On Thu, Apr 13, 2017 at 11:36 AM, Alex Deucher <alexdeuc...@gmail.com> wrote: > On Thu, Apr 13, 2017 at 11:03 AM, Boszormenyi Zoltan <zbos...@pr.hu> wrote: >> 2017-04-13 16:05 keltezéssel, Alex Deucher írta: >>> >>> On Thu, Apr 13, 2017 at 9:03 AM, Boszormenyi Zoltan <zbos...@pr.hu> wrote: >>>> >>>> Hi, >>>> >>>> how can I disable the behaviour in the KMS drivers >>>> that enables all outputs at once? >>>> >>>> It is very annoying that on a POS machine with an >>>> 1024x768 LVDS and a 800x480 secondary monitor (both built-in) >>>> the KMS driver wakes up both. Then the framebuffer console >>>> and plymouth use both screens, making the primary output >>>> very odd with only the top-left part used by the boot splash. >>>> >>>> I would like the boot splash to be shown only on the primary >>>> output at its full resolution instead of on all outputs using >>>> the smallest common rectangle. >>>> >>>> Is there a kernel command line configuration that achieves this? >>>> >>>> The device in question uses the gma500 kernel driver but the same >>>> behaviour is observed with the i915 and radeon drivers. >>>> >>> >>> The problem is fbdev is not multi-head aware. The fbdev emulation in >>> the KMS drivers attempts to light up all monitors so that something >>> shows up on all heads. If you really want different per head >>> configurations, you need to use the KMS API directly. As a >>> workaround, you can use the kernel command line to disable the output >>> you don't want to be lit up. See: >>> https://wiki.archlinux.org/index.php/kernel_mode_setting >>> for more info. basically add video=TV-1:d to disable the output in >>> question. Replace TV-1 with whatever connector you want to disable. >> >> >> I tried adding video=DVI-D-1:d to the kernel command line. >> >> The effect is while the second output is indeed disabled, the >> framebuffer console still takes the second output's resolution >> into account and the boot splash is still using only the top-left >> 800x480 part of the 1024x768 primary screen. >> >> Also, the secondary screen got disabled also in X which is not desired. >> Can I wake it up under X somehow? This device is using the modesetting >> DDX driver. > > Can you enable it via randr?
I think the video= based disable forces the connector to be disabled irrevocably. -ilia _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
