L.S. up to vanilla kernel-4.6.2 sound was working fine. Switching to kernel-4.7.0-rc3 made sound disappear. No /dev/mixer etc. There appears to be a bug in the Intel sound driver and/or ACPI driver. Dmesg shows interesting lines like: [ 11.498592] ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 7 [ 11.498605] PCI: setting IRQ 7 as level-triggered [ 11.543903] parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,EPP] [ 12.757735] genirq: Flags mismatch irq 7. 00000080 (snd_intel8x0m) vs. 00000000 (parport0) [ 12.757751] snd_intel8x0m 0000:00:1f.6: unable to grab IRQ 7 [ 12.757875] snd_intel8x0m: probe of 0000:00:1f.6 failed with error -16 [ 12.900171] genirq: Flags mismatch irq 7. 00000080 (snd_intel8x0) vs. 00000000 (parport0) [ 12.900189] snd_intel8x0 0000:00:1f.5: unable to grab IRQ 7 [ 12.900389] snd_intel8x0: probe of 0000:00:1f.5 failed with error -16 [ 12.922554] genirq: Flags mismatch irq 7. 00000080 (ipw2200) vs. 00000000 (parport0) [ 12.922559] ipw2200: Error allocating IRQ 7
If I boot kernel-4.7.0-rc3 with acpi=off then sound is back! If you need the full dmesg outputs then please get them here: http://webserver.djo.tudelft.nl/dmesg460+ACPI http://webserver.djo.tudelft.nl/dmesg473+ACPI http://webserver.djo.tudelft.nl/dmesg473noACPI (with excuses for the silly hostname which is out of our control) Regards, Wim. ----- w...@djo.tudelft.nl -----
