On 1/9/06, Alan Stern <[EMAIL PROTECTED]> wrote: > On Mon, 9 Jan 2006, Dmitry Torokhov wrote: > > > > It would be nice to know which part of the usb-handoff code causes the > > > problem. > > > > Well, it's not handoff code causing problems per se, it's just that it > > does not look like it performs handoff. If it did then disabling USB > > legacy emulation in BIOS would have no effect, right? > > On the other hand, if the BIOS worked correctly then the ps/2 port would > have no problems regardless of whether USB legacy emulation was on or off. > Given that the keyboard works during bootup, I see only two possibilities: > > The USB handoff code somehow causes the BIOS to mess up the > state of the 8042; > > The 8042 driver interacts badly with the firmware when USB > legacy emulation is on, and the USB handoff code doesn't > successfully turn off legacy emulation. > > My earlier suggestion was an attempt to test the first possibility. The > second is harder to test because it implies problems in both the 8042 > driver and the USB handoff code. >
My experience is that USB legacy emulation in BIOS + ACPI works as long as you do not touch it and gets terribly confused if someone tries to actually use i8042 (like enable active multiplexing mode with 4 AUX ports). As soon as BIOS takes its dirty hands off i8042 everything works fine. The problem it seems that when usb-handoff code was moved from pci quirks and enabled inconditionally something happened so it stopped doing handoff. -- Dmitry ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_idv37&alloc_id865&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
