xrandr broken: failed to get size of the gamma for the output default

[alanbork]

after rpi-update 039088f

startx works fine, but if I try to run xrandr:
xrandr: Failed to get size of the gamma for the output default
and it just reports one resolution:
576x416

as far as I know my configuration is stock other than running rpi-update. And yes, it worked fine minutes before I ran rpi-update.

[alanbork]

realized I left out some useful details:

dtoverlay=vc4-fkms-v3d

Linux raspberrypi 5.4.61-v7l+ #1339 SMP Tue Sep 1 18:51:27 BST 2020 armv7l GNU/Linux

[popcornmix]

Can you identify the exact update which caused this. See:
https://github.com/Hexxeh/rpi-firmware/commits/master

If you click on each commit the end of the url contains a git hash. Run
sudo rpi-update <hash>
to revert back to that version. Report the first version with this error.

[alanbork]

That would be a lot easier if there was a way to tell what the previous commit number (git hash) I was running was. Then I could do a binary search, rather than a serial search. I was at least a month behind, maybe two before updating.

…

On Wed, Sep 2, 2020 at 3:59 AM popcornmix ***@***.***> wrote: Can you identify the exact update which caused this. See: https://github.com/Hexxeh/rpi-firmware/commits/master If you click on each commit the end of the url contains a git hash. Run sudo rpi-update <hash> to revert back to that version. Report the first version with this error. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#239 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANPGZ5MHKX72ILGV2HQOLIDSDYQPTANCNFSM4QSLWIRA> .

[alanbork]

This is going to be tricky to diagnose because it seems to come and go with reboots. Either it always works fine or it always fails.