[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

--- Comment #29 from Karthik B S <karthik.b.s at intel.com> ---
Hi,

Sorry for the delay in reply.
I actually tried to reproduce the bug at our end multiple times, but have not
been successful till now.
Also I'm having some issue with the .dat file format, the file I have seems
partially corrupted. A .txt file would suffice.
I've narrowed the ftrace to 4 functions so that the buffer doesn't get
overwritten.

Could you please run the below steps.
echo 0 > /sys/kernel/debug/tracing/tracing_on
echo nop > /sys/kernel/debug/tracing/current_tracer
echo "intel_atomic_commit" "intel_atomic_commit_tail"
"intel_cpu_fifo_underrun_irq_handler" "gen8_de_irq_handler" >
/sys/kernel/debug/tracing/set_ftrace_filter
echo function > /sys/kernel/debug/tracing/current_tracer
echo 0 > /sys/kernel/debug/tracing/events/enable
echo 1 > /sys/kernel/debug/tracing/events/i915/i915_reg_rw/enable
echo 1 > /sys/kernel/debug/tracing/tracing_on

And once you've seen the flicker, dump the trace into a log file.
cat /sys/kernel/debug/tracing/trace > trace.log

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