Comment 18 for bug 759986

following last post and past experience with 11.04 boot I decided to take another look at various logs because

- on 10/15 (+ or-) successful boots ONE is UNSUCCESSFUL (no mssgs whatsoever) AFTER prompted and entering the log in info. the info is accepted the screen turns to pink colour and the pc locks hard at this screen; there is no hd activity noticed; the pc must be powered down and up again and a successful boot can be obtained. there are no messages whatsoever after gdm successful boot.

looking at dmesg I noticed

[ 50.692374] hda-intel: IRQ timing workaround is activated for card #2. Suggest a bigger bdl_pos_adj.

also pls take a look at

[ 98.059446] xhci_hcd 0000:02:00.0: WARN: Stalled endpoint

and following; quite a few iterations on this loop. basically sdf is an external hd device connected to an usb3 adapter card id as follows

02:00.0 USB Controller [0c03]: NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] (rev 03) (prog-if 30 [XHCI])
 Flags: bus master, fast devsel, latency 0, IRQ 16
 Memory at fddfe000 (64-bit, non-prefetchable) [size=8K]
 Capabilities: <access denied>
 Kernel driver in use: xhci_hcd
 Kernel modules: xhci-hcd

dmesg and kern.log attached. the kernel in use is the one with Seth's patch applied (see above) ; just an opinion - maybe this usb3 controller-hd combo authentication and config is the cause of the odd unsuccessful boots ?