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How to replace uvesafb in the kernel for console resolution
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FrancisGreaves
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PostPosted: Tue Jun 19, 2018 1:31 pm    Post subject: How to replace uvesafb in the kernel for console resolution Reply with quote

Now that uvesafb has gone I am trying to get my console to be a particular resolution of 2560x1440 and have a theme.
One of my old Viewsonic dual Monitors died, so I got a nice Samsung monitor with a maximum resolution of 3840x2160 which gives unbelievably small text!
I use Lilo as the boot loader
My Grahpiocs card is an AMD Radeon RX470 and I am using the amdgpu drivers in the kernel
I used to have a kernel 4.12.12 with the command of
Code:
video=uvesafb:1024x768-32,mtrr:3,ywrap splash=verbose,fadein,theme:emergence console=tty1

to set up the old monitor.
This of course does not work now.
I use xranrd to set the resolution for Openbox, which works perefectly.
If I use the vga command to set the resolution in /etc/lilo.conf that is quickly overridden as the kernel loads and uses the maximum resolution it can at 3840x2160.
I have searched the Forum, and looked here http://distro.ibiblio.org/fatdog/web/faqs/boot-options.html and here https://www.kernel.org/doc/Documentation/fb/
I have tried
Code:
video=DVI-D:2560x1440-32@59 console=tty1

on the kernel command line, but it does not set the correct resolution, and there is nothing in dmesg about it.
If I try and set the theme from the command line as in:
Code:
splash_manager -c set --theme=natural_gentoo --tty=1
Error: Theme 'natural_gentoo' doesn't seem to provide a config file for the current resolution (3840x2160).


Does anyone know how I can set the resolution, so I can then add the theme?

Regards
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NeddySeagoon
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PostPosted: Tue Jun 19, 2018 1:45 pm    Post subject: Reply with quote

FrancisGreaves,

Try
Code:
video=amdgpudrmfb:1024x768-32,mtrr:3,ywrap splash=verbose,fadein,theme:emergence console=tty1


amdgpudrmfb is the name of the framebuffer you want the video statement to apply to.
My dmesg says
Code:
[    2.417567] Console: switching to colour frame buffer device 480x135
[    2.450317] amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device

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FrancisGreaves
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PostPosted: Tue Jun 19, 2018 5:02 pm    Post subject: Reply with quote

Thanks for the prompt reply, NeddySeagoon.
I am not having much luck. Have tried your suggestion, and my console is still at 3840x2160
Code:
dmesg | grep frame
[    2.512524] vesafb: framebuffer at 0xe0000000, mapped to 0xffffc90000400000, using 3072k, total 49152k
[    2.528026] Console: switching to colour frame buffer device 128x48
[    2.543720] fb0: VESA VGA frame buffer device
[    4.016589] Console: switching to colour frame buffer device 480x135
[    4.341892] amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device
[    9.031786] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]

I have set vga=791 in my /etc/lilo.conf file and the video= in the append section
What can I look for now?
Thanks
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NeddySeagoon
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PostPosted: Tue Jun 19, 2018 5:23 pm    Post subject: Reply with quote

FrancisGreaves,

Did you mount boot and run /sbin/lilo ?
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FrancisGreaves
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PostPosted: Tue Jun 19, 2018 5:39 pm    Post subject: Reply with quote

yes, I did.
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FrancisGreaves
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PostPosted: Tue Jun 19, 2018 5:42 pm    Post subject: Reply with quote

here is the kernel command line
Code:
cat /proc/cmdline
auto BOOT_IMAGE=4.14.8-gentoo ro root=UUID=6f5fbc46-7a5b-4354-8649-706e7728160f nodmraid domdadm real_root=UUID=6f5fbc46-7a5b-4354-8649-706e7728160f rootfstype=ext4 video=amdgpudrmfb:1024x768-32,mtrr:3,ywrap splash=verbose,fadein,theme:emergence console=tty1 crashkernel=64M nokaslr

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Ant P.
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PostPosted: Tue Jun 19, 2018 8:36 pm    Post subject: Reply with quote

Compile in a larger kernel font instead?
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