After running kernel 5.12-rc1 for short time, it crashed: ……………………………. usb 1-1.1.1.5: USB disconnect, device number 11 usb 1-1.1.1.5.4: USB disconnect, device number 12 cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 BUG: kernel NULL pointer dereference, address: 0000000000000278 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) – not-present page PGD 0 P4D 0 Oops: 0000 … Continue reading →
Thanks to Heiner Kallweit for info on two USB patches for the Odroid C2, and thanks to John Youn for the patches themselves.. They can be found at http://www.spinics.net/lists/linux-usb/msg151687.html and http://www.spinics.net/lists/linux-usb/msg151688.html . I have applied these to Kernel 4.10-rc4 (including the Ethernet TX patch) and now USB is working, and detects/connects devices – sort of.. Plug in … Continue reading →
I recently acquired a vintage (2006?) Minolta Elite 5400 II scanner, and – according to the VueScan support info, I needed to ”set up libusb device protections”.. That info included a link to a somewhat ancient SANE USB support page – last changed in 2003!.. That rang a bell, and I guessed that I had to mess … Continue reading →
I had been trying to get USB working with 3.17 and 3.18-rc kernels on my Odroid U3 for some time, and had been looking for fixes in the source code. It turned out that I was looking in the wrong place – and a clue to this was the lack of any mention of the problem on … Continue reading →
There have been several ‘Kernel 3.13’ patches on various sites for the latest NVIDIA drivers, and I have finally found one that – on my system – actually works, without causing uvcvideo / usb problems (see previous articles..) Thanks to the folks at ArchLinux, the patch can be found here: https://projects.archlinux.org/svntogit/packages.git/plain/trunk/nvidia_3.13_kernel.patch?h=packages/nvidia Be aware that there are other … Continue reading →
After some problems with uvcvideo / usb under 3.13 producing non-working camera and audio, and producing a ‘tombstone’, I have reverted to 3.12.8 for the time being.. More research is needed, and I have set up a 3.13 ‘guest’ under VMware to conduct further tests, without the ‘kernel taint’ of NVIDIA drivers, etc.. [50677.696508] cannot submit urb … Continue reading →
I have just updated the Raspberry Pi to kernel 3.2.29, from the latest Pi kernel 3.2.27 at https://github.com/raspberrypi/linux, plus the two incremental patches from ftp://ftp.kernel.org/pub/linux/kernel/v3.0/incr/ The system is OK, and USB seems to be more stable than before, even after plugging in USB1.1 devices.. Fedora release 17 (Beefy Miracle) Kernel 3.2.29-pi on an armv6l (ttyAMA0) ………. usb … Continue reading →
I had got tired of trying all the so-called ‘recommendations’ for fixing USB hub connectivity on the Raspberry Pi – including some from people who did not actually own one.. And yes, I do have the correct voltage power supply etc. etc… So – I was happy to see that there was -at least – a potential … Continue reading →
After many fruitless attempts to cobble together a working USB hub setup for the Raspberry Pi, I came to the conclusion – after trying all the USB/mains power adapters I had (from various phones and other accessories), that the power supply made a significant difference to the behaviour of the Pi.. With some adapters, I had to … Continue reading →
Thought I would try a couple more options, just in case.. First, I confirmed that the USB sound card works connected directly to one of the Pi USB ports (using a USB extension cable): usb 1-1.2: new full speed USB device number 13 using dwc_otg usb 1-1.2: New USB device found, idVendor=0d8c, idProduct=000c usb 1-1.2: New USB … Continue reading →