Re: Linux 6.13.1: Kernel warning on boot

On 3/31/25 3:44 PM, Michele Bucca ([email protected] via 
lfs-support Mailing List) wrote:
> Hello There
>
> I've compiled the kernel for my UEFI system using the instructions of
> the books (LFS and BLFS) and when it boots it displays some errors (I
> append a kernel log snippet).
> The system boots fine but these errors are annoying and inmho slow the
> system boot. How can I solve the issue?
> I attach a link to my kernel config. I don't know why I've not enabled
> DRM_PANIC and DRM_PANIC_SCREEN. Can this be the reasons?
>
>
> The config file can be found here:
> https://raw.githubusercontent.com/michele13/initramfs/refs/heads/main/prebuilts/bzImage.config
>
>
> --- BEGIN KERNEL LOG ---
> [    7.486610]  drm_dp_dpcd_probe+0x3e/0xf0
> [    7.487155]  intel_dp_read_dprx_caps+0x7c/0x90
> [    7.487703]  intel_dp_init_lttpr_and_dprx_caps+0xbd/0x3a0
> [    7.488253]  intel_dp_get_dpcd+0x20/0x140
> [    7.488806]  intel_dp_detect+0x21b/0x7d0
> [    7.489352]  drm_helper_probe_detect+0x47/0xb0
> [    7.489907]  drm_helper_probe_single_connector_modes+0x405/0x650
> [    7.490459]  drm_client_modeset_probe+0x25a/0x1880
> [    7.491020]  drm_fb_helper_hotplug_event+0xa7/0x100
> [    7.491571]  intel_fbdev_client_hotplug+0x7f/0x100
> [    7.492133]  drm_client_dev_hotplug+0x99/0xf0
> [    7.492688]  i915_hpd_poll_init_work+0x1fc/0x260
> [    7.493247]  process_one_work+0x160/0x390
> [    7.493801]  worker_thread+0x2a0/0x3b0
> [    7.494357]  ? __pfx_worker_thread+0x10/0x10
> [    7.494913]  ? __pfx_worker_thread+0x10/0x10
> [    7.495464]  kthread+0xc8/0xf0
> [    7.496020]  ? __pfx_kthread+0x10/0x10
> [    7.496566]  ret_from_fork+0x2c/0x50
> [    7.497120]  ? __pfx_kthread+0x10/0x10
> [    7.497667]  ret_from_fork_asm+0x1a/0x30
> [    7.498213]  </TASK>
> [    7.498756] ---[ end trace 0000000000000000 ]---
> [    7.527612] ------------[ cut here ]------------
> [    7.528217] i915 0000:00:02.0: [drm] drm_WARN_ON(tc->mode !=
> TC_PORT_TBT_ALT && !tc_phy_is_owned(tc))
> [    7.528221] WARNING: CPU: 7 PID: 64 at
> drivers/gpu/drm/i915/display/intel_tc.c:1757
> __intel_tc_port_lock+0x80/0x100
> [    7.529334] Modules linked in:
> [    7.529894] CPU: 7 UID: 0 PID: 64 Comm: kworker/7:1 Tainted: G
>    W          6.13.1 #1
> [    7.530464] Tainted: [W]=WARN
> [    7.531040] Hardware name: HP HP 240 G8 Notebook PC/868C, BIOS F.10
> 09/18/2020
> [    7.531614] Workqueue: i915-unordered i915_hpd_poll_init_work
> [    7.532189] RIP: 0010:__intel_tc_port_lock+0x80/0x100
> [    7.532768] Code: 5f 50 48 85 db 0f 84 91 00 00 00 e8 ba ca 0a 00
> 48 c7 c1 d0 81 39 b9 48 89 da 48 c7 c7 36 1f 41 b9 48 89 c6 e8 51 99
> 7a ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 48 89 df e8 9b f9 ff
> ff 89
> [    7.533369] RSP: 0000:ffffa6e8402fb8d0 EFLAGS: 00010282
> [    7.533990] RAX: 0000000000000000 RBX: ffff9bff414692c0 RCX: 00000000fffff071
> [    7.534595] RDX: 0000000000000000 RSI: ffffa6e8402fb778 RDI: 0000000000000001
> [    7.535198] RBP: 0000000000000001 R08: 0000000000005235 R09: 00000000fffff071
> [    7.535805] R10: 00000000fffff071 R11: ffffffffb9658b60 R12: ffff9bff410f4000
> [    7.536403] R13: ffff9bff425ac1e8 R14: ffffa6e8402fb9a0 R15: ffff9bff425ac000
> [    7.537008] FS:  0000000000000000(0000) GS:ffff9c02afbc0000(0000)
