Bug 189094 - kernel-2.6.16-1.2069_FC4 breaks serial port registration (non-win modem)
Summary: kernel-2.6.16-1.2069_FC4 breaks serial port registration (non-win modem)
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
(Show other bugs)
Version: 4
Hardware: athlon Linux
Target Milestone: ---
Assignee: Dave Jones
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2006-04-16 01:20 UTC by Christopher Johnson
Modified: 2015-01-04 22:26 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-07-29 05:53:00 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Christopher Johnson 2006-04-16 01:20:22 UTC
Description of problem:

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.Upgrade kernel to 2.6.16-1.2069_FC4
3.Kernel is unable to register serial port for modem
Actual results:
Apr 15 18:37:00 freedom kernel: Couldn't register serial port 0000:00:0a.0: -28

Expected results:
Apr 15 20:38:14 freedom kernel: ttyS14 at I/O 0xc000 (irq = 5) is a 16550A

Additional info:

lspci -v -s 00:0a.0
00:0a.0 Communication controller: Agere Systems Venus Modem (V90, 56KFlex)
        Subsystem: Actiontec Electronics Inc: Unknown device 0480
        Flags: bus master, medium devsel, latency 0, IRQ 5
        Memory at ef001000 (32-bit, non-prefetchable) [size=256]
        I/O ports at c000 [size=256]
        I/O ports at c400 [size=256]
        I/O ports at c800 [size=8]

        Capabilities: [f8] Power Management version 2

By reverting to kernel-2.6.14-1.1653_FC4 the modem's serial port is registered.

Comment 1 Dave Jones 2006-05-29 03:57:47 UTC
how many serial ports do you have ?
If you boot with 8250.nr_uarts=8 (or however many), does it start working again?

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