iwlwifi PCI timeout

Message

robinelvin · Post by **robinelvin** » Tue Sep 09, 2025 8:07 am

My laptop has an Intel wireless device onboard and it has been problematic with any Linux distro I have tried. It works for a short time after a power cycle but then stops working.

After moving over to Gentoo I have dug a little deeper and it appears to be suffering from the power-saving issue where it disappears from the PCI bus and the iwlwifi driver cannot reconnect any more. I am using the current Distribution Kernel so no custom config.

Code: Select all

[  259.627375] ------------[ cut here ]------------
[  259.627385] Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff)
[  259.627484] WARNING: CPU: 3 PID: 0 at drivers/net/wireless/intel/iwlwifi/pcie/trans.c:2251 __iwl_trans_pcie_grab_nic_access+0x14c/0x150 [iwlwifi]
[  259.627554] Modules linked in: xt_conntrack xt_MASQUERADE bridge ip6table_nat ip6table_filter ip6_tables xt_set ip_set iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_addrtype iptable_filter ip_tables nfnetlink overlay amdgpu amdxcp gpu_sched drm_exec 8021q garp mrp stp llc vfat fat intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp binfmt_misc coretemp iwlmvm mac80211 snd_ctl_led snd_hda_codec_realtek kvm_intel snd_hda_codec_generic libarc4 spi_nor i915 jc42 snd_hda_scodec_component mtd snd_hda_codec_hdmi iwlwifi uvcvideo btusb kvm btrtl uvc videobuf2_vmalloc at24 snd_hda_intel radeon btintel videobuf2_memops snd_intel_dspcfg videobuf2_v4l2 spi_intel_platform ppdev iTCO_wdt btbcm intel_pmc_bxt snd_intel_sdw_acpi btmtk videobuf2_common irqbypass mei_hdcp mei_wdt spi_intel mei_pxp videodev cfg80211 rapl iTCO_vendor_support hp_wmi snd_hda_codec bluetooth sparse_keymap intel_cstate drm_suballoc_helper i2c_algo_bit platform_profile snd_hda_core drm_ttm_helper i2c_i801 wmi_bmof rfkill
[  259.627732]  intel_uncore mc joydev pcspkr ttm i2c_smbus snd_hwdep snd_pcm drm_display_helper parport_pc snd_timer parport snd cec mei_me drm_buddy e1000e hp_accel soundcore mei lpc_ich lis3lv02d wireless_hotkey tpm_infineon serio_raw rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel sha512_ssse3 sha256_ssse3 sha1_ssse3 rtsx_pci video wmi
[  259.627815] CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.12.34-gentoo-dist #1
[  259.627824] Hardware name: Hewlett-Packard HP ZBook 15 G2/2253, BIOS M70 Ver. 01.12 09/23/2015
[  259.627829] RIP: 0010:__iwl_trans_pcie_grab_nic_access+0x14c/0x150 [iwlwifi]
[  259.627871] Code: 48 f8 31 c0 e9 7b ff ff ff 31 f6 48 89 df e8 9b fd ff ff eb e5 89 c6 48 c7 c7 e0 75 f4 c0 c6 05 2d 4e 02 00 01 e8 f4 9b 1f f7 <0f> 0b eb a3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f
[  259.627878] RSP: 0018:ffffcefd40250ce8 EFLAGS: 00010282
[  259.627886] RAX: 0000000000000000 RBX: ffff8a3f45bf8028 RCX: 0000000000000027
[  259.627891] RDX: ffff8a42dfda18c8 RSI: 0000000000000001 RDI: ffff8a42dfda18c0
[  259.627896] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[  259.627900] R10: 667830204c52544e R11: 2966666666666666 R12: 00000000ffffffff
[  259.627904] R13: ffff8a3f45bf9c94 R14: 0000000000000001 R15: 0000000000000011
[  259.627910] FS:  0000000000000000(0000) GS:ffff8a42dfd80000(0000) knlGS:0000000000000000
[  259.627916] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  259.627921] CR2: 0000559a538f5d18 CR3: 000000045682c006 CR4: 00000000001726f0
[  259.627926] Call Trace:
[  259.627932]  <IRQ>
[  259.627938]  iwl_trans_pcie_grab_nic_access+0x1c/0x70 [iwlwifi]
[  259.627978]  iwl_read_prph+0x15/0x50 [iwlwifi]
[  259.628005]  iwl_txq_log_scd_error+0x143/0x290 [iwlwifi]
[  259.628040]  ? ttwu_do_activate+0x8a/0x270
[  259.628055]  iwl_txq_log_scd_error+0x271/0x290 [iwlwifi]
[  259.628089]  ? iwl_txq_log_scd_error+0x230/0x290 [iwlwifi]
[  259.628121]  ? iwl_txq_log_scd_error+0x230/0x290 [iwlwifi]
[  259.628152]  call_timer_fn+0x2a/0x120
[  259.628162]  __run_timers+0x1f1/0x280
[  259.628172]  timer_expire_remote+0x50/0x80
[  259.628182]  tmigr_handle_remote+0x3e6/0x4a0
[  259.628199]  handle_softirqs+0xf4/0x340
[  259.628210]  ? sched_clock_cpu+0xf/0x1f0
[  259.628223]  __irq_exit_rcu+0x97/0xb0
[  259.628233]  sysvec_apic_timer_interrupt+0x71/0x90
[  259.628245]  </IRQ>
[  259.628247]  <TASK>
[  259.628250]  asm_sysvec_apic_timer_interrupt+0x1a/0x20
[  259.628258] RIP: 0010:cpuidle_enter_state+0xd3/0x690
[  259.628270] Code: 00 00 e8 a0 70 e1 fe e8 6b ee ff ff 49 89 c6 0f 1f 44 00 00 31 ff e8 ac d6 df fe 45 84 ff 0f 85 13 02 00 00 fb 0f 1f 44 00 00 <45> 85 ed 0f 88 e3 01 00 00 4d 63 e5 49 83 fc 0a 0f 83 c8 04 00 00
[  259.628275] RSP: 0018:ffffcefd40123e68 EFLAGS: 00000246
[  259.628281] RAX: ffff8a42dfd80000 RBX: ffff8a42dfdc3bf8 RCX: 0000000000000000
[  259.628285] RDX: 0000003c71cfd569 RSI: 0000000033518eeb RDI: 0000000000000000
[  259.628290] RBP: ffffffffbab57920 R08: 00000000000a31ec R09: 000000000007a120
[  259.628294] R10: 0000000000000000 R11: 0000000000000006 R12: 0000000000000005
[  259.628298] R13: 0000000000000005 R14: 0000003c71cfd569 R15: 0000000000000000
[  259.628306]  ? cpuidle_enter_state+0xc4/0x690
[  259.628318]  cpuidle_enter+0x2d/0x40
[  259.628328]  do_idle+0x1b0/0x210
[  259.628340]  cpu_startup_entry+0x29/0x30
[  259.628351]  start_secondary+0x12d/0x160
[  259.628360]  common_startup_64+0x13e/0x141
[  259.628371]  </TASK>
[  259.628373] ---[ end trace 0000000000000000 ]---

