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512042eba8
Add VgaInb() helper function to read vga registers. With that in place fix the unblanking. We need to put the ATT_ADDRESS_REGISTER flip flop into a known state, which is done by reading the INPUT_STATUS_1_REGISTER. Reading the INPUT_STATUS_1_REGISTER only works when the device is in color mode, so make sure that bit (0x01) is set in MISC_OUTPUT_REGISTER. Currently the mode setting works more by luck because ATT_ADDRESS_REGISTER flip flop happens to be in the state we need. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>