> I saw a message on this list from a month ago or so about someone
> trying to make the usb control work for an apple studio display. I
> was wondering whether that person got it to work, and if not, if he
> needs help at all.
Same here. We've got a couple of Studio Displays (the old blue/white
tubes) attached to x86 Linux machines here. The settings that are in
the monitor right now are generally okay, but they could be better
with some stretching and positioning. They're nice monitors, but
unfortunately have no front-panel controls beyond brightness and
contrast.
Just today, though, things got worse. I put a KVM switch between a
machine and a monitor, and now text mode consoles are completely
wrong: they're only covering about 2/3 of the screen vertically, and
extend several characters past the left edge of the screen.
It was suggested before to try using hiddev to talk to the monitor.
When I plug the monitor into the computer, load uhci/input/hid/etc,
the only thing that shows up in the device tree is the USB hub within
the monitor.
This is stock kernel 2.4.22, BTW.
I know these monitors _can_ be controlled over the USB cable, because
the old G3 Mac they came with could do it. But from what I see,
there's no indication in Linux that they they even exist on the USB
bus, much less conform to the HID monitor specification. I tried two
different monitors on two different machines, and in both cases all
that shows up on the bus is the monitor's hub.
Note that the hub in the monitor _does_ work under Linux. If I plug in
a HID joystick and/or keyboard (barcode scanner, really), the OS and
applications can see them.
FWIW, here's what "lsusb -v" has to say about the hub:
Bus 001 Device 003: ID 05ac:9110 Apple Computer
Language IDs: none (invalid length string descriptor bf; len=0)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x05ac Apple Computer
idProduct 0x9110
bcdDevice 0.01
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 2mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 1
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 1
bInterval 255
Language IDs: none (invalid length string descriptor bf; len=0)
And here's the contents of /proc/bus/usb/devices, with the monitor being
the only thing attached to the USB port on the computer:
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 11/900 us ( 1%), #Int= 1, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI-alt Root Hub
S: SerialNumber=b400
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=12 MxCh= 5
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=05ac ProdID=9110 Rev= 0.01
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 2mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=01 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms
Any thoughts on how to get control over this monitor would be
appreciated. The old G3 is still around but out of service. If there
is some easy way to sniff/analyze how it talks to the monitor, I might
be able to get it up and running again with MacOS 9 or linuxppc and do
some testing.
-Dave Dodge
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