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bug#35408: External monitor not working with GDM

From: Ludovic Courtès
Subject: bug#35408: External monitor not working with GDM
Date: Thu, 02 May 2019 17:20:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux)

Ben Sturmfels <address@hidden> skribis:

>> On Fri, 26 Apr 2019, Ludovic Courtès wrote:
>>> Ben Sturmfels <address@hidden> skribis:
>>>> [   448.627] (II) RADEON: Driver for ATI/AMD Radeon chipsets:
>>> It looks like you have an AMD Radeon graphics card, is that right?  Did
>>> you pass “modprobe.blacklist=radeon” on the kernel command line, or
>>> something similar?
>>> Apparently some of these AMD graphics cards are not quite supported by
>>> free software, so that might be the issue here.
>> Whoops, sorry I'm being unintentionally misleading - I shuttle my hard
>> drive across from my X200 into an F2A85-M motherboard at work, which has
>> Radeon HD 8470D. It's always just worked with Slim on Guix and Trisquel
>> 7/8.
>> I'll try the modprobe.blacklist though.
> I tried the modprobe.blacklist=radeon in the kernel line, but GDM still
> did it's looping thing.

What .desktop files to you have under /run/current-system/profile?

There was a bug whereby GDM would enter an infinite loop when no
.desktop files were provided: <https://issues.guix.info/issue/35068>.


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