On Jan 23 21:09:10, h...@stare.cz wrote:
> these are the errors drm reports:
> 
> Jan 23 15:03:49 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 15:27:35 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 16:05:40 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 16:09:07 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 16:20:30 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 16:20:49 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 16:30:49 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 16:32:23 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 16:44:46 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 17:19:17 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 17:33:51 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 17:35:18 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 17:47:09 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 17:49:58 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 18:02:08 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 19:20:16 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> Jan 23 19:30:34 mb /bsd: drm:pid35173:iomfb_poweroff_v12_3 *ERROR* 
> dcp_poweroff() done
> Jan 23 19:41:14 mb /bsd: drm:pid35173:iomfb_poweron_v12_3 *ERROR* 
> dcp_poweron() starting
> 
> That pid is the X process. The times are when the screensaver kicks in.
> After 'xset s blank s activate', the screen blanks for a moment,
> but lights backup up almost immediately, dimmed; after Fn+F2
> (on this macbook) it lights up fully. How can I debug this?

Also, video does not light back up after closing and opening the lid.
This is with machdep.lidaction=0:

Jan 23 21:59:02 mb /bsd: drm:pid60117:iomfb_poweroff_v12_3 *ERROR* 
dcp_poweroff() done
Jan 23 21:59:02 mb /bsd: uhub0 detached
Jan 23 21:59:02 mb /bsd: uhub1 detached
Jan 23 21:59:27 mb /bsd: uhub0 at usb0 configuration 1 interface 0 "Generic 
xHCI root hub" rev 3.00/1.00 addr 1
Jan 23 21:59:27 mb /bsd: uhub1 at usb1 configuration 1 interface 0 "Generic 
xHCI root hub" rev 3.00/1.00 addr 1
Jan 23 21:59:27 mb /bsd: drm:pid60117:iomfb_poweron_v12_3 *ERROR* dcp_poweron() 
starting
Jan 23 21:59:27 mb /bsd: aplsmc0: system 1.03 W


After opening the lid, the machine apparently gets operating again,
as witnessed by the pinging ping pinging the pings again (to another
machine), but the screen remains black.

        Jan

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