Hello folks
I have been happily using an ATEN KVM switch (model CS-1742) for
about a year with no discernable problems, dual-booting Fedora Core 5
and Windows 2000 on one port, and my Mac on the other.
I upgraded to a recent Fedora kernel (2.6.17-1.2187_FC5) via 'yum -
upgrade' recently. This exposed an issue I'd been blithely unaware of
on the previous kernel I'd used (2.6.16-1.2122_FC5). With the
previous kernel, mouse and keyboard appear to work fine, but detailed
logs shows lots that looks wrong to my eyes.
With the 2.6.17 kernel, the issues seem to have passed some threshold
and the keyboard is unusable via the KVM, though the mouse seems to
work still.
I have usbmon logs from both 2.6.16 and 2.6.17, and dmesg output with
verbose logging that shows plenty of:
usb 1-3.1: new device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-3.1: Product: CS-1742 V1.0.091
usb 1-3.1: Manufacturer: ATEN Advance Tech Inc.
usb 1-3.1: uevent
usb 1-3.1: configuration #1 chosen from 1 choice
usb 1-3.1: adding 1-3.1:1.0 (config #1, interface 0)
ohci_hcd 0000:00:02.0: urb df585540 path 3.1 ep0out 5f120000 cc 5 -->
status -110
usb 1-3.1: failed to restore interface 0 altsetting 0 (error=-110)
ohci_hcd 0000:00:02.0: urb df585ec0 path 3.1 ep1in 5e160000 cc 5 -->
status -110
usbhid 1-3.1:1.0: retrying intr urb
Plea for help:
--------------
Below are my ramblings on what I've already read and tried - can
anyone point me to a step I've missed or a new route to investigate,
or am I facing the door marked 'You lose - ATEN devices are
unsupportable'?
Please let me know if this belongs on linux-usb-devel, but most lists
prefer you not to bother the developers in the first instance!
Reducing the problem space:
---------------------------
Direct connecting the keyboard, all is well, disconnectin mouse and
keyboard from the KVM still shows errors, so I'm convinced it's the KVM.
Boot single user with minimum extra hardware attached, no change.
I have gathered lsusb --verbose output if that will help, but that's
too big to post here (it's from the 2.6.16 kernel as things are more
stable there).
The short version is as follows (nothing plugged in after the KVM):
Bus 002 Device 003: ID 1267:0103 Logic3 / SpectraVideo plc
(Keyboard plugged into mini-hub so I can use the system from console
in single user)
Bus 002 Device 002: ID 058f:9254 Alcor Micro Corp. Hub
(Mini-hub - I could remove both of the above and ssh onto the box at
RL3 I suppose)
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 033: ID 0557:2233 ATEN International Co., Ltd
(ATEN emulated keyboard port)
Bus 001 Device 011: ID 0557:7000 ATEN International Co., Ltd
(ATEN emulated mouse port)
Bus 001 Device 001: ID 0000:0000
Look for other similar issues:
------------------------------
Searched using Google, linux-usb-users and linux-usb-devel. Found
previous fixes for quirks in KVMs
http://marc.theaimsgroup.com/?l=linux-usb-users&m=109366313709692&w=2
(Possible timeout issue, but I didn't find the instructions on what
to tweak)
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=115196025424954&w=2
(VERY strong echoes, but the thread ended in the user removing the KVM)
Upgrade the problem away:
-----------------------
I looked for any new firmware on the ATEN site, but can't see
anything for the CS-1742 directly. I know it's related to other
devices but there's nothing for the CS-1744 either and I didn't want
to try the CS-1762 version 'just in case'.
There were no more recent kernels directly from Fedora, and I
couldn't see any relevant check-ins on the linus-usb-devel list, so
decided not to try a vanilla kernel.org build. Should I have?
Roll my own patches:
--------------------
I hoped that the fixes in hid-core.c for other ATEN devices might
work, so I patched a custom 2.6.17-1.2187 kernel as follows:
[EMAIL PROTECTED] usb]# cat ~mythtv/linux-2.6-usb-aten-cs-1742.patch
--- linux-2.6.17.i686/drivers/usb/input/hid-core.c.orig 2006-06-18
02:49:35.000000000 +0100
+++ linux-2.6.17.i686/drivers/usb/input/hid-core.c 2006-10-11
23:00:47.000000000 +0100
@@ -1445,6 +1445,7 @@
#define USB_DEVICE_ID_ATEN_2PORTKVM 0x2204
#define USB_DEVICE_ID_ATEN_4PORTKVM 0x2205
#define USB_DEVICE_ID_ATEN_4PORTKVMC 0x2208
+#define USB_DEVICE_ID_ATEN_CS1742 0x2255
#define USB_VENDOR_ID_TOPMAX 0x0663
#define USB_DEVICE_ID_TOPMAX_COBRAPAD 0x0103
@@ -1680,6 +1681,7 @@
{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_2PORTKVM,
HID_QUIRK_NOGET },
{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVM,
HID_QUIRK_NOGET },
{ USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_4PORTKVMC,
HID_QUIRK_NOGET },
+ { USB_VENDOR_ID_ATEN, USB_DEVICE_ID_ATEN_CS1742,
HID_QUIRK_NOGET },
{ USB_VENDOR_ID_BTC, USB_DEVICE_ID_BTC_KEYBOARD,
HID_QUIRK_NOGET},
{ USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_USBHUB_KB,
HID_QUIRK_NOGET},
{ USB_VENDOR_ID_CREATIVELABS,
USB_DEVICE_ID_CREATIVELABS_SILVERCREST, HID_QUIRK_NOGET },
However I suspect this isn't as simple as I'd hoped. I got no joy
from that attempt.
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