Hello:

I build a 'crosshatch' kernel by excuting 

build/build.sh -j20

Also, for improving the building speed, i disable the LTO (Link time 
optimization) feature by 
add the following content to build.config file:

POST_DEFCONFIG_CMDS="check_defconfig && update_debug_config"
function update_debug_config() {
    ${KERNEL_DIR}/scripts/config --file ${OUT_DIR}/.config \
         -d LTO \
         -d LTO_CLANG \
         -d CFI \
         -d CFI_PERMISSIVE \
         -d CFI_CLANG
    (cd ${OUT_DIR} && \
     make O=${OUT_DIR} $archsubarch CC=${CC} CROSS_COMPILE=${CROSS_COMPILE} 
olddefconfig)
}

So, after flash the new boot.img to my Pixel 3 XL, i found that the touch 
panel didn't work any more.

Before this step, I build my Image.lz4-dtb with the LTO feature. and every 
thing  just worked well.

So any suggestions about this situation ?????

Thanks a lot .

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