bug#35408: External monitor not working with GDM

[Ben Sturmfels]

> 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.

> This is a bit of a stab in the dark, but I have been having issues with
> PostgreSQL and OpenSMTPD changing swapping UID/GIDs after reconfiguring
> or booting back into an old Guix System profile. This has required me to
> manually correct the permissions in /var/lib with `chown`. I'm
> suspicious that the same might be happening to GDM. I'll do some testing
> on this.

I also tried removing /var/lib/gdm and reconfiguring, but that didn't
seem to help, so I guess it's not a permissions issue.

Regards,
Ben

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