[arch-general] does using kms mean that you're stick to a framebuffer with specific resolution that you can't change?

Jan Alexander Steffens jan.steffens at gmail.com
Fri Jul 12 19:37:28 EDT 2013

On Sat, Jul 13, 2013 at 7:19 AM, Xeslaro <bfsc.yb at gmail.com> wrote:
>   the maximum resolution of my laptop is 1366x768, that's also the
> framebuffer size with kms enabled. the problem is when i attach a
> monitor with resolution 1920x1080 to it, the video output is at the
> top-left corner of the monitor. and i found myself unable to change
> the framebuffer size, appending video= option to the kernel command
> line doesn't take any effect. so, i wonder is there anyway to get a
> framebuffer with resolution 1920x1080 so i can benefit from the big
> monitor while still with kms enabled?
> kernel version : 3.10.0+
> graphic card : intel hd4000

AFAIK this is not possible, as for VTs there is only one framebuffer
mirrored to all monitors. Enabling framebuffers per monitor
(fbpercrtc) would just result in the VTs using the boot monitor only.

Use X.

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