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
asked Apr 20 '17 at 13:47
Magneon
62
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up vote
1
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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
asked Apr 20 '17 at 13:47
Magneon
62
First step would be to comparedmesgafter boot with and withoutacpi=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
add a comment |
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
asked Apr 20 '17 at 13:47
Magneon
62
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
asked Apr 20 '17 at 13:47
Magneon
62
asked Apr 20 '17 at 13:47
Magneon
62
asked Apr 20 '17 at 13:47
Magneon
62
asked Apr 20 '17 at 13:47
Magneon
62
asked Apr 20 '17 at 13:47
Magneon
62
62
First step would be to comparedmesgafter boot with and withoutacpi=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
add a comment |
First step would be to comparedmesgafter boot with and withoutacpi=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
add a comment |
1 Answer
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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.
answered Nov 27 at 2:36
Neal
212
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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.
answered Nov 27 at 2:36
Neal
212
add a comment |
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.
answered Nov 27 at 2:36
Neal
212
add a comment |
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.
answered Nov 27 at 2:36
Neal
212
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.
answered Nov 27 at 2:36
Neal
212
answered Nov 27 at 2:36
Neal
212
answered Nov 27 at 2:36
Neal
212
answered Nov 27 at 2:36
Neal
212
212
add a comment |
add a comment |
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First step would be to compare
dmesgafter boot with and withoutacpi=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