The P4M900 is another Chrome9 via chipset. Its pci id is not in drm git tree. Attached patch adds it. See https://bugs.freedesktop.org/show_bug.cgi?id=9370 for details on Chrome9 support.
Created attachment 11219 [details] [review] P4M900 pci id patch
I'm not sure why you think setting 6.8-branch is a useful thing to do.
I'm not sure either. I though setting the flag to '?' might be used to show a patch that needs to be reviewed, and '+' and '-' to respectively ACK or NACK it. At least that's how I had to use it in the xorg 6.8 era. I was wrong, but actually someone saw it, so it sorta worked.
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