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#1 2013-08-12 16:49:43
- Naxelyss
- Member
- Registered: 2013-08-11
- Posts: 5
KMS and radeon driver
Hello,
I have some trouble with Kernel Mode Setting and the opensource radeon driver. I have an iMac mid 2010 with a HD4670 card.
When I boot archlinux my screen turn black, but I can still login and do a blind reboot.
I can login if I add the 'nomodeset' option to disable KMS, but then I can't get my X server working because the radeon driver will complain about the lack of KMS.
Can anyone help me ?
PS : I'm sorry about my terrible english, it's not my native language.
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#2 2013-08-12 18:42:59
- sekret
- Member
- Registered: 2013-07-22
- Posts: 285
Re: KMS and radeon driver
What options do you have in your grub config? Did you try booting with no option at all?
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#3 2013-08-13 00:50:17
- Naxelyss
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- Registered: 2013-08-11
- Posts: 5
Re: KMS and radeon driver
I only have the nomodeset option. This allow me to bypass KMS and to reach the login prompt.
When I remove this option, as I already said, It's an instant blackscreen.
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#4 2013-08-13 01:26:25
- cfr
- Member
- From: Cymru
- Registered: 2011-11-27
- Posts: 7,132
Re: KMS and radeon driver
Your English is very nearly perfect.
Is this a new install? Or did this work before a recent upgrade? If the latter, you probably need to downgrade the kernel. Search these forums - there are a bunch of these issues affecting both intel and ati as far as I can tell.
If it is a new install, did you need nomodeset to boot the install media?
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#5 2013-08-13 01:47:28
- Naxelyss
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- Registered: 2013-08-11
- Posts: 5
Re: KMS and radeon driver
Yes, it's a new install.
I needed nomodeset to boot my install USB key.
Aren't there any logs made during KMS ?
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#6 2013-08-13 01:56:49
- cfr
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- From: Cymru
- Registered: 2011-11-27
- Posts: 7,132
Re: KMS and radeon driver
What do you mean during KMS?
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#7 2013-08-13 02:18:06
- Naxelyss
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- Registered: 2013-08-11
- Posts: 5
Re: KMS and radeon driver
I mean during boot, when the kernel try to do some black magic with my screen, messing everything up - that's the purpose of Kernel Mode Setting, isn't it ? 
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#8 2013-08-13 02:29:53
- cfr
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- From: Cymru
- Registered: 2011-11-27
- Posts: 7,132
Re: KMS and radeon driver
Well, messing everything up isn't exactly its purpose but, yes, I know what you mean.
If you are switching to KMS late, it will be logged. If you are using early KMS, probably not unless you enable logging in early user space by passing rd.log on the kernel command line.
CLI Paste | How To Ask Questions
Arch Linux | x86_64 | GPT | EFI boot | refind | stub loader | systemd | LVM2 on LUKS
Lenovo x270 | Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz | Intel Wireless 8265/8275 | US keyboard w/ Euro | 512G NVMe INTEL SSDPEKKF512G7L
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