** Attachment added: "PCI verbose numeric inventory (device serial numbers redacted)" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2170972/+attachment/6009447/+files/lspci-vnvn.log
** Description changed: Ubuntu 26.04.1 LTS, kernel 7.0.0-38-generic (package 7.0.0-38.38), GNOME Wayland. HP Pavilion Gaming 15-ec1900nc, DMI 15-ec1xxx, board 87B1, Ryzen 5 4600H. ELAN0718:00 04F3:30FD touchpad on AMDI0010:03 / i2c-0, I2C address 0x15, GPIO 11. Expected: touchpad works on normal startup. Actual: ordinary startup fails with "i2c_hid_acpi i2c-ELAN0718:00: failed to fetch HID descriptor: -121". The ACPI/I2C device exists but no functioning touchpad is registered. Reproduction: 1. Boot normally without opening HP startup menu: no touchpad movement/clicks. 2. Reboot, press Esc, then Enter to continue: touchpad works. 3. Remote inspection confirms i2c_hid_acpi binding, hid-multitouch registration and interrupts on the successful boot, with baseline kernel parameters. Originally BIOS F.25; official HP SP156482 update to F.35 was installed in Windows and verified in Ubuntu. Ordinary boot still fails on F.35; Esc -> Enter still works. SecureBoot disabled, Platform Setup Mode. PS/2 AUX is disabled even in the working I2C boot. Failed tests: normal warm reboot; full shutdown and wait; disconnect AC/USB and hold power 15 seconds; driver bind/reload/retries; DesignWare controller rebind; runtime power/control=on; verified i8042.nopnp; runtime bare PS/2 protocol; complete verified boot with i8042.reset i8042.nomux i8042.nopnp i8042.noloop psmouse.proto=bare. The last test creates PS/2 Generic Mouse but physical movement/clicks do not work and I2C -121 persists. POST Hotkey Delay was already 10 seconds. All experimental boot entries have been removed. No custom kernel, ACPI override or persistent driver workaround installed. The extracted touchpad ACPI scope is identical between F.25 and F.35. Detailed failed/working snapshots are available, but differ in both boot path and test parameters; this limitation is explicit. Earlier ordinary baseline boot logs independently show -121. Firmware initialization/handoff is a hypothesis, not an established root cause. A complete ~5,000-word report with a 38-step intervention ledger, 23 related reports, exact logs, good/bad snapshots, GPIO diff, ACPI - excerpts and kernel/PCI information will be attached immediately after - creation. Initial submission with attachment timed out; checking the - account showed no issue was created. + excerpts and kernel/PCI information is attached as REPORT.md and hp- + touchpad-report.zip (39 files). Kernel version_signature and lspci -vnvn + are also attached separately. The ZIP includes SHA256SUMS and + privacy/redaction notes. Related: https://forums.linuxmint.com/viewtopic.php?p=2689052 (same 87B1/4600H platform), https://www.reddit.com/r/pop_os/comments/qmjwyh/ (Esc -> Enter), upstream investigation https://lore- kernel.gnuweeb.org/linux-input/ap8JsxbZDmWxigZv%40eggarch/T/ (87B2/F.35; no confirmed final fix in inspected thread). Potentially related Ubuntu bugs 2161223 and 2165909 have different reported hardware details. Please advise which pre-probe controller/device state to capture or whether a platform quirk can reproduce the initialization performed by the HP startup menu. The owner confirms the laptop is currently working after Esc -> Enter. Report prepared with AI assistance, distinguishing measured output, owner tests and third-party claims. ** Tags added: amd64 hp i2c-hid resolute touchpad -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2170972 Title: HP Pavilion 15-ec1900nc (87B1), ELAN0718: normal boot fails -121; Esc then Enter works on BIOS F.35 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2170972/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
