Comment 12 for bug 670181

Just to add a new data point:

I noticed today that I had a bunch of kernels from 10.04 lying around my /boot. Since it worked perfectly the very day I upgraded (several weeks ago), I thought maybe going back to an earlier kernel version would do it. So I added the last 10.04 kernel to grub, booted, and it still doesn't work.

The kernel version I booted was this one: 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010

Is it possible this is actually a bug in the userspace tools -- udev, or udev rules?

Found the following in my /var/log/kernel.log (under 2.6.32-25):
Dec 6 21:48:37 silas kernel: [ 95.709963] mmc0: Got command interrupt 0x00030000 even though no command operation was in progress.
Dec 6 21:48:37 silas kernel: [ 95.709966] sdhci: ============== REGISTER DUMP ==============
Dec 6 21:48:37 silas kernel: [ 95.709971] sdhci: Sys addr: 0x00000000 | Version: 0x00000200
Dec 6 21:48:37 silas kernel: [ 95.709975] sdhci: Blk size: 0x00000000 | Blk cnt: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.709980] sdhci: Argument: 0x00000000 | Trn mode: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.709984] sdhci: Present: 0x01ff0000 | Host ctl: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.709989] sdhci: Power: 0x0000000f | Blk gap: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.709994] sdhci: Wake-up: 0x00000000 | Clock: 0x00004007
Dec 6 21:48:37 silas kernel: [ 95.709999] sdhci: Timeout: 0x0000000e | Int stat: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.710003] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00ff00c3
Dec 6 21:48:37 silas kernel: [ 95.710008] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
Dec 6 21:48:37 silas kernel: [ 95.710012] sdhci: Caps: 0x01e021a1 | Max curr: 0x00000040
Dec 6 21:48:37 silas kernel: [ 95.710014] sdhci: ===========================================