On Saturday 11 April 2015 01:07:03 Mario Limonciello wrote: > On 04/10/2015 05:39 PM, Pali Rohár wrote: > > On Wednesday 25 February 2015 21:45:22 Pali Rohár wrote: > > Hello Mario, > > have you patched synaptics driver with some resetafter > > parameter? And have some team in dell found reason for > > invalid packets? > > Hi Pali, > > The reason was found for the invalid packets in PS2 mode, but > I can't go into the details about it publicly. > > I think it's better to not bother including my proposed > solution, however. The vector of users in PS2 mode should be > very small now. Here's why: > With no kernel command line options applied the touchpad will > run in I2C mode with the current kernel. The only reason > that users were being exposed to the PS2 mode was if they ran > with the kernel command line option acpi_osi="!Windows 2013". > This was required with BIOS A01 due to the problem with I2S > audio. This I2S audio problem has been resolved for BIOS A02 > and BIOS A03. With no options applied on the kernel command > line the system will run in I2C touchpad and HDA audio. All > new machines will be coming with A03 or later. Users with > earlier versions have been advised to upgrade to fix this > among other issues. > > The HDA audio will work correctly for output with 4.0. It > will work properly for input when these two patches are > applied (which will land in 4.1) > > https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/c > ommit/?h=for-next&id=e1e62b98ebddc3234f3259019d3236f66fc667f8 > > and > > https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/c > ommit/?h=for-next&id=f3b703326541d0c1ce85f5e570f6d2b6bd4296ec > > > If the patch to disambiguate the value of _REV() lands in 4.1 > the audio will begin to operate fully in I2S mode and the > necessary support will be included in 4.1 as well. > > So with all those factors I feel that it's a very low risk > that users will end up in PS2 mode with the current > development focus kernels. > > Thanks, I could see problem with using older kernels which are in more stable or LTS distribution versions... But it is nice that problems are fixes for future 4.0/4.1 versions. And if you located reason for invalid packets in PS/2 mode, will you fix it in some new bios versions? Can you comment if this is also same problem with invalid packets on E6440/E7440 machines? -- Pali Rohár pali.rohar@xxxxxxxxx
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