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Re: Set screen resolution in X.

From: Dmitry Nikolaev
Subject: Re: Set screen resolution in X.
Date: Mon, 31 Aug 2015 14:46:13 +0300

>> I've tried everything. Please help me. I want to help Guix, write new
>> packages and patches, but I can't. My eyes hurts because of wrong
>> resolution. Here is my full config.scm:

> Are you sure the resolution you want is supported in your X session?
> Please post the output of "xrandr".

$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
   1024x768       0.00*

Here is some of my lspci. As you can see I have Radeon card:

$ lspci | grep -i radeon
01:05.0 VGA compatible controller: AMD/ATI [Advanced Micro Devices,
Inc.] RS880M [Mobility Radeon HD 4225/4250]
01:05.1 Audio device: AMD/ATI [Advanced Micro Devices, Inc.] RS880
HDMI Audio [Radeon HD 4200 Series]

And here is the answer to the topic question. How to set screen
resolutions? Like this:

(define (my-slim-service)
        (mlet* %store-monad ((config (xorg-configuration-file
;;              #:drivers '("radeon" "vesa")
                #:resolutions '((1366 768) (1024 768))
                             (startx (xorg-start-command
                #:configuration-file config)))
        (slim-service #:startx startx)))

But it won't work for me, because of non-free radeon microcode. If I
uncomment #:drivers line I'll get error like this on X startup:

Missing Free firmware
Failed to load firmware "/*(DEBLOBBED)*/"


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