> knlGS:0000000000000000
> [    7.537605] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    7.538198] CR2: 0000000000000000 CR3: 00000002e782e001 CR4: 0000000000770ef0
> [    7.538804] PKRU: 55555554
> [    7.539378] Call Trace:
> [    7.539948]  <TASK>
> [    7.540506]  ? __warn+0x84/0x130
> [    7.541072]  ? __intel_tc_port_lock+0x80/0x100
> [    7.541630]  ? report_bug+0x164/0x190
> [    7.542184]  ? prb_read_valid+0x16/0x20
> [    7.542744]  ? handle_bug+0x54/0x90
> [    7.543294]  ? exc_invalid_op+0x17/0x70
> [    7.543854]  ? asm_exc_invalid_op+0x1a/0x20
> [    7.544398]  ? __intel_tc_port_lock+0x80/0x100
> [    7.544948]  intel_dp_aux_xfer+0xc2/0x7a0
> [    7.545493]  intel_dp_aux_transfer+0x130/0x330
> [    7.546047]  drm_dp_dpcd_access+0xb3/0x140
> [    7.546593]  drm_dp_dpcd_probe+0x3e/0xf0
> [    7.547139]  intel_dp_read_dprx_caps+0x7c/0x90
> [    7.547685]  intel_dp_init_lttpr_and_dprx_caps+0xbd/0x3a0
> [    7.548237]  intel_dp_get_dpcd+0x20/0x140
> [    7.548787]  intel_dp_detect+0x21b/0x7d0
> [    7.549330]  drm_helper_probe_detect+0x47/0xb0
> [    7.549885]  drm_helper_probe_single_connector_modes+0x405/0x650
> [    7.550435]  drm_client_modeset_probe+0x25a/0x1880
> [    7.550993]  drm_fb_helper_hotplug_event+0xa7/0x100
> [    7.551544]  intel_fbdev_client_hotplug+0x7f/0x100
> [    7.552106]  drm_client_dev_hotplug+0x99/0xf0
> [    7.552657]  i915_hpd_poll_init_work+0x1fc/0x260
> [    7.553209]  process_one_work+0x160/0x390
> [    7.553763]  worker_thread+0x2a0/0x3b0
> [    7.554316]  ? __pfx_worker_thread+0x10/0x10
> [    7.554874]  ? __pfx_worker_thread+0x10/0x10
> [    7.555427]  kthread+0xc8/0xf0
> [    7.555982]  ? __pfx_kthread+0x10/0x10
> [    7.556530]  ret_from_fork+0x2c/0x50
> [    7.557082]  ? __pfx_kthread+0x10/0x10
> [    7.557628]  ret_from_fork_asm+0x1a/0x30
> [    7.558175]  </TASK>
> [    7.558717] ---[ end trace 0000000000000000 ]---
> [    7.587612] ------------[ cut here ]------------

Hi Michele,

As Joe pointed out we could definitely use some more information, but 
here's a couple things that I would try to see if it fixes the problem 
based on the kernel stack trace that you've given us:

First I would try upgrading the kernel to see if it resolves the 
problem. If this doesn't fix it, see below:

However, your HP 240 G8 is going to have Intel Iris Xe graphics in it. I 
would recommend trying to turn on CONFIG_DRM_XE to see if that works if 
upgrading your kernel doesn't fix it. The driver is experimental, but is 
supposed to offer better support for those GPUs. Note that the driver 
will only build as a module, so you will likely need an initramfs.

I noticed that you're on the initial BIOS release for that particular 
model as well, so I decided to look at other patches that are available 
for that. This would be kind of a last resort, but the current is F.80 
and you're on F.10 (which came out in 2020, the recent one came out in 
November of 2024). One of the updates mentions system stability, and 
looking into what other vendors have, that BIOS update shows 
improvements to the Video BIOS for the integrated graphics installed on 
the 11th-generation Intel CPUs.

- Doug

-- 
http://lists.linuxfromscratch.org/sympa/info/lfs-support
Unsubscribe: See the above information page