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Problem with Radeon 7480D graphics

asked 2018-05-01 10:42:59 -0600

awhpaul gravatar image

Ok, this one has been doing my nut for a few days now... I have a HTPC that sits under my main TV and runs everything from File server to kodi. Until now it has been running windows 7 but that recently encountered a windows update issue and died on me. As i've moved my laptop over to Fedora :) I thought i'd try and switch the HTPC and experiment with Docker for my server apps. BUT...

It simply won't boot after install. The live usb works fine and the install completes without issue but when I reboot I get the grub screen and then a reboot. This repeats for ever. I've tried several different distros and all are exactly the same.

As far as I can tell this is down to the kernal drivers for Radeon and AMDGPU. The 7480D (i'm using an AMD A4-4000 APU) isn't supported by the AMDGPU driver and needs the Radeon driver. If I set nomodeset it will boot but all I can get is 640x480. I've tried every combination of blacklist I can find online but the AMDGPU won't go away. I've tried the grub blacklist parameters and also adding to the blacklist.conf under /etc/modprobe.d

I really don't want to put windows 10 on this, please help.

Thanks

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7480D can't work with xorg-x11-drv-amdgpu and shouldn't even try to. Are you sure you've got it installed and use it? Run dnf remove xorg-x11-drv-amdgpu and dnf install xorg-x11-drv-ati to make sure you've got proper driver available.

Maybe it's a hardware issue? It would be a new low for MS to brake hardware with an update, though I've seen enough to be not surprised...

ozeszty gravatar imageozeszty ( 2018-05-02 03:15:32 -0600 )edit

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answered 2018-05-02 04:07:38 -0600

awhpaul gravatar image

Just for my own sanity I did install win 10 last night and it's working fine. This tells me it's not hardware related.

I'll reinstall fedora today and try your suggestion. Asumming I do this from the recovery console as the machine won't boot?

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If several distros are affected, it's probably some regression in kernel. Are you using Fedora 28? What was the oldest kernel you tried?

Boot with nomodeset, you'll have regular system with graphics rendered on CPU.

ozeszty gravatar imageozeszty ( 2018-05-02 06:10:28 -0600 )edit

Ok, reinstalled Fedora 28 and same issue. Adding nomodeset does allows the system to boot but the only available resolution is 640x480.

I followed the suggestions above and removed amdgpu and installed ati. Still won't boot without nomodeset but executing modprobe radeon modeset=1 after boot seems to work and I get the correct driver and resolution options. Very weird.

Problem definitely appears to be at the kernel level. What's the best way to run the above modprobe every boot.

awhpaul gravatar imageawhpaul ( 2018-05-02 06:38:48 -0600 )edit

Ok, got this working by keeping the nomodeset directive to allow the system to boot and then using a systemd service to execute the modprobe command.

Bit of a hack but so far so good.

awhpaul gravatar imageawhpaul ( 2018-05-03 05:36:52 -0600 )edit

Same issue here. the latest usable kernel for me is "kernel-4.13.9-300.fc27.x86_64".

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cypress PRO [Radeon HD 5850] Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 0b00 Kernel driver in use: radeon

like @awhpaul, I managed to increase my success rate to 70% by using "radeon.modeset=1"... I also failed to get any logs or crash dump. Is there a bugzilla for this ?

h0neybadger gravatar imageh0neybadger ( 2018-05-08 06:22:46 -0600 )edit

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Asked: 2018-05-01 10:42:59 -0600

Seen: 417 times

Last updated: May 02