Public bug reported: On the HP OmniBook X Flip 16 (board 8DA0/8DA1, Intel Lunar Lake, ELAN2514 touchscreen 04F3:43F0) the touchscreen interrupt never deasserts on Linux. The result is an interrupt storm, a stylus that only reports at ~25 Hz, stuttering or dead touch, and one CPU core that never idles.
This is a separate report from bug 2142384 because that bug is marked Fix Released for an out-of-tree workaround. No Ubuntu kernel contains a fix. == Root cause == HP's ACPI power resource for the touchscreen has inverted logic: \_SB.PC00.I2C4.PTPL._ON: \_SB.SGRA (TPI2, TPIP) // TPIP = T0IP = 0 \_SB.PC00.I2C4.PTPL._OFF: \_SB.SGRA (TPI2, TPIP ^ One) SGRA writes PADCFG0 bit 20 (GPIROUTIOXAPIC) of the touchscreen interrupt pad (GPP_E_18, INTC105D:01 pin 44). The device's _INI sets the bit correctly, then _ON clears it, which disconnects the pad from the IO- APIC. Linux evaluates _ON at probe and on every resume. Windows does not appear to run _ON while _STA already reports the resource on, so it is not affected. == Symptoms == - ~630 interrupts/s on the ELAN2514 IRQ while idle (grep ELAN /proc/interrupts) - i2c_hid_acpi i2c-ELAN2514:00: i2c_hid_get_input: IRQ triggered but there's no data - i2c_hid_acpi i2c-ELAN2514:00: i2c_hid_get_input: incomplete report (67/7167) - pen reports at ~25 Hz (Windows on the same machine: ~268 Hz), touch stalls, false stylus proximity - PADCFG0(GPP_E_18) = 0x80000102 (bit 20 clear) - on some units the touchscreen does not work at all == Fix == Upstream patch posted to the HID maintainers, Cc stable (i2c-hid-acpi re-enables the routing via the firmware's \_SB.SGRA helper at probe and resume, DMI-limited to 8DA0/8DA1): https://patch.msgid.link/[email protected] Tested on board 8DA1, BIOS F.20, Linux 7.2.8: idle IRQ rate 0/s after boot and after s2idle resume, PADCFG0 = 0x80100102, pen, touch and palm rejection work. == Reproduction == Reproduced on Pop!_OS 24.04 with the distribution 7.0.11 and 7.1.5 kernels and with mainline 7.2.2. Another owner of the same board reports the same IRQ storm on Ubuntu 26.04.1 with kernel 7.0.0-31-generic: https://github.com/testyfishy/hp-omnibook-flip16-touchscreen-fix == Request == Please pick up the patch for the Ubuntu kernels once it is accepted upstream. Full analysis, ACPI excerpts and traces: https://github.com/iamwaqargulzar/hp-omnibook-x-flip-16-linux-touchscreen-pen-fix Related: bug 2142384, https://bugzilla.kernel.org/show_bug.cgi?id=220854 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: hp kernel-bug lunar-lake noble patch resolute stylus touchscreen ** Patch added: "Upstream patch v1: HID: i2c-hid-acpi: restore touchscreen IRQ routing on HP OmniBook X Flip 16 (tested on board 8DA1, Linux 7.2.8)" https://bugs.launchpad.net/bugs/2168946/+attachment/6003781/+files/0001-HID-i2c-hid-acpi-restore-touchscreen-IRQ-routing-on-.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2168946 Title: HP OmniBook X Flip 16 (8DA1): firmware disconnects ELAN2514 04F3:43F0 touchscreen IRQ, causing IRQ storm, slow pen (~25 Hz) and broken touch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2168946/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
