On Tue, 26 Apr 2011 23:29:42 +0200, Jiri Kosina said: > On Tue, 26 Apr 2011, Valdis.Kletnieks@xxxxxx wrote: > > > > > Bus 001 Device 006: ID 0e8f:0020 GreenAsia Inc. USB to PS/2 Adapter > > > > > Have you tried testing the adapter by plugging it in after the system > > > is running? > > > > It works fine at the Grub screen. > > > > It *doesn't* work for the kernel when it initially starts up, even though a few > > seconds ago the hardware worked just fine. > > > > It *does* work after I've unplugged/replugged it - I've tested both the USB > > side and the PS2 side, in either case it starts working. > It seems like the BIOS handover of the USB input device doesn't work > properly. > > The way things usually work in such situations -- BIOS is able to > understand USB input devices in a very basic mode (hidp) and translate the > events into PS/2-looking events, so that things like grub (which don't > understand USB HID) are able to see keyboard events -- BIOS presents those > as PS/2 devices. > > Once kernel is booted, it takes over devices in this 'legacy' mode from > BIOS, and initializes them properly as USB input devices. > > Seems like this process is broken on your system. Could you please try to > disable legacy USB emulation in your BIOS, and see if the problem > persists? (it will make USB keyboard unavailable in grub). Possible datapoint - the USB handoff can't be *totally* broken on the laptop, because it handled another Microsoft Natural keyboard with a USB on it just fine, so it's something specific to the GreenAsia adapter. I disabled legacy USB emulation, and as expected, the keyboard wasn't available to grub. It was *also* unavailable to the initrd until I did the 'disc/reconnect' thing, at which point it started working. (Sorry, don't have the dmesg from that one, can get it tomorrow (Wed) morning if you want. And any advice on additional debugging I can turn on to help would be accepted too).
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