Hi,
I would like to enable a trace event early so that i can view the debug
statements trace generated during usb 3.0 host controller driver
initialization.
I followed the instruction in Documentation/trace/events.txt:
"In order to facilitate early boot debugging, use boot option:
trace_event=[event-list] where event-list is a comma separated list of
events."
and added trace_event=[xhci-hcd:xhci_dbg_init] (where xhci-hcd is the
trace system and xhci_dbg_init is the trace event that i want to enable)
in the boot parameters but it did not work.
More specifically, I added in /etc/grub/default:
GRUB_CMDLINE_LINUX="trace_event=[xhci-hcd:xhci_dbg_init]"
After updating grub, boot parameters in /boot/grub/grub.cfg were changed
into:
linux /boot/vmlinuz-3.9.9.130805+
root=UUID=8af1b7fc-76c1-4cab-97ef-78ef5e29e084 ro
trace_event=[xhci-hcd:xhci_dbg_init] quiet radeon.audio=1
Do I miss something? Any advice would be appreciated.
best regards,
ksenia
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