On Sun, 10 Oct 2021 14:22:41 +0200, Greg Kroah-Hartman wrote: > > The Schiit Hel device does not like to respond to all get_ctl_value_v2() > requests for some reason. This used to work in older kernels, but now > with more strict checking, this failure causes the device to fail to > work. > > Cc: Jaroslav Kysela <perex@xxxxxxxx> > Cc: Takashi Iwai <tiwai@xxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > --- > > This fixes the Shiit Hel device that I have. It used to work on older > kernels (a year ago?), but stopped working for some reason and I didn't > take the time to track it down. This change fixes the issue for me, but > feels wrong for some reason. At least now I can use the device as a > headphone driver, much better than the built-in one for my current > machine... > > If needed, I can take the time to do bisection to track down the real > issue here, it might be due to stricter endpoint checking in the USB > core, but that feels wrong somehow. > > Here's the debugfs USB output for this device, showing the endpoints: > > T: Bus=07 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#= 5 Spd=480 MxCh= 0 > D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1 > P: Vendor=30be ProdID=0101 Rev=01.02 > S: Manufacturer=Schiit Audio > S: Product=Schiit Hel > C: #Ifs= 4 Cfg#= 1 Atr=c0 MxPwr=0mA > I: If#= 0 Alt= 0 #EPs= 1 Cls=01(audio) Sub=01 Prot=20 Driver=snd-usb-audio > E: Ad=8f(I) Atr=03(Int.) MxPS= 6 Ivl=1ms > I: If#= 1 Alt= 1 #EPs= 2 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio > E: Ad=05(O) Atr=05(Isoc) MxPS= 104 Ivl=125us > E: Ad=85(I) Atr=11(Isoc) MxPS= 4 Ivl=1ms > I: If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio > E: Ad=88(I) Atr=05(Isoc) MxPS= 156 Ivl=125us > I: If#= 3 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid > E: Ad=84(I) Atr=03(Int.) MxPS= 16 Ivl=1ms > > Any other suggestions to fix this are welcome. Could you show the exact error messages and lsusb -v output? We may paper over only the problematic node instead. thanks, Takashi
