diff options
| author | Yifeng Li <tomli@tomli.me> | 2019-04-01 17:46:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-11 12:23:47 +0200 |
| commit | 6c2fb5beecba9837e5298c92a22b40ee7e71ec97 (patch) | |
| tree | 99d438d401ecf90f211f87d26ba43abf6408a07f /tools/perf/scripts/python | |
| parent | dbc86a927d6666c856cb6a096c7977c91f805a9c (diff) | |
fbdev: sm712fb: fix brightness control on reboot, don't set SR30
commit 5481115e25e42b9215f2619452aa99c95f08492f upstream.
On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), rebooting with
sm712fb framebuffer driver would cause the role of brightness up/down
button to swap.
Experiments showed the FPR30 register caused this behavior. Moreover,
even if this register don't have side-effect on other systems, over-
writing it is also highly questionable, since it was originally
configurated by the motherboard manufacturer by hardwiring pull-down
resistors to indicate the type of LCD panel. We should not mess with
it.
Stop writing to the SR30 (a.k.a FPR30) register.
Signed-off-by: Yifeng Li <tomli@tomli.me>
Tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: <stable@vger.kernel.org> # v4.4+
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions