From mboxrd@z Thu Jan  1 00:00:00 1970
From: "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>
Subject: Re: KMScon vs. AMD Radeon
Date: Thu, 18 Apr 2019 09:05:39 +0200
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>, Mathieu Othacehe <m.othacehe@gmail.com>, Pierre Neidhardt <ambrevar@gmail.com>

On Wed, Apr 17, 2019 at 07:26:27PM +0200, pelzflorian (Florian Pelz) wrot=
e:
> Then the installed system has no graphics too (graphics freeze at the
> same message
>=20
> [   51.910992] fb0: switching to radeondrmfb from EFI VGA
>=20
> but I cannot add modprobe.blacklist=3Dradeon because GRUB does not
> recognize my USB keyboard now (in the installer=E2=80=99s GRUB the USB
> keyboard was recognized).
>=20

I dug out a PS/2 keyboard which works.  When adding
modprobe.blacklist=3Dradeon then GDM does not start.
/var/log/gdm/greeter.log contains beside various expected errors for
fbdev:

(EE) open /dev/fb0: Permission denied


So i did

chmod 777 /dev/fb0
herd restart xorg-server

but it still says permission denied on /dev/fb0.

Regards,
Florian