From mboxrd@z Thu Jan  1 00:00:00 1970
From: boris.dekshteyn@gmail.com (Boris A. Dekshteyn)
Subject: Re: X/GDM fails on linux 5.0.7 AMD Radeon RX 580 after system
	reconfigure
Date: Sat, 11 May 2019 00:12:25 +1200
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References: <871s17fwmp.fsf@ambrevar.xyz>
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In-Reply-To: <871s17fwmp.fsf@ambrevar.xyz> (Pierre Neidhardt's message of
	"Thu, 09 May 2019 17:58:06 +0200")
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Pierre Neidhardt <mail@ambrevar.xyz> writes:

> Hi,
>
> My last system reconfigure dates back to April 17th and works
> flawlessly.
> Yesterday I ran a new one and X / GDM don't start up properly:
>
> - I can guess bits and pieces of the GDM interface but the screen is
>   torn asunder by the most epic artifacts (green / purple flashing tiles).
>
> - In a TTY, I see that GDM is restarting in an infinite loop.
>
> - dmesg reports some "corruption" at the level of the video card (AMD
>   Radeon RX 580).
>
> The weird thing is that I'm still using Linux 5.0.7 like I was on April
> 17th and everything worked well.
>
> I've tried both with linux-libre and a custom kernel.
>
> Have we changed anything to the boot parameters maybe?
>
>
> Side question: how do we know which Guix commit was used for a specific
> system generation?  For now the only way I can think of is
>
> /var/guix/profiles/system-17-link/profile/bin/guix --version
>
> Anything more convenient?  From Emacs Guix?

See bug#35575. If you have the same symptoms, the problem is most likely
that mesa does not check its shader cache. Working solution - clear
$HOME/.cache/mesa_shader_cache/

-- 
WBR, Boris Dekshteyn