CM-T335: Linux: Known Issues Legacy

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Enlightenment Window Manager
  • If the Touchscreen profile is selected the Settings Panel doesn't have Profiles setting menu. It is not possible to switch the profile.
Workaround : Launch the xterm from Applications->Accessories and change the default profile from the command line:
enlightenment_remote -default-profile-set Standard-copy
Frame buffer console
  • Sometimes the Frame buffer console is not visible and not possible to use.
Workaround : Use the serial or network ssh console.
Bluetooth initialization timed out
  • Sometimes attaching the ttyO1 serial port to the HCI Bluetooth subsystem can time out with the following message:
root@cm-debian:~# hciattach -s 115200 /dev/ttyO1 texas 3000000
Initialization timed out.
Workaround : Reset the WL1271 Bluetooth module manually, then run the hciattach command again:
root@cm-debian:~# echo 0 > /sys/class/gpio/gpio19/value
root@cm-debian:~# echo 1 > /sys/class/gpio/gpio19/value
root@cm-debian:~# hciattach -s 115200 /dev/ttyO1 texas 3000000
Found a Texas Instruments' chip!
Firmware file : /lib/firmware/TIInit_7.6.15.bts
Loaded BTS script version 1
texas: changing baud rate to 3000000, flow control to 1
[  406.694167] Bluetooth: HCI UART driver ver 2.2
[  406.698847] Bluetooth: HCI H4 protocol initialized
[  406.703912] Bluetooth: HCI BCSP protocol initialized
[  406.709097] Bluetooth: HCILL protocol initialized
Device setup complete
Network interface name change
  • Network interface name can change if used with rootfs on NFS by more then a single CM-T335 unit.
Workaround 1: Delete the udev persistent network interface rules file - should be repeated after every unit replacement:
root@cm-debian:~# rm /etc/udev/rules.d/70-persistent-net.rules
root@cm-debian:~# reboot
Workaround 2: Disable persistent network interface rules:
root@cm-debian:~# echo "# disable net-generator rules in /lib/udev" > /etc/udev/rules.d/75-persistent-net-generator.rules
root@cm-debian:~# reboot