Thread: Unwanted module loads automatically at boot !

ubuntu 12.04 lts , 3.5.0-23-generic kernel, x86_64

have been developing modules system, , reason 1 of them re-loads automatically @ boot-time.

symptoms :

1) modprobe mesa_5i23 # that's module
2) shutdown -h 0
3) (power off)
4) (power on)
5) lsmod | grep mesa_5i23 # yes there !

module *not* listed in /etc/modules.

i've been coding kernel modules many years, , understanding should *not* happen ! what's going on ?

possible contributing factors :

module installs pci driver (a first me)
i'm brand new ubuntu.

dmesg after reboot shows following. (the bold part produced module)

code:

[    2.634910] [drm] supports vblank timestamp caching rev 1 (10.10.2010).[    2.634916] [drm] driver supports precise vblank timestamp query. [    2.666967] vgaarb: device changed decodes: pci:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem [    2.674737] usbcore: registered new interface driver usbhid [    2.674747] usbhid: usb hid core driver [    2.681249] type=1400 audit(1362945120.877:2): apparmor="status" operation="profile_load" name="/sbin/dhclient" pid=382 comm="appa\ rmor_parser" [    2.682910] type=1400 audit(1362945120.877:3): apparmor="status" operation="profile_load" name="/usr/lib/networkmanager/nm-dhcp-cl\ ient.action" pid=382 comm="apparmor_parser" [    2.683868] type=1400 audit(1362945120.877:4): apparmor="status" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-\ script" pid=382 comm="apparmor_parser" [    2.716152] usb 5-2: new full-speed usb device number 2 using uhci_hcd [    2.724929] [drm] gmbus [i915 gmbus panel] timed out, falling bit banging on pin 3 [    2.740864] i915: fixme: max pwm 0 [    2.741652] lp0: using parport0 (interrupt-driven).  [    2.745952] mesa i/o driver installed [    2.746018] mesa_5i23 0000:05:00.0: enabling device (0010 -> 0013) [    2.746088] error: invalid fpga config id : 0x00000104 [    2.746102] mesa 5i23 not probed [    2.746116] mesa_5i23: probe of 0000:05:00.0 failed error -5  [    2.752328] [drm] initialized overlay support [    2.826338] microcode: cpu0 sig=0x106ca, pf=0x8, revision=0x107 [    2.899639] usb 5-2: new usb device found, idvendor=046d, idproduct=c52b [    2.899652] usb 5-2: new usb device strings: mfr=1, product=2, serialnumber=0 [    2.899660] usb 5-2: product: usb receiver [    2.899667] usb 5-2: manufacturer: logitech [    3.019272] fbcon: inteldrmfb (fb0) primary device [    3.021266] console: switching colour frame buffer device 160x50 [    3.021359] fb0: inteldrmfb frame buffer device [    3.021366] drm: registered panic notifier [    3.021406] i915: no acpi video bus found [    3.021653] [drm] initialized i915 1.6.0 20080730 0000:00:02.0 on minor 0 [    3.022501] acpi warning: 0x0000000000000460-0x000000000000047f systemio conflicts region \_sb_.pci0.gfx0.tcoi 1 (20120320/ut\ address-251) [    3.022526] acpi: if acpi driver available device, should use instead of native driver [    3.022533] lpc_ich: resource conflict(s) found affecting itco_wdt [    3.022543] acpi warning: 0x0000000000000428-0x000000000000042f systemio conflicts region \gpe0 1 (20120320/utaddress-251)

as far installation, copy module :

/lib/modules-3.5.0-23-generic/extras/

add dir depmod search path ( add file : depmod.d/extra.conf) , run depmod.

set modprobe rules in /etc/modprobe.d/mesa.conf ( install mesa_5i23 ...)



note module loads correctly when run modprobe mesa_5i23 command line. (unwanted !) auto-load @ boot time fails; indicates me being loaded insmod command , not modprobe : modprobe rules being ignored.

okay, got figured out.

module being loaded hotplug mechanism.

because module registers pci driver, when depmod runs keeps record of in /lib/modules/xxx/modules.alias . anytime system detects new (unknown) hardware, udev daemon checks file find module provides driver.

suppose thing, sure nuisance when *not* behavior want/expect.

perhaps of kernel module programming documentation out there stand corrected :

1) if want module load @ boot-time, list in /etc/modules or register driver.

2) function pci_register_driver() tells system ready handle particular device, system knows before code executed.

sorry sounding grumpy. it's i'm feeling pretty grumpy. have nice day.

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