On Sun, Mar 17, 2019 at 06:24:59AM +0800, Yifeng Li wrote: > On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), the amount of Video > RAM is not detected correctly by the xf86-video-siliconmotion driver. > This is because sm712fb overwrites the GPR71 Scratch Pad Register, which > is set by BIOS on x86 and used to indicate amount of VRAM. > > Other Scratch Pad Registers, including GPR70/74/75, don't have the same > side-effect, but overwriting to them is still questionable, as they are > not related to modesetting. > > Stop writing to SR70/71/74/75 (a.k.a GPR70/71/74/75). > > Signed-off-by: Yifeng Li <tomli@xxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v4.4+ Tested-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx> -- Regards Sudip
