Re: Tentative summary of the AMD/ATI/NVidia issue
On Sun, Apr 25, 2021 at 12:18:03PM +0100, Rebecca N. Palmer wrote:
> Cyril Brulebois wrote:
> > getting my hands on relevant hardware is in progress
>
> Note that https://lists.debian.org/debian-boot/2021/04/msg00247.html implies
> the affected hardware is _not_ simply "all AMD/ATI or NVidia hardware". Do
> we know of hardware that is reproducibly affected?
>
> YunQiang Su wrote:
> > The problem is that:
> > the older version of GNOME, or Mate, can work with vesa driver,
> > while current GNOME cannot.
>
> Do non-GNOME-based desktops work (either KDE, or one of the
> lightweight/for-old-hardware ones e.g. icewm), or is the problem further
> down the stack?
>
> Though even if these do work, the performance penalty of using vesa may well
> be too large for this to be a good solution.
>
>From looking earlier and response to Holger from my bug report:
if you are using UEFI, then there is an EFI VGA fallback mode - which might
be the same as VESA - so in my case is 800x600x16 or so.
With my AMD machines - requiring firmware-amd-graphics == older Radeon,
if the firmware is not there, then the machines will fall back to EFI VGA
graphics mode.
If the firmware is there, they will transfer to radeondrmfb framebuffer
device.
So for _one_ set of AMD hardware and specific radeon drivers, there exists
a fallback mode, irrespective of graphical environment, I think.
All best,
Andy C.
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