https://bugs.freedesktop.org/show_bug.cgi?id=42960
--- Comment #32 from Sandeep sandy.8925@gmail.com --- I tested with 3.15-git , and it looks like the kernel parameter has no effect there - the same problem occurs again! Even with acpi_sleep=s3_bios , on suspend and resume the laptop LVDS display is blank.
Does anyone know if this was an intentional change, to remove the ability to do this?