*********** MASS BUG UPDATE **************
We apologize for the inconvenience. There are a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 27 kernel bugs.
Fedora 27 has now been rebased to 4.17.7-100.fc27. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel.
If you have moved on to Fedora 28, and are still experiencing this issue, please change the version to Fedora 28.
If you experience different issues, please open a new bug report for those.
*********** MASS BUG UPDATE **************
This bug is being closed with INSUFFICIENT_DATA as there has not been a response in 5 weeks. If you are still experiencing this issue, please reopen and attach the relevant data from the latest kernel you are running and any data that might have been requested previously.
Created attachment 1423277 [details] output of alsa-info.sh Description of problem: HDMI audio issues. Includes skips, delays in playing. About 25% of the time encountering issues. 75% works. HDMI audio takes a few moments to start playing and audio in the beginning is not heard. At least for 1 to 4 seconds consistently. I encounter the issues with several different applications, so it seems to not be limited to one application. Noticed this message repeated in /var/log/messages when audio was having issues: kernel: snd_hda_codec_hdmi hdaudioC0D2: HDMI: audio coding type 0 not expected Version-Release number of selected component (if applicable): Fedora 27 Linux shed 4.15.16-300.fc27.x86_64 #1 SMP Mon Apr 9 17:50:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux How reproducible: Almost consistently. Set sound to use HDMI and play audio. Additional info: Thinkpad T460s $ lspci 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 08) 00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07) 00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model 00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21) 00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21) 00:16.3 Serial controller: Intel Corporation Device 9d3d (rev 21) 00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21) 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 (rev f1) 00:1c.2 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #3 (rev f1) 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21) 00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) 00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21) 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-LM (rev 21) 02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01) 04:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a) $ lsmod Module Size Used by tun 40960 2 bnep 24576 2 fuse 122880 3 ip6t_rpfilter 16384 1 ip6t_REJECT 16384 2 nf_reject_ipv6 16384 1 ip6t_REJECT xt_conntrack 16384 13 ip_set 45056 0 nfnetlink 16384 1 ip_set ebtable_nat 16384 1 ebtable_broute 16384 1 bridge 188416 1 ebtable_broute stp 16384 1 bridge llc 16384 2 bridge,stp ip6table_nat 16384 1 nf_conntrack_ipv6 16384 8 nf_defrag_ipv6 36864 1 nf_conntrack_ipv6 nf_nat_ipv6 16384 1 ip6table_nat ip6table_mangle 16384 1 ip6table_raw 16384 1 ip6table_security 16384 1 iptable_nat 16384 1 nf_conntrack_ipv4 16384 7 nf_defrag_ipv4 16384 1 nf_conntrack_ipv4 nf_nat_ipv4 16384 1 iptable_nat nf_nat 36864 2 nf_nat_ipv6,nf_nat_ipv4 nf_conntrack 151552 6 nf_conntrack_ipv6,nf_conntrack_ipv4,nf_nat_ipv6,xt_conntrack,nf_nat_ipv4,nf_nat