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[ Upstream commit 22048c5485503749754b3b5daf9d99ef89fcacdc ] turbostat displays a GFXMHz column, which comes from reading /sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz But GFXMHz was not changing, even when a manual cat /sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz showed a new value. It turns out that a rewind() on the open file is not sufficient, fflush() (or a close/open) is needed to read fresh values. Reported-by: Yaroslav Isakov <yaroslav.isakov@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>