Messages in this thread | | | Date | Wed, 25 Feb 2015 12:16:57 -0600 | From | Mario Limonciello <> | Subject | Re: [SUSPECT SPAM] Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode. |
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On 02/23/2015 06:01 PM, Pali Rohár wrote: > On Tuesday 24 February 2015 00:31:52 Mario Limonciello wrote: > For older dell models (some old inspirions and maybe also > latitude) it was possible to use undocumented DELLDIAG interface > (which enter into SMM mode and call some functions) to enable > that "RAW" mode. > > Now when you are discussing with us, do you have some information > or can you comment (if it is not secret) that DELLDIAG SMM > interface? > > In linux kernel we have for it driver (provides info about > temperature, fan speed, power management, hotkeys, ...), but it > use undocumented interface (and sometimes it has problems): > > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/char/i8k.c I don't have any more information I can share on this interface other than I wouldn't recommend to rely on it. It's generally not supposed to be used by the OS but only for diagnostic purposes from BIOS level diagnostic tools. > Nothing new. It is that problem with repeating keys which is > fixed by last version of BIOS. > > I saw one E6440 model with preinstalled Ubuntu 12.04.2 and > distributed with A08 BIOS (which had that problem). And this was > very very annoying! You could imagine it, you buy new Latitude > (business class pro notebook), you started it and on preinstalled > OS, keyboard is not usable. Updating to A10 fixed it. >
I'm sorry that this had actually made it out the door with a pre-installed machine, but I'm glad we were able to get it fixed in the field.
> In this forum thread people reported that "repeating keys" > problem for more models: http://en.community.dell.com/support-forums/laptop/f/3518/t/19593360?pi239031352=19 Yes, there is a support agent in that thread relaying those models to the BIOS team. > And it looks like (from what I'm reading) last version A10 of > E6440 BIOS broke USB3.0 support. >
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