Hello! I've been recently scouring through journalctl because of another error and found this kernel error multiple times: Nov 09 17:49:35 Leonidas kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun They started happening around beginning of November 2018 and occur without further kernel messages around them. They also happen very irregularly and there is no visible sign (as screen flickering or similar) of the error. I have a Lenovo T470p (Kaby Lake with discrete Nvidia 940MX card) running Arch Linux with gnome on wayland and currently xf86-video-intel version 2.99.917+860+g3a2dec17. The appearance of the error messages sort of match with the update of xf86-video-intel from version 2.99.917+847+g25c9a2fc to 2.99.917+853+g0932a6b3 end of October 2018. I've seen on the bug tracker[1] that there are multiple open issues where this kernel error appears, but I do not see any visual signs so I don't know where this belongs. I do not use any external monitors, though. As I do not have any impairements of usability I consider this low priority, but if I can be of any assistance, let me know. Output of journalctl -p err | grep "drm:intel_cpu" | wc --> 29 occurences The first occurence was on Nov 2 2018. In the attachment you can see two possibly interesting kernel messages around the error, although the second one is around a different error: Dec 15 21:55:19 Leonidas kernel: [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training This error occured only twice mid Decembre. If I can help with this report or should post it somewhere else, please let me know. Kind regards, Max [1] https://bugs.freedesktop.org/buglist.cgi?quicksearch=CPU%20fifo%20underrun
Nov 09 17:49:34 Leonidas kernel: L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. Nov 09 17:49:35 Leonidas kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun ------------------- Dec 15 21:54:56 Leonidas kernel: bbswitch: enabling discrete graphics Dec 15 21:54:56 Leonidas kernel: ipmi message handler version 39.2 Dec 15 21:54:56 Leonidas kernel: ipmi device interface Dec 15 21:54:57 Leonidas kernel: nvidia: module license 'NVIDIA' taints kernel. Dec 15 21:54:57 Leonidas kernel: Disabling lock debugging due to kernel taint Dec 15 21:54:57 Leonidas kernel: nvidia-nvlink: Nvlink Core is being initialized, major device number 236 Dec 15 21:54:57 Leonidas kernel: NVRM: loading NVIDIA UNIX x86_64 Kernel Module 415.23 Thu Dec 6 21:34:12 CST 2018 (using threaded interrupts) Dec 15 21:54:57 Leonidas kernel: nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 415.23 Thu Dec 6 21:26:05 CST 2018 Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998528] [WARN][XORG] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/misc". Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998556] [WARN][XORG] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/OTF". Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998563] [WARN][XORG] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/100dpi". Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998568] [WARN][XORG] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi". Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998579] [WARN][XORG] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory) Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998588] [WARN][XORG] (WW) Warning, couldn't open module mouse Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998603] [WARN][XORG] (WW) NVIDIA(0): Unable to get display device for DPI computation. Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998612] [WARN][XORG] (WW) NVIDIA(0): Option "NoLogo" is not used Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998626] [WARN][XORG] (WW) Warning, couldn't open module mouse Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998639] [ERROR][XORG] (EE) PreInit returned 2 for "<default pointer>" Dec 15 21:54:57 Leonidas bumblebeed[622]: [79069.998647] [ERROR][XORG] (EE) PreInit returned 2 for "<default keyboard>" Dec 15 21:54:57 Leonidas kernel: nvidia-modeset: Unloading Dec 15 21:54:57 Leonidas kernel: nvidia-nvlink: Unregistered the Nvlink Core, major device number 236 Dec 15 21:54:57 Leonidas kernel: bbswitch: disabling discrete graphics Dec 15 21:54:58 Leonidas kernel: pci 0000:02:00.0: Refused to change power state, currently in D0 Dec 15 21:55:06 Leonidas kernel: drm: not enough stolen space for compressed buffer (need 29491200 more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this. Dec 15 21:55:13 Leonidas kernel: [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS. Dec 15 21:55:19 Leonidas kernel: [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training Dec 15 21:55:21 Leonidas kernel: [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
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