XPost: linux.debian.bugs.dist 
 From: enry.vwt3@gmail.com 
  
 Package: src:linux 
 Version: 6.12.41-1 
 Severity: normal 
 X-Debbugs-Cc: enry.vwt3@gmail.com 
  
 Dear Maintainer, 
  
 I am experiencing an issue with the `mtk_t7xx` driver on Debian 13 (Trixie) 
 using kernel 6.12.41+deb13-amd64, where the modem device fails to initialize 
 properly. The kernel logs report that the AT and MBIM ports are not opened, 
 and 
 packets are being dropped: 
  
 [   10.332127] mtk_t7xx 0000:72:00.0: Port AT is not opened, drop packets 
 [   11.008331] mtk_t7xx 0000:72:00.0: Packet drop on channel 0x1004, port 
 not 
 found 
 [   11.163449] mtk_t7xx 0000:72:00.0: Port MBIM is not opened, drop packets 
 [   38.845861] mtk_t7xx 0000:72:00.0: Port MBIM is not opened, drop packets 
 [   38.845897] mtk_t7xx 0000:72:00.0: Port AT is not opened, drop packets 
  
 This happens consistently at boot. The modem is detected, but the 
 communication 
 ports remain closed, preventing any cellular connection via MBIM or AT 
 commands. The problem appears to be with port initialization in the driver. 
  
 **System details**: 
 - Debian GNU/Linux 13 (Trixie) 
 - Kernel: 6.12.41+deb13-amd64 (#1 SMP PREEMPT_DYNAMIC Debian 6.12.41-1, 
 built 
 on 2025-08-12) 
 - Architecture: x86_64 
 - Affected driver: `mtk_t7xx` 
 - Affected hardware: MediaTek T7xx 5G modem (PCI device at 0000:72:00.0) 
  
 **Expected behavior**: 
 - Ports such as MBIM and AT should be initialized and usable after boot, 
 allowing modem control and WWAN connections. 
  
 **Additional context**: 
 - A similar bug has been observed on Ubuntu, where the AT port failed to 
 open 
 at startup: https://bugs.launchpad.net/bugs/2049358 
 - There have also been related upstream issues and CVEs such as: 
   - CVE-2024-39282: Fixes a race condition during driver shutdown 
   - CVE-2024-35909: Fixes a misalignment bug on 64-bit systems 
 - This issue seems related to device/port registration logic within 
 `mtk_t7xx_pci_probe`. 
  
 Please let me know if further debugging, logs (full dmesg or lspci), or 
 testing 
 patches would help. I would be happy to assist in reproducing or validating 
 any 
 fixes. 
  
 Thank you for your work on Debian. 
  
 Best regards, 
  
 Enrique 
  
  
 -- Package-specific info: 
 ** Version: 
 Linux version 6.12.41+deb13-amd64 (debian-kernel@lists.debian.org) 
 (x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for 
 Debian) 2.44) #1 SMP PREEMPT_DYNAMIC Debian 6.12.41-1 (2025-08-12) 
  
 ** Command line: 
 BOOT_IMAGE=/boot/vmlinuz-6.12.41+deb13-amd64 root=UUID=71b35125- 
 27f-4cb2-86cf-79f5fadc937f ro quiet 
  
