[mythtv-users] Change on Raspberry PI OS to kernel 5.4.51 causing issues with Mythtv??

[Mike Bibbings]

On 22/07/2020 23:48, James Abernathy wrote:
>
>
> On Wed, Jul 22, 2020 at 6:33 PM James Abernathy <jfabernathy at gmail.com 
> <mailto:jfabernathy at gmail.com>> wrote:
>
>     I was helping someone on the forum with a mythtv light problem and
>     discovered I now had it also.
>
>     I just installed a fresh Raspberry Pi OS with Desktop and did a
>     full update and discovered that the kernel is now 5.4.51.
>     I use MikeB's pi-utils that install v31 mythtv-light and setup the
>     raspberry Pi for mythfrontend.  Always works until today.
>
>     I've attached the console output, but the key difference now is
>     that mythfrontend never starts and it seems to loop with the error
>     message below until you kill it from ssh.
>
>     Could not queue DRM page flip on screen HDMI1 (Invalid argument)
>
>     Jim A
>
> What seems to get around it is this:
>
> Get rid of the part referencing the json file:
>
> QT_QPA_EGLFS_KMS_CONFIG=/home/pi/pi_mythfrontend.json
> and added the export:
>
> export QT_QPA_EGLFS_ALWAYS_SET_MODE="1"
> Jim A
>

Jim,


Thanks for the information about QT_QPA_EGLFS_ALWAYS_SET_MODE="1".

Whilst your change will work for some configurations, the removal of 
QT_QPA_EGLFS_KMS_CONFIG=/home/pi/pi_mythfrontend.json causes other 
problems namely wrong screen configuration being used depending on 
capability of connected monitor/TV.

I have updated both run_mythfrontend.sh and run_mythsetup.sh at 
https://github.com/MikeB2013/pi-utils

The change is to add QT_QPA_EGLFS_ALWAYS_SET_MODE="1". to the existing 
command line as appropriate.


Tested on Pi4 and Pi3


Mike

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