On Thu, Nov 22, 2007 at 03:20:11PM +0100, Thomas Renninger wrote: > Hi Henrique, > > - Latest Lenovo ThinkPads do not like ACPI EC writes for brightness > switching (s2ram broken) > > I've been told it only happens when brightness is set above 7. > Don't know, but it seems to be the EC writes > 7 that lets the > machine not wake up anymore from a s2ram. Define "latest Lenovo Thinkpads". I have a X61s that doesn't seem to have this problem. Of course, according to www.lesswatts.org, apparently the BIOS is just making pixels darker, and *not turning down the backlight*, so it's not clear we want to be using this interface anyway... (xbacklight is what we should be using). > - Weird USB - EHCI IRQ problems on very latest Lenovo models > > Unhandled IRQ messages. Looks like an IRQ (from camera?) gets routed > to EHCI pin also? Don't know the details and I am also not very > familar with this..., Oliver might be able to point you to bug > reports, AFAIK there also exist kernel.org bugs. > This is not solved yet, AFAIK. > If anyone knows more about this problem, that would be great... It sounds like this problem: http://bugzilla.kernel.org/show_bug.cgi?id=8853 It seems to be related to the bluetooth driver. See especially comment #61 by Ben Herrenschmidt. It mirrors what I am seeing on the X61s almost exactly. Fortunately the problem seems to be one that can be worked around by unloading and reloading the ehci_hcd and uhci_hcd modules. > Attaching an USB device breaks USB and throws a calltrace > https://bugzilla.novell.com/show_bug.cgi?id=325601 .... and it looks like the end of the Novell bugzilla also points the finger at interrupt routing and bluetooth. (Although interestingly, I don't recall seeing a problem that would actually break the USB on T60's; I'll have to check my old laptop and see if I see any evidence of it.) This smells very much like a ACPI DSDT bug; if Novell has access to Lenovo engineers, I'd suggest seeking them out and reporting this as a hardware bug. (And if you could send updates to the kernel bugzilla and/or Linux thinkpad list, I think we would all be grateful!) - Ted ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