 ** Not tainted 
  
 ** Kernel log: 
 [    4.842342] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pc 
 0000:00/0000:00:1f.3/sound/card0/input20 
 [    4.842390] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pc 
 0000:00/0000:00:1f.3/sound/card0/input21 
 [    4.842437] input: HDA Intel PCH HDMI/DP,pcm=9 as /devices/pc 
 0000:00/0000:00:1f.3/sound/card0/input22 
 [    4.869335] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 
 [    4.869340] Bluetooth: BNEP filters: protocol multicast 
 [    4.869344] Bluetooth: BNEP socket layer initialized 
 [    4.889337] iwlwifi 0000:00:14.3: base HW address: c4:3d:1a:63:7e:50 
 [    4.904159] mtk_t7xx 0000:72:00.0: Packet drop on channel 0x1004, port 
 not 
 found 
 [    4.905002] mtk_t7xx 0000:72:00.0: Packet drop on channel 0x1012, port 
 not 
 found 
 [    4.996402] nvme nvme0: using unchecked data buffer 
 [    5.003242] block nvme0n1: No UUID available providing old NGUID 
 [    5.059434] NET: Registered PF_QIPCRTR protocol family 
 [    5.406942] iwlwifi 0000:00:14.3 wlp0s20f3: renamed from wlan0 
 [    5.426753] show_signal: 114 callbacks suppressed 
 [    5.426756] traps: eg25-manager[1257] trap int3 ip:7f02ca8e5ab7 
 sp:7ffeb209c300 error:0 in libglib-2.0.so.0.8400.3[66ab7,7f02ca89e000+a1000] 
 [    5.618324] traps: eg25-manager[1268] trap int3 ip:7ff002b83ab7 
 sp:7fffdcb164e0 error:0 in libglib-2.0.so.0.8400.3[66ab7,7ff002b3c000+a1000] 
 [    5.749386] traps: eg25-manager[1273] trap int3 ip:7f8580047ab7 
 sp:7ffee862aea0 error:0 in libglib-2.0.so.0.8400.3[66ab7,7f8580000000+a1000] 
 [    5.952104] audit: type=1400 audit(1757115535.987:123): apparmor="DENIED" 
 operation="open" class="file" profile="/usr/sbin/cupsd" 
 name="/etc/paperspecs" 
 pid=1283 comm="cupsd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 
 [    6.042262] Bluetooth: hci0: Failed to send firmware data (-38) 
 [    6.042982] Bluetooth: hci0: Intel reset sent to retry FW download 
 [    6.045115] usb 3-10: USB disconnect, device number 3 
 [    6.056146] audit: type=1400 audit(1757115536.091:124): apparmor="DENIED" 
 operation="capable" class="cap" profile="/usr/sbin/cupsd" pid=1283 
 comm="cupsd" capability=12  capname="net_admin" 
 [    6.084834] iwlwifi 0000:00:14.3: WFPM_UMAC_PD_NOTIFICATION: 0x20 
 [    6.084886] iwlwifi 0000:00:14.3: WFPM_LMAC2_PD_NOTIFICATION: 0x1f 
 [    6.084897] iwlwifi 0000:00:14.3: WFPM_AUTH_KEY_0: 0x90 
 [    6.084907] iwlwifi 0000:00:14.3: CNVI_SCU_SEQ_DATA_DW9: 0x0 
 [    6.085034] iwlwifi 0000:00:14.3: RFIm is deactivated, reason = 4 
 [    6.180183] iwlwifi 0000:00:14.3: Registered PHC clock: iwlwifi-PTP, with 
 index: 1 
 [    6.405560] iwlwifi 0000:00:14.3: WFPM_UMAC_PD_NOTIFICATION: 0x20 
 [    6.405613] iwlwifi 0000:00:14.3: WFPM_LMAC2_PD_NOTIFICATION: 0x1f 
 [    6.405621] iwlwifi 0000:00:14.3: WFPM_AUTH_KEY_0: 0x90 
 [    6.405631] iwlwifi 0000:00:14.3: CNVI_SCU_SEQ_DATA_DW9: 0x0 
 [    6.407201] iwlwifi 0000:00:14.3: RFIm is deactivated, reason = 4 
 [    6.500283] usb 3-10: new full-speed USB device number 4 using xhci_hcd 
 [    6.645524] usb 3-10: New USB device found, idVendor=8087, 
 idProduct=0033, 
 bcdDevice= 0.00 
 [    6.645530] usb 3-10: New USB device strings: Mfr=0, Product=0, 
 SerialNumber=0 
 [    6.648790] Bluetooth: hci0: Device revision is 0 
 [    6.648794] Bluetooth: hci0: Secure boot is enabled 
 [    6.648796] Bluetooth: hci0: OTP lock is enabled 
 [    6.648796] Bluetooth: hci0: API lock is enabled 
 [    6.648797] Bluetooth: hci0: Debug lock is disabled 
 [    6.648798] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 
 [    6.648799] Bluetooth: hci0: Bootloader timestamp 2019.40 buildtype 1 
 build 
 38 
 [    6.648990] Bluetooth: hci0: DSM reset method type: 0x00 
  
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