My Radeon R5 230 has always worked with modesetting in Full HD out of the box. It is strange why this is no more supported. Even worse if I have to activate the VESA driver this one only yields 640x480. However the VESA standard would also support Full HD, something I remember that has already been implemented with Xorg. I have noted that the driver name has changed from radeon to amdgpu. The radeon kernel module is loaded. xorg-x11-driver-radeon is installed and I wonder why I can not state "radeon" in the Driver section of my xorg.conf
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01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
This is what xrandr offers with the vesa driver:
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
> [ 2141.996] (II) AMDGPU(0): [KMS] drm report modesetting isn't supported.
means the amdgpu kernel driver didn't initialize. Please attach the output of dmesg.
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dmesg from another boot with the same Debian Live CD
You need to install the firmware package:
[ 1.629363] [drm:radeon_pci_probe [radeon]] *ERROR* radeon kernel modesetting for R600 or later requires firmware installed
Ahh, I should have known. That is a detriment with the Debian live dvd. Basically I could install the firmware with hindsight and then restart the X-server.
There is another bug with the VESA driver which has gone unreported yet. If the DPMS standbys the screen then the color palette is wrong on resume (no s2ram, only a display standby). I wonder if anyone cares to still support the VESA driver.