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A comment on Debian and firmware. Parent comment

Re:Debian and firmware by anthk on Tuesday April 19, 2022 @06:53AM (#31081535)
The Radeon module works on non-accelerated mode with the modesetting driver instead of the xorg Radeon one.

At /usr/share/X11/xorg.conf.d/10-radeon.conf:

     Section "Device"
 identifier "Radeon"
 Driver "modesetting"
    EndSection
Bugs may arise, maybe it could be a good idea to disable the Composite extension too.
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Re:Debian and firmware by tremon on Tuesday April 19, 2022 @11:05AM (#31084122)
I guess I confused the issue by referring it as the "radeon driver", but I meant to implicate the radeon.ko kernel module, not the radeon(4) Xorg driver. The servers I'm talking about don't even have X installed (they're Ceph OSD nodes).
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Re:Debian and firmware by anthk on Tuesday April 19, 2022 @11:09AM (#31084181)
Linux libre here. I ran Trisquel on TTY mode to debug issues, I modprobed the radeon module and KMS switched the resolution to a native one in a laptop. Starting X with the radeon driver for X messes everything garbled up. The modesetting driver works, but no GL.

TTY works well before and after KMS.

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