cooling soundwire_bus x86_pkg_temp_thermal intel_powerclamp snd_soc_sdca coretemp crc8 snd_soc_avs kvm_intel snd_soc_hda_codec mousedev snd_hda_ext_core kvm r8169 snd_hda_codec nvme 8021q irqbypass realtek snd_hda_core ghash_clmulni_intel rtsx_pci_sdmmc aesni_intel nvme_core snd_intel_dspcfg garp mdio_devres snd_intel_sdw_acpi spi_nor iwlmvm mrp iTCO_wdt rapl nvme_keyring stp mmc_core libphy intel_cstate nvme_auth snd_hwdep hid_multitouch mei_hdcp mei_pxp ee1004 intel_pmc_bxt mtd intel_wmi_thunderbolt llc clevo_xsm_wmi(OE) i915 intel_uncore snd_soc_core thunderbolt mdio_bus i2c_hid_acpi hkdf mac80211 rtsx_pci i2c_hid snd_compress drm_buddy ptp ac97_bus ttm pps_core snd_pcm_dmaengine i2c_algo_bit intel_oc_wdt libarc4 intel_pmc_core drm_display_helper snd_pcm pmt_telemetry cec pmt_discovery iwlwifi snd_timer i2c_i801 intel_lpss_pci intel_gtt pmt_class mei_me spi_intel_pci i2c_smbus snd intel_lpss
[ 10.308633] intel_pmc_ssram_telemetry intel_hid psmouse spi_intel video idma64 soundcore mei intel_pch_thermal i2c_mux intel_vsec pcspkr mac_hid serio_raw sparse_keymap wmi acpi_pad bnep cfg80211 bluetooth rfkill
[ 10.308645] CPU: 7 UID: 0 PID: 606 Comm: (udev-worker) Tainted: G S OE 7.0.0-rc7 #21 PREEMPT(full) 78435afb69b0b07f3561902db6ca6395f9133c11
[ 10.308648] Tainted: [S]=CPU_OUT_OF_SPEC, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 10.308649] Hardware name: COPELION INTERNATIONAL INC. ZX Series/ZX Series, BIOS 1.07.14RCOP1 12/29/2020
[ 10.308650] RIP: 0010:memtype_reserve_io+0xfc/0x110
[ 10.308652] Code: aa fb ff ff b8 f0 ff ff ff eb 88 8b 54 24 04 4c 89 ee 48 89 df e8 04 fe ff ff 85 c0 75 db 8b 54 24 04 41 89 16 e9 69 ff ff ff <0f> 0b e9 4b ff ff ff e8 48 d2 09 01 0f 1f 84 00 00 00 00 00 90 90
[ 10.308654] RSP: 0018:ffffcf4781c736d0 EFLAGS: 00010286
[ 10.308655] RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 0000000000000027
[ 10.308657] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff9b5f5e70
[ 10.308657] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffefff
[ 10.308658] R10: ffffffff9a85fac0 R11: ffffcf4781c73548 R12: 0000000000000001
[ 10.308659] R13: 0000000000000000 R14: ffffcf4781c7371c R15: 0000000000000001
[ 10.308660] FS: 00007fdda0fa5c80(0000) GS:ffff8b4d39075000(0000) knlGS:0000000000000000
[ 10.308662] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 10.308662] CR2: 00007ffd23cf0ff0 CR3: 0000000109bfa005 CR4: 00000000003726f0
[ 10.308664] Call Trace:
[ 10.308665] <TASK>
[ 10.308666] arch_io_reserve_memtype_wc+0x31/0x50
[ 10.308670] amdgpu_bo_init+0x3e/0x90 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.309129] ? amdgpu_gmc_get_vbios_allocations+0xa9/0x140 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.309416] gmc_v10_0_sw_init+0x352/0x5d0 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.309721] amdgpu_device_init.cold+0x1612/0x22f8 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.310080] ? pci_conf1_read+0xb2/0x100
