Hi Michael, On Sat, Sep 26, 2020 at 02:32:21PM +0200, Michael Zimmermann wrote: > The acpi _HID name of the device is "ITE8708" and the device works > with linux's ITE8708 config. > > I can't find any datasheet or even product page for that IC so I don't > know what footprint to look for when looking at the PCB - none of the > bigger ICs near the IR sensor have that name on them and the smaller > ones usually don't have any useful information printed on them. > Additionally I can only access one side of the PCB because I couldn't > figure out how to fully disassemble the device yet. This is a super i/o device, so this handles stuff like serial ports, parallel ports, floppy disks. All the legacy stuff you don't need any more. There is a coreboot tool which can identify super i/o devices: https://www.coreboot.org/Superiotool The super io devices I've seen are about 2cm by 3cm. I could find a datasheet for the IT8712F on google. Sean PS. Please don't top post. > > Thanks > Michael > > On Sat, Sep 26, 2020 at 1:30 PM Sean Young <sean@xxxxxxxx> wrote: > > > > On Sat, Sep 26, 2020 at 10:22:46AM +0200, Michael Zimmermann wrote: > > > Hi, > > > > > > here's the resource descriptor from my DSDT: > > > Name (BUF0, ResourceTemplate () > > > { > > > IO (Decode16, > > > 0x0000, // Range Minimum > > > 0x0000, // Range Maximum > > > 0x01, // Alignment > > > 0x10, // Length > > > _Y1A) > > > IRQNoFlags (_Y1B) > > > {} > > > DMA (Compatibility, NotBusMaster, Transfer8, ) > > > {} > > > }) > > > > > > As you can see it uses 16 bytes for the IO region while the driver > > > drivers/media/rc/ite-cir.c expects 8. > > > I don't see any obvious reason why they do that since they only seem > > > to write two words in there, and if I edit the DSDT to change the > > > length from 0x10 to 0x8 the linux driver detects the device properly > > > it works just fine. > > > > > > So is this a bug on ASUS' side or should we just accept longer regions > > > for the same device type? > > > > So looking at the driver, some devices do have an io region of 16 and > > others expect 8. See the io_region_size field of ite_dev_descs. > > > > So for ITE8708 the io_region_size is set to 8. Does your device really > > have an ITE8708 or is the DSDT wrong? > > > > > > Sean
