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Re: kern/53444: extended W mode enabling makes vt-switching very slow
The following reply was made to PR kern/53444; it has been noted by GNATS.
From: Valery Ushakov <uwe%stderr.spb.ru@localhost>
Subject: Re: kern/53444: extended W mode enabling makes vt-switching very slow
Date: Fri, 13 Jul 2018 01:27:32 +0300
On Thu, Jul 12, 2018 at 21:20:00 +0000, coypu%sdf.org@localhost wrote:
> uwe mentions this:
> 0xe6, 0xe8, 0x00, 0xe8, 0x00,
> 0xe8, 0x00, 0xe8, 0x03, 0xf3,
> effectively hard-codes the 'psmouse sliced command' which multiple
> things use (and then some).
> In the words of otherOS:
> * psmouse_sliced_command() sends an extended PS/2 command to the mouse
> * using sliced syntax, understood by advanced devices, such as Logitech
> * or Synaptics touchpads. The command is encoded as:
> * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
> The documentation/other drivers use sliced commands.
- E6 makes sure we are in a known state (just in case previous command was E8)
- E8 xx ... sends the argument for the extended command in slices
- F3 xx is the command
FWIW, the docs I have say that F3 C8 sets Deluxe Mode Byte 3 but they
are rather old and that byte is unused/undocumented in them.
I wonder if the device is unhappy b/c you send that extended command
byte by byte instead of using pms_sliced_command() that will send it
in meaningful chunks.
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