[ 10.310084] ? pci_bus_read_config_word+0x4c/0x80
[ 10.310087] amdgpu_driver_load_kms+0x19/0x80 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.310352] amdgpu_pci_probe+0x233/0x480 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.310610] local_pci_probe+0x3e/0x90
[ 10.310614] pci_device_probe+0xe1/0x260
[ 10.310616] ? sysfs_do_create_link_sd+0x6d/0xd0
[ 10.310619] really_probe+0xde/0x380
[ 10.310622] __driver_probe_device+0x78/0x150
[ 10.310624] driver_probe_device+0x1f/0xa0
[ 10.310625] ? __pfx___driver_attach+0x10/0x10
[ 10.310627] __driver_attach+0xcb/0x210
[ 10.310628] bus_for_each_dev+0x85/0xd0
[ 10.310632] bus_add_driver+0x118/0x200
[ 10.310634] ? __pfx_amdgpu_init+0x10/0x10 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.310890] driver_register+0x75/0xe0
[ 10.310893] ? amdgpu_init+0x36/0xff0 [amdgpu 9e1de60160a9bdc6283126cc89fe53e3272a6751]
[ 10.311150] do_one_initcall+0x5d/0x330
[ 10.311155] do_init_module+0x62/0x250
[ 10.311158] ? init_module_from_file+0xd8/0x140
[ 10.311160] init_module_from_file+0xd8/0x140
[ 10.311163] idempotent_init_module+0x114/0x310
[ 10.311166] __x64_sys_finit_module+0x71/0xe0
[ 10.311167] do_syscall_64+0x11c/0x15f0
[ 10.311170] ? alloc_fd+0x12e/0x190
[ 10.311172] ? do_sys_openat2+0x9a/0xe0
[ 10.311175] ? __x64_sys_openat+0x61/0xa0
[ 10.311177] ? do_syscall_64+0x11c/0x15f0
[ 10.311179] ? alloc_fd+0x12e/0x190
[ 10.311180] ? do_sys_openat2+0x9a/0xe0
[ 10.311182] ? __x64_sys_openat+0x61/0xa0
[ 10.311184] ? do_syscall_64+0x11c/0x15f0
[ 10.311186] ? do_syscall_64+0x2d6/0x15f0
[ 10.311187] ? do_syscall_64+0x11c/0x15f0
[ 10.311189] ? clear_bhb_loop+0x30/0x80
[ 10.311191] ? clear_bhb_loop+0x30/0x80
[ 10.311192] ? clear_bhb_loop+0x30/0x80
[ 10.311193] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 10.311195] RIP: 0033:0x7fdda10b967d
[ 10.311197] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 63 16 0d 00 f7 d8 64 89 01 48
[ 10.311198] RSP: 002b:00007ffea5c85328 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 10.311200] RAX: ffffffffffffffda RBX: 000055c8dfdae250 RCX: 00007fdda10b967d
[ 10.311201] RDX: 0000000000000004 RSI: 00007fdda0f5b2f2 RDI: 0000000000000018
[ 10.311202] RBP: 00007ffea5c853c0 R08: 0000000000000000 R09: 0000000000000000
[ 10.311203] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000020000
[ 10.311204] R13: 000055c8dfdb3130 R14: 000055c8dfdae250 R15: 0000000000000000
[ 10.311205] </TASK>
[ 10.311206] ---[ end trace 0000000000000000 ]---
[ 10.311208] [drm:amdgpu_bo_init [amdgpu]] *ERROR* Unable to set WC memtype for the aperture base
[ 10.311476] amdgpu 0000:08:00.0: sw_init of IP block <gmc_v10_0> failed -22
[ 10.311477] amdgpu 0000:08:00.0: amdgpu_device_ip_init failed
[ 10.311478] amdgpu 0000:08:00.0: Fatal error during GPU init
[ 10.311480] amdgpu 0000:08:00.0: finishing device.
[ 10.311825] amdgpu 0000:08:00.0: probe with driver amdgpu failed with error -22
Best,
Rio