iptable_mangle 16384 1 iptable_raw 16384 1 iptable_security 16384 1 ebtable_filter 16384 1 ebtables 36864 3 ebtable_filter,ebtable_nat,ebtable_broute ip6table_filter 16384 1 ip6_tables 32768 5 ip6table_mangle,ip6table_filter,ip6table_security,ip6table_raw,ip6table_nat vboxpci 28672 0 vboxnetadp 28672 0 vboxnetflt 32768 0 vboxdrv 483328 3 vboxnetadp,vboxnetflt,vboxpci sunrpc 397312 1 arc4 16384 2 snd_hda_codec_hdmi 57344 1 snd_usb_audio 221184 2 snd_usbmidi_lib 32768 1 snd_usb_audio uvcvideo 102400 0 snd_rawmidi 36864 1 snd_usbmidi_lib intel_rapl 24576 0 videobuf2_vmalloc 16384 1 uvcvideo x86_pkg_temp_thermal 16384 0 intel_powerclamp 16384 0 coretemp 16384 0 videobuf2_memops 16384 1 videobuf2_vmalloc btusb 53248 0 btrtl 16384 1 btusb btbcm 16384 1 btusb btintel 16384 1 btusb videobuf2_v4l2 28672 1 uvcvideo kvm_intel 233472 0 iwlmvm 425984 0 videobuf2_core 45056 2 uvcvideo,videobuf2_v4l2 snd_soc_skl 102400 0 videodev 208896 3 uvcvideo,videobuf2_core,videobuf2_v4l2 bluetooth 593920 11 btrtl,btintel,bnep,btbcm,btusb snd_soc_skl_ipc 73728 1 snd_soc_skl mac80211 888832 1 iwlmvm snd_hda_ext_core 28672 1 snd_soc_skl snd_soc_sst_dsp 36864 1 snd_soc_skl_ipc snd_soc_sst_ipc 16384 1 snd_soc_skl_ipc snd_soc_acpi 16384 1 snd_soc_skl kvm 700416 1 kvm_intel snd_soc_core 282624 1 snd_soc_skl snd_hda_codec_realtek 110592 1 media 45056 2 uvcvideo,videodev snd_hda_codec_generic 86016 1 snd_hda_codec_realtek iwlwifi 249856 1 iwlmvm snd_compress 24576 1 snd_soc_core mei_wdt 16384 0 iTCO_wdt 16384 0 snd_pcm_dmaengine 16384 1 snd_soc_core iTCO_vendor_support 16384 1 iTCO_wdt ac97_bus 16384 1 snd_soc_core ecdh_generic 24576 1 bluetooth snd_hda_intel 45056 5 wmi_bmof 16384 0 irqbypass 16384 1 kvm crct10dif_pclmul 16384 0 snd_hda_codec 151552 4 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek crc32_pclmul 16384 0 ghash_clmulni_intel 16384 0 snd_hda_core 94208 7 snd_hda_intel,snd_hda_codec,snd_hda_ext_core,snd_soc_skl,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek intel_cstate 16384 0 snd_hwdep 20480 2 snd_hda_codec,snd_usb_audio intel_uncore 131072 0 snd_seq 81920 0 cfg80211 733184 3 iwlmvm,iwlwifi,mac80211 intel_rapl_perf 16384 0 snd_seq_device 16384 2 snd_seq,snd_rawmidi snd_pcm 118784 10 snd_hda_intel,snd_hda_codec,snd_usb_audio,snd_pcm_dmaengine,snd_hda_ext_core,snd_hda_core,snd_soc_skl,snd_hda_codec_hdmi,snd_soc_core snd_timer 36864 2 snd_seq,snd_pcm thinkpad_acpi 98304 1 rtsx_pci_ms 20480 0 memstick 16384 1 rtsx_pci_ms joydev 24576 0 mei_me 45056 0 snd 94208 29 snd_compress,snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_usb_audio,snd_timer,thinkpad_acpi,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_usbmidi_lib,snd_seq_device,snd_hda_codec_realtek,snd_soc_core,snd_pcm tpm_tis 16384 0 soundcore 16384 1 snd tpm_tis_core 20480 1 tpm_tis i2c_i801 28672 0 mei 106496 2 mei_me,mei_wdt shpchp 40960 0 intel_pch_thermal 16384 0 tpm 65536 2 tpm_tis,tpm_tis_core wmi 28672 1 wmi_bmof rfkill 28672 7 bluetooth,thinkpad_acpi,cfg80211 xfs 1388544 1 libcrc32c 16384 3 nf_conntrack,xfs,nf_nat i915 1933312 37 rtsx_pci_sdmmc 28672 0 mmc_core 172032 1 rtsx_pci_sdmmc e1000e 282624 0 i2c_algo_bit 16384 1 i915 drm_kms_helper 192512 1 i915 crc32c_intel 24576 1 drm 454656 9 i915,drm_kms_helper ptp 20480 1 e1000e serio_raw 16384 0 rtsx_pci 65536 2 rtsx_pci_sdmmc,rtsx_pci_ms pps_core 20480 1 ptp video 45056 2 thinkpad_acpi,i915