Comment # 34
on bug 42960
from D
(In reply to comment #32) > 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? Hi, did you check using echo mem > /sys/power/state? Because e.g. pm-suspend resets those parameters via /proc/sys/kernel/acpi_video_flags. (Value should be 1, 2, or 3 if you have kernel parameters set) For pm-suspend to work (e.g. *Ubuntu) you need to create a file /etc/pm/config.d/radeon which contains QUIRK_S3_BIOS="true" QUIRK_S3_MODE="true"
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