Re: "EDID checksum is invalid"

On Tue, Jan 6, 2015 at 11:32 PM, Daniel Vetter daniel@ffwll.ch wrote:

Yeah if the edid probe fails userspace will get a hotplug and autodisable the output. With a failsafe X session (just a dumb terminal) we can avoid that to check that dpms on itself would work or whether the edid probe fail here is just indicative of more trouble. Also please boot with drm.debug=0xe, repro and grab dmesg, that might shed some more light on what's failing.

Here is an annotated attachment with the dpms off output witj drm.debug=0xe.

It turns out the real failure case doesn't seem to be when the bad EDID happens. See my notes interspersed with the dmesg output.

Linus