There are no power-saving options in the BIOS and /sys/bus/pci/devices/0000:3d:00.0/power/control is already set to '1'. If there is anything else I can try please let me know. Alternatively I'd like to switch to using a USB WiFi adapter if there is a way to blacklist the onboard adapter.[/code]

Post by **NeddySeagoon** » Tue Sep 09, 2025 11:04 am

robinelvin,

Code: Select all

$ grep -R -i module_p /usr/src/linux/drivers/net/wireless/intel/iwlwifi/*
/usr/src/linux/drivers/net/wireless/intel/iwlwifi/dvm/power.c:module_param(force_cam, bool, 0644);
/usr/src/linux/drivers/net/wireless/intel/iwlwifi/dvm/power.c:MODULE_PARM_DESC(force_cam, "force continuously aware mode (no power saving at all)");

The module has a no power saving knob. It needs to be set at module load time, whenever that is for you.

Code: Select all

iwlwifi.force_cam=1

on the kernel command line may work.

robinelvin · Post by **robinelvin** » Tue Sep 09, 2025 1:03 pm

Thank you NeddySeagoon - I didn't know there was a module option. I have set the option like this:

/etc/modules.d/iwlwifi.conf

Code: Select all

options iwlwifi force_cam=1

I've had it running for a couple of hours and it seems to have sorted the problem.