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./intel-gpu-freq.sh: 393: sleep: Stale file handle

ERROR: intel-gpu-freq.sh: Failed to read freq info from: /sys/class/drm/card0/gt_act_freq_mhz

ERROR: intel-gpu-freq.sh: Failed to read freq info from: /sys/class/drm/card0/gt_min_freq_mhz

ERROR: intel-gpu-freq.sh: Failed to read freq info from: /sys/class/drm/card0/gt_cur_freq_mhz