On Sun, Mar 17, 2019 at 06:24:58AM +0800, Yifeng Li wrote: > 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@xxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v4.4+ Tested-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx> -- Regards Sudip
