https://bugs.freedesktop.org/show_bug.cgi?id=43829

--- Comment #29 from ka.nick@mail.ru ---
I've the same issue on my HP4545s laptop (A4-4300M CPU).
At boot time I get 
...
[drm:radeon_acpi_init] *ERROR* Cannot find a backlight controller
...
then the computer boots and works just fine (except the brightness control is @
/sys/class/backlight/radeon_bl0/brightness, commonly unrecognizable by the
software) but after resuming I have totally black screen. I can still ssh to
it: it resumes normally - the only thing that goes wrong is the screen remains
off. (It goes off as soon as the resume process begins). Kernels 3.9.X still
have the issue.
I'm not sure the absence of the ACPI-controllable brightness is relevant to the
case.

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