[mythtv-users] Display lost on HDMI TV power cycle

Gary Buhrmaster gary.buhrmaster at gmail.com
Sat Jul 12 20:37:06 UTC 2014


On Sat, Jul 12, 2014 at 7:49 PM, NickS <nicks272 at yahoo.co.uk> wrote:
...
> Please can someone recommend a solution? Thanks.

The "software" solution is to force the EDID value into
the driver/kernel.  You can use the drm_kms_helper
module (or the appropriate kernel boot line) to force a
specific edid value to be loaded from /lib/firmware (some
distro's location of firmware may be different).  You can
get the current edid value from a working edid entry from
the /sys/devices/... directory for a currently working instance
(usually something of the form of
 /sys/devices/pci<nnn>/<nnn>/drm/card<n>/card<n>-<something>/edid )

Note that you many need to place the file(s) into your
initramfs so that the values are available during boot
(kms dependent; I think a nomodeset kernel option
will avoid the requirement, but I have not actually tried it).

The "hardware" solution is something like the Gefen
HDMI Detective Plus (it saves the HDMI data and presents
it even if the TV is off, since it has its own power supply).
There are other vendors of equivalent products.


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