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[Kimmo Huoman <kipenroskaposti@xxxxxxxxx>]

Just tested with completely new system in VirtualBox, first installed 9.04 (the install what my system is updated from originally) and updated to 10.04 and then to 10.10.
It seems like the new kernel in 10.10 indeed causes the problem by using modules in kernel itself as opposed to modules before. Both, the module "lirc_mceusb" and plain "mceusb" show up on "lsmod | grep mceusb", so it seems like it loads both the old and new modules. The same thing happens with "lirc-modules-source" installed and removed.

-- 
/dev/lirc0 disappeared after upgrade from 2.6.35-20 to -22
https://bugs.launchpad.net/bugs/655512
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Status in “lirc” package in Ubuntu: New
Status in “lirc” source package in Maverick: Confirmed

Bug description:
Binary package hint: lirc

Using kernel 2.6.35-20 works fine - there is  /dev/lirc0 entry.  Recent upgrade to 2.6.35-22 caused /dev/lirc0 to disappear.  Rebooting with 2.6.35-20 brings it back.

== Regression details ==
Discovered in version: Linux 2.6.35-22
Last known good version: Linux 2.6.35-20

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: lirc 0.8.7~pre3-0ubuntu1 [modified: usr/share/lirc/extras/transmitter.hwdb]
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Uname: Linux 2.6.35-20-generic i686
Architecture: i386
Date: Tue Oct  5 23:36:42 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100910)
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/bash
SourcePackage: lirc
---
.etc.asound.conf:
 pcm.!default{
 type hw
 card 1
 device 3
 }
AcpiTables: Error: command ['gksu', '-D', 'Apport', '--', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 1:
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  todd       1810 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
   Mixer name	: 'Realtek ALC889A'
   Components	: 'HDA:10ec0885,1458a002,00100101'
   Controls      : 41
   Simple ctrls  : 23
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfdffc000 irq 19'
   Mixer name	: 'ATI RS690/780 HDMI'
   Components	: 'HDA:1002791a,00791a00,00100000'
   Controls      : 4
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
DistroRelease: Ubuntu 10.10
HibernationDevice: RESUME=UUID=2a89ff2c-7da4-457a-ac27-8747ff6acc88
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100910)
IwConfig:
 lo        no wireless extensions.

 eth0      no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. GA-MA78GM-US2H
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-20-generic root=UUID=8398ea79-91c0-4b7d-b700-ff318f98cc57 ro acpi=off
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Regression: Yes
RelatedPackageVersions: linux-firmware 1.38
Reproducible: Yes
RfKill:

Tags: maverick kernel-config regression-potential needs-upstream-testing
Uname: Linux 2.6.35-20-generic i686
UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare
WifiSyslog: Oct  7 20:10:55 todd-desktop kernel: [162304.465564] mythfrontend.re[17616]: segfault at 33eee05f ip 0888540c sp bfdefdc8 error 6
dmi.bios.date: 12/15/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: GA-MA78GM-US2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd12/15/2008:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA78GM-US2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA78GM-US2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA78GM-US2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

---
.etc.asound.conf:
 pcm.!default{
 type hw
 card 1
 device 3
 }
AcpiTables:
 Error: command ['gksu', '-D', 'Apport', '--', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 1: Traceback (most recent call last):  File "/usr/share/apport/dump_acpi_tables.py", line 52, in <module>
     dump_acpi_tables('/sys/firmware/acpi/tables', sys.stdout)
   File "/usr/share/apport/dump_acpi_tables.py", line 43, in dump_acpi_tables
     tables = os.listdir(path)
 OSError: [Errno 2] No such file or directory: '/sys/firmware/acpi/tables'
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  todd       1759 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfe024000 irq 16'
   Mixer name	: 'Realtek ALC889A'
   Components	: 'HDA:10ec0885,1458a002,00100101'
   Controls      : 41
   Simple ctrls  : 23
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfdffc000 irq 19'
   Mixer name	: 'ATI RS690/780 HDMI'
   Components	: 'HDA:1002791a,00791a00,00100000'
   Controls      : 4
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
DistroRelease: Ubuntu 10.10
HibernationDevice: RESUME=UUID=2a89ff2c-7da4-457a-ac27-8747ff6acc88
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100910)
IwConfig:
 lo        no wireless extensions.

 eth0      no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. GA-MA78GM-US2H
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=8398ea79-91c0-4b7d-b700-ff318f98cc57 ro acpi=off
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Regression: Yes
RelatedPackageVersions: linux-firmware 1.38
Reproducible: Yes
RfKill:

Tags: maverick kernel-config regression-potential needs-upstream-testing
Uname: Linux 2.6.35-22-generic i686
UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare
dmi.bios.date: 12/15/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: GA-MA78GM-US2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd12/15/2008:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA78GM-US2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA78GM-US2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA78GM-US2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.