WORKAROUND FOUND:
in the radeon driver section, add the line
Option "MonitorLayout" "LVDS,NONE"
The problem might lie in this snippet of code in radeon_driver.c
function RADEONDisplayPowerManagementSet:
case DPMSModeOff:
/* Screen: Off; HSync: Off, VSync: Off */
if (info->IsSecondary)
OUTREGP(RADEON_CRTC2_GEN_CNTL, mask2, ~mask2);
else {
if (info->MergedFB)
OUTREGP(RADEON_CRTC2_GEN_CNTL, mask2, ~mask2);
OUTREGP(RADEON_CRTC_EXT_CNTL, mask1, ~mask1);
}
break;
}
I am not sure what the correct policy would be, so I will leave it to
you.
--
[Feisty] DPMS no longer switches off backlight on radeon
https://bugs.launchpad.net/bugs/106414
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