On Wed, Apr 8, 2015 at 2:29 PM, Peter Hurley <[email protected]> wrote: > Hi Andy, > > On 04/08/2015 05:17 PM, Andy Lutomirski wrote: >> Something strange seems to have happened to my serial console setup. >> I boot with console=ttyS1,115200n8 and I have a getty running on >> /dev/ttyS1. >> >> On older kernels, or if I remove the console= boot parameter, then my >> getty works fine. On 3.19.3 with the console= parameter, something's >> wrong with termios and I can't log in. Running: > > Thanks for the report. > 1. Please attach your dmesg. > 2. Is this behavior new to 3.19.3? (iow, what was the last version > that you noticed didn't do this)
I didn't have the problem before I reinstalled this box, upgraded from
3.15 to 3.19.3, and updated by Dell iDRAC7 firmware. Booting into
3.13-something does *not* fix the problem, so I'm not at all convinced
that the kernel version matters much. I'll try reverting the iDRAC7
thing, but I don't see why that would make any difference at all to
Linux.
dmesg attached. I don't even know what to look for there, though.
>
> Regards,
> Peter Hurley
>
>> # stty icanon </dev/ttyS1
>>
>> breaks line this (partial strace results included):
>>
>> ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
>> TCGETS, {B115200 opost -isig -icanon -echo ...}) = 0
>> ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
>> TCGETS, {B115200 opost -isig -icanon -echo ...}) = 0
>> ioctl(0, SNDCTL_TMR_STOP or SNDRV_TIMER_IOCTL_GINFO or TCSETSW,
>> {B115200 opost -isig icanon -echo ...}) = 0
>> ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
>> TCGETS, {B115200 opost -isig -icanon -echo ...}) = 0
>> ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
>> TCGETS, {B115200 opost -isig -icanon -echo ...}) = 0
>> write(2, "stty: ", 6stty: ) = 6
>> write(2, "standard input: unable to perfor"..., 58standard input:
>> unable to perform all requested operations) = 58
>>
>> IOW, the setting didn't stick. On the bad kernel, stty works just
>> fine on ttyS0. If I switch to using console=ttyS0,115200, then stty
>> works on ttyS1 and fails on ttyS0.
>>
>> I have no idea what's going on here. I have two apparently identical
>> boxes. One of them has this problem and the other doesn't.
>
--
Andy Lutomirski
AMA Capital Management, LLC
dmesg.txt.xz
Description: application/xz
