Serial port only recognized with acpi=off boot flag











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I have a computer with a skylake motherboard (ASRock IMB-195), and I'm trying to use the on-board serial port (/dev/ttyS0). I'm using Ubuntu Server with Linux Kernel 4.4.0-72.



If I boot with acpi=off, I get the following output (dmesg):



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled

serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS2 at I/O 0x3e8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS3 at I/O 0x2e8 (irq = 3, base_baud = 115200) is a 16550A


with acpi on:



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled


Completely disabling ACPI is very suboptimal (can't reboot without manually power cycling for example).



Is there a way to disable the parts of ACPI that are preventing the serial driver from working?






ubuntu serial-port acpi







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  • First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
    – dirkt
    Nov 27 at 7:39















up vote
1
down vote

favorite












I have a computer with a skylake motherboard (ASRock IMB-195), and I'm trying to use the on-board serial port (/dev/ttyS0). I'm using Ubuntu Server with Linux Kernel 4.4.0-72.



If I boot with acpi=off, I get the following output (dmesg):



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled

serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS2 at I/O 0x3e8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS3 at I/O 0x2e8 (irq = 3, base_baud = 115200) is a 16550A


with acpi on:



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled


Completely disabling ACPI is very suboptimal (can't reboot without manually power cycling for example).



Is there a way to disable the parts of ACPI that are preventing the serial driver from working?






ubuntu serial-port acpi







share|improve this question






















  • First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
    – dirkt
    Nov 27 at 7:39













up vote
1
down vote

favorite









up vote
1
down vote

favorite











I have a computer with a skylake motherboard (ASRock IMB-195), and I'm trying to use the on-board serial port (/dev/ttyS0). I'm using Ubuntu Server with Linux Kernel 4.4.0-72.



If I boot with acpi=off, I get the following output (dmesg):



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled

serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS2 at I/O 0x3e8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS3 at I/O 0x2e8 (irq = 3, base_baud = 115200) is a 16550A


with acpi on:



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled


Completely disabling ACPI is very suboptimal (can't reboot without manually power cycling for example).



Is there a way to disable the parts of ACPI that are preventing the serial driver from working?






ubuntu serial-port acpi







share|improve this question













I have a computer with a skylake motherboard (ASRock IMB-195), and I'm trying to use the on-board serial port (/dev/ttyS0). I'm using Ubuntu Server with Linux Kernel 4.4.0-72.



If I boot with acpi=off, I get the following output (dmesg):



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled

serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A

serial8250: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS2 at I/O 0x3e8 (irq = 3, base_baud = 115200) is a 16550A

serial8250: ttyS3 at I/O 0x2e8 (irq = 3, base_baud = 115200) is a 16550A


with acpi on:



Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled


Completely disabling ACPI is very suboptimal (can't reboot without manually power cycling for example).



Is there a way to disable the parts of ACPI that are preventing the serial driver from working?






ubuntu serial-port acpi




ubuntu serial-port acpi






share|improve this question













share|improve this question











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asked Apr 20 '17 at 13:47









Magneon

62




62












  • First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
    – dirkt
    Nov 27 at 7:39


















  • First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
    – dirkt
    Nov 27 at 7:39
















First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
– dirkt
Nov 27 at 7:39




First step would be to compare dmesg after boot with and without acpi=off, and see what goes wrong. There are also tools to decode the ACPI tables (but the ACPI spec is difficult, this isn't fun).
– dirkt
Nov 27 at 7:39










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You can try "acpi=noirq" instead. That's the only way I can get my ttyS0 to work with Serial-Over-Lan on an Intel AMT platform. It doesn't seem to have any ill effects but if anyone else knows a better solution, please share.






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    You can try "acpi=noirq" instead. That's the only way I can get my ttyS0 to work with Serial-Over-Lan on an Intel AMT platform. It doesn't seem to have any ill effects but if anyone else knows a better solution, please share.






    share|improve this answer








    New contributor




    Neal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      up vote
      2
      down vote













      You can try "acpi=noirq" instead. That's the only way I can get my ttyS0 to work with Serial-Over-Lan on an Intel AMT platform. It doesn't seem to have any ill effects but if anyone else knows a better solution, please share.






      share|improve this answer








      New contributor




      Neal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.




















        up vote
        2
        down vote










        up vote
        2
        down vote









        You can try "acpi=noirq" instead. That's the only way I can get my ttyS0 to work with Serial-Over-Lan on an Intel AMT platform. It doesn't seem to have any ill effects but if anyone else knows a better solution, please share.






        share|improve this answer








        New contributor




        Neal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.









        You can try "acpi=noirq" instead. That's the only way I can get my ttyS0 to work with Serial-Over-Lan on an Intel AMT platform. It doesn't seem to have any ill effects but if anyone else knows a better solution, please share.







        share|improve this answer








        New contributor




        Neal is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.









        share|improve this answer



        share|improve this answer






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        answered Nov 27 at 2:36









        Neal

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