GNU bug report logs - #35408
External monitor not working with GDM

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: Danny Milosavljevic <dannym <at> scratchpost.org>, 35408 <at> debbugs.gnu.org, Diego Nicola Barbato <dnbarbato <at> posteo.de>
Subject: bug#35408: External monitor not working with GDM
Date: Thu, 02 May 2019 17:20:12 +0200

Ben Sturmfels <ben <at> sturm.com.au> skribis:

>> On Fri, 26 Apr 2019, Ludovic Courtès wrote:
>>> Ben Sturmfels <ben <at> sturm.com.au> 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>.

Ludo’.

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