Kernels >= 6.3 disable video output

[Alex Deucher]

On Fri, May 9, 2025 at 9:39 AM Steven J Abner <pheonix.sja at att.net> wrote:
>
> On Fri, May 9 2025 at 01:11:17 PM +0000, Alex Deucher
> <alexdeucher at gmail.com> wrote:
> > What display(s) are you using and how are they connected?  Can you
> > bisect?
>
> Not sure the question, but it's a tv thru HDMI.
>
> Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
> DisplayPort-0 disconnected primary (normal left inverted right x axis y
> axis)
> HDMI-A-0 connected 1920x1080+0+0 (normal left inverted right x axis y
> axis) 575mm x 323mm
>    1920x1080 60.00*+ 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
>
> And hopefully to verify, 3 OSs run fine: Ubuntu/Elementary 5.4, PearlOS
> 5.15, and LFS 5.15 thru 6.2.16. 6.3 and above has 70% fail rate with
> firmware built in to kernel, no fail if no firmware. Mainline 6.8 was
> on PearlOS.

Is it specific to that particular TV or can you reproduce the problem
on other HDMI connected displays?  Can you narrow down where it broke?
 E.g., if 6.2.16 works, but 6.2.17 is broken, can you use git to
bisect between 6.2.16 and 6.2.17 to identify the commit which broke
it?

Alex