> -----Original Message----- > From: Pali Rohár [mailto:pali.rohar@xxxxxxxxx] > Sent: Monday, May 7, 2018 3:28 PM > To: Limonciello, Mario > Cc: dmitry.torokhov@xxxxxxxxx; linux-input@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx > Subject: Re: Dell docking station & Dell Embedded Controller & PS/2 devices > > On Monday 07 May 2018 20:18:30 Mario.Limonciello@xxxxxxxx wrote: > > > > > So I guess you could write a platform driver that would install i8042 > > > > > filter on Dell laptops/portables, monitor keyboard data stream and kick > > > > > of rescans on serio ports. The problem is filter gets "serio" so you do > > > > > not really know whether ACK is spurious or not. And I would really > > > > > prefer keeping this crap out of atkbd proper... And all of this is racy > > > > > as hell. What happens if we get keyboard reconnected as we reinitialize > > > > > it? > > > > > > > > If it's done as a platform driver I would suspect it's possible to tell whether > > > > a dock is connected to at least give you some heuristic here to have a better > > > > guess whether it's spurious. > > > > > > Apparently checking for docking station is not enough. There are also > > > Dell Legacy Extenders (or how it is called) which exports internal PS/2, > > > Parallel and Serial Ports. It is also connecting to bottom of laptop. > > > But currently I do not have them for testing. > > > > > > > Pali on your system that supports this dock, check and see how many > > > > System Enclosure SMBIOS tables (structure type 03) are present. > > > > > > Do you mean DMI type 3 structure? Here is something from dmidecode: > > > > > > Handle 0x0003, DMI type 3, 22 bytes > > > Chassis Information > > > Manufacturer: Dell Inc. > > > Type: Laptop > > > Lock: Not Present > > > Version: Not Specified > > > Serial Number: --REMOVED-- > > > Asset Tag: Not Specified > > > Boot-up State: Safe > > > Power Supply State: Safe > > > Thermal State: Safe > > > Security Status: None > > > OEM Information: 0x00000000 > > > Height: Unspecified > > > Number Of Power Cords: 1 > > > Contained Elements: 0 > > > SKU Number: To be filled by O.E.M. > > > > > > But probably you mean something different? > > > > Plug in your dock before you boot up and see if you have a second structure like > > that type produced. > > I already started docked laptop via dock power button. And in dmidecode > output is only one DMI type 3 block. > > > If not, then I guess this isn't a reliable way to find the dock > > on that system and I'll have to see if there is another. > > Seems not. Also detection of dock should work also when you connect > laptop at system runtime, not only when connected prior to booting. > The items that show up in this structure are supposed to be dynamic values but static addresses. I was asking to check before bootup in case this was a problem of Linux caching SMBIOS table information once. The values I was referring to might be for older generation dock though, I'll see if I can find anything else you can check. ��.n��������+%������w��{.n�����{��)��^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
