This is a note to let you know that I've just added the patch titled tools/power turbostat: bugfix: GFXMHz column not changing to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tools-power-turbostat-bugfix-gfxmhz-column-not-changing.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Thu Oct 5 10:28:31 CEST 2017 From: Len Brown <len.brown@xxxxxxxxx> Date: Sat, 4 Mar 2017 15:42:48 -0500 Subject: tools/power turbostat: bugfix: GFXMHz column not changing From: Len Brown <len.brown@xxxxxxxxx> [ 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@xxxxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/power/x86/turbostat/turbostat.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -2003,8 +2003,10 @@ int snapshot_gfx_mhz(void) if (fp == NULL) fp = fopen_or_die("/sys/class/graphics/fb0/device/drm/card0/gt_cur_freq_mhz", "r"); - else + else { rewind(fp); + fflush(fp); + } retval = fscanf(fp, "%d", &gfx_cur_mhz); if (retval != 1) Patches currently in stable-queue which might be from len.brown@xxxxxxxxx are queue-4.9/tools-power-turbostat-bugfix-gfxmhz-column-not-changing.patch