workarounds: prefer modetest over xrandr for display output dumping. Many CrOS systems have converted to freon. As such xrandr is no longer available on those systems but has been replaced by modetest. CL checks for modetest and makes appropriate call if available. If not it continues to call xrandr. BUG=none TEST=manual 1. emerge-samus workarounds 2. cros deploy <samus host> workarounds 3. generate_logs In generate_logs stdout see: Dumped modetest output instead of: /usr/bin/generate_logs: line 70: /usr/bin/xrandr: No such file or directory Also find expected output in diagnostic_logs/modetest_output.txt Change-Id: I7c17d5ba04f3708aabeb1e66110d2b5263c63cc8 Reviewed-on: https://chromium-review.googlesource.com/268541 Reviewed-by: Kris Rambish <krisr@chromium.org> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org> Tested-by: Todd Broch <tbroch@chromium.org> Trybot-Ready: David James <davidjames@chromium.org> Commit-Queue: David James <davidjames@chromium.org>
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