i915 IVB hangup after resume from s2mem since v6.6.x

[Johannes Stezenbach]

Hi,

so, git bisect pointed to:

 commit 701d2054fa317188cd4039c84e72c73254013b23
 Author: Thomas Zimmermann <tzimmermann at suse.de>
 Date:   Tue Jun 13 13:07:13 2023 +0200

    fbdev: Make support for userspace interfaces configurable

    Add Kconfig option CONFIG_FB_DEVICE and make the virtual fbdev
    ...

I think nothing on my system uses /dev/fb*, thus I had disabled
CONFIG_FB_DEVICE. Everything worked, only suspend/resume broke.
I can confirm v6.8.9 with CONFIG_FB_DEVICE=y works fine.

Maybe setting CONFIG_FB_DEVICE=n would allow you to reproduce
it in your CI tests?
Let me know if you still want me to file at bug report about this.


Best Regards,
Johannes