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[Launchpad Bug Tracker <1048006@xxxxxxxxxxxxxxxxxx>]

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I switched from a VGA cable to an HDMI cable for my external monitor. If
I boot with the HDMI cable plugged-in and connected to the monitor, I
get the USB lag issue below. However, if I plug-in the HDMI cable after
bootup I don't see this problem. Booting with VGA plugged in is fine as
well. Also, booting with the HDMI cable connected to the laptop, but
disconnected from the monitor does not cause the problem.

Monitor Info:
Brand: KDS
Product No: K-2626MDHWB
Model No: 2600W
The monitor has 3.5mm audio jack. I'm guessing it's for input. If I output sound to HDMI the speakers in the monitor play.

The HDMI cable is "High Speed with Ethernet". Monster cable, 140054-00

Laptop: Lenovo ThinkPad Edge
Ubuntu 12.04 64-bit
Linux: 3.2.0-30-generic #48-Ubuntu

This is the problem I see when I boot with the HDMI cable connected to
the monitor:

The USB mouse stutters/lags as I move it and the USB keyboard misses
characters as a type and registers keys slowly. Both seem to have the
same latency, I would estimate it around 250ms. So, moving the mouse
steadily, I only see it's position update every 250ms or so. Typing
quickly on the keyboard results in lost characters.

If I rapidly press a key on the USB keyboard, the keys register slower than on the laptop keyboard.
For example, rapidly repeating a key on the USB keyboard for 10 seconds, I get about 40 characters on the USB keyboard, but the same test with the laptop keyboard results in around 70.

There are some similar bugs regarding the lightdm themes, but my issue seems different.  See 945749 and its duplicates:
https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/945749

My problem occurs in the greeter and the normal gnome desktop. I've
tried Gnome Shell, Unity, Enlightenment 17; all have the issue.

I tried changing themes (recommended by the lightdm bug discussion), no effect.
I also tried disabling polling:
echo N > /sys//module/drm_kms_helper/parameters/poll

Unplugging 2nd monitor.
Replugging both USB devices.

When I plug in the USB keyboard, dmesg reports:
[ 1667.803020] usb 1-1.1: new low-speed USB device number 10 using ehci_hcd
[ 1668.166316] input: Microsoft Natural\xffffffc2\xffffffae\xffffffae Ergonomic Keyboard 4000 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/input/input20
[ 1668.166669] microsoft 0003:045E:00DB.0009: input,hidraw0: USB HID v1.11 Keyboard [Microsoft Natural\xffffffc2\xffffffae\xffffffae Ergonomic Keyboard 4000] on usb-0000:00:1a.0-1.1/input0
[ 1668.242069] input: Microsoft Natural\xffffffc2\xffffffae\xffffffae Ergonomic Keyboard 4000 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.1/input/input21
[ 1668.242337] microsoft 0003:045E:00DB.000A: input,hidraw1: USB HID v1.11 Device [Microsoft Natural\xffffffc2\xffffffae\xffffffae Ergonomic Keyboard 4000] on usb-0000:00:1a.0-1.1/input1

Also, when I boot without the HDMI cable, then plug it in, the dmesg log
shows:

[ 1058.761517] HDMI hot plug event: Codec=3 Pin=4 Presence_Detect=1 ELD_Valid=1
[ 1058.761604] HDMI status: Codec=3 Pin=4 Presence_Detect=1 ELD_Valid=1
[ 1059.060524] HDMI status: Codec=3 Pin=4 Presence_Detect=1 ELD_Valid=1
[ 1059.064070] HDMI: detected monitor  at connection type HDMI
[ 1059.064073] HDMI: available speakers: FL/FR
[ 1059.064078] HDMI: supports coding type LPCM: channels = 2, rates = 32000 44100 48000 96000, bits = 16 20 24

Let me know what logs/tests you want.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: usb
-- 
External USB keyboard and mouse lag (laptop keyboard & touchpad normal) when booting laptop with HDMI cable connected to external monitor.
https://bugs.launchpad.net/bugs/1048006
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