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Message #58505
[Bug 1313981] Re: Kernel disabling serial port ttyS0 on boot
** Description changed:
On boot in 13.10 kern.log would state:
- Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
- 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
+ Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
+ 00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
and my serial modem would work just fine.
After upgrading to 14.04 the kernel log contains:
- Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
- serial 00:0a: disabled
+ Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
+ serial 00:0a: disabled
+
+ [[ Note that with the 3.13.0-24 kernel as reported in the bug below we see this:
+ [ 3.191190] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
+ [ 3.191342] serial 00:0a: disabled
+ ]]
How do I enable 00:0a? Do I need to recompile the kernel with a different config?
- ---
+ ---
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC0: ubuntu-gnome 2581 F.... pulseaudio
- /dev/snd/controlC1: ubuntu-gnome 2581 F.... pulseaudio
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: ubuntu-gnome 2581 F.... pulseaudio
+ /dev/snd/controlC1: ubuntu-gnome 2581 F.... pulseaudio
CasperVersion: 1.340
CurrentDesktop: GNOME
DistroRelease: Ubuntu 14.04
LiveMediaBuild: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
MachineType: System manufacturer System Product Name
Package: linux (not installed)
ProcEnviron:
- TERM=xterm
- PATH=(custom, no user)
- XDG_RUNTIME_DIR=<set>
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ TERM=xterm
+ PATH=(custom, no user)
+ XDG_RUNTIME_DIR=<set>
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash live-media=/dev/sdd1 --
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
RelatedPackageVersions:
- linux-restricted-modules-3.13.0-24-generic N/A
- linux-backports-modules-3.13.0-24-generic N/A
- linux-firmware 1.127
+ linux-restricted-modules-3.13.0-24-generic N/A
+ linux-backports-modules-3.13.0-24-generic N/A
+ linux-firmware 1.127
RfKill:
- 0: phy0: Wireless LAN
- Soft blocked: no
- Hard blocked: no
+ 0: phy0: Wireless LAN
+ Soft blocked: no
+ Hard blocked: no
Tags: trusty
Uname: Linux 3.13.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/13/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2104
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z77-V
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
--
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https://bugs.launchpad.net/bugs/1313981
Title:
Kernel disabling serial port ttyS0 on boot
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
On boot in 13.10 kern.log would state:
Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
00:0a: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
and my serial modem would work just fine.
After upgrading to 14.04 the kernel log contains:
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
serial 00:0a: disabled
[[ Note that with the 3.13.0-24 kernel as reported in the bug below we see this:
[ 3.191190] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
[ 3.191342] serial 00:0a: disabled
]]
How do I enable 00:0a? Do I need to recompile the kernel with a different config?
---
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu-gnome 2581 F.... pulseaudio
/dev/snd/controlC1: ubuntu-gnome 2581 F.... pulseaudio
CasperVersion: 1.340
CurrentDesktop: GNOME
DistroRelease: Ubuntu 14.04
LiveMediaBuild: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
MachineType: System manufacturer System Product Name
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/username.seed boot=casper quiet splash live-media=/dev/sdd1 --
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: trusty
Uname: Linux 3.13.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/13/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2104
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8Z77-V
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2104:bd08/13/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8Z77-V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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