Fwd: absent both plymouth, and video= on linu lines, vtty[1-6] framebuffers produce vast raster right and bottom borders on the larger resolution of two displays

[Karol Herbst]

I wouldn't be surprised if 4a16dd9d18a0 is the culprit and that it was
always broken like this with drm fbdev. Anyway, the logs don't indicate we
are actually doing anything wrong, It's just that the tty handling is a
little bonkers as always.

On Thu, May 25, 2023 at 1:37 PM Bagas Sanjaya <bagasdotme at gmail.com> wrote:

> On 5/25/23 17:55, Bagas Sanjaya wrote:
> > On 5/25/23 17:52, Bagas Sanjaya wrote:
> >> Hi,
> >>
> >> I notice a regression report on Bugzilla [1]. Quoting from it:
> >>
> >>> Original Summary:
> >>> absent both plymouth, and video= on linu lines, vtty[1-6] framebuffers
> produce vast raster right and bottom borders on the larger resolution of
> two displays
> >>>
> >>> To reproduce:
> >>> 1-connect two unequal native resolution displays to a Tesla or Firmi
> GPU
> >>> 2-don't have plymouth in use (I don't ever have it installed, so don't
> know whether it impacts)
> >>> 3-don't include e.g. video=1440x900 at 60 directive on Grub's linu lines
> >>> 4-boot Tumbleweed or Fedora 38
> >>> 5-switch to a vtty, e.g. Ctrl-Alt-F3
> >>>
> >>> Actual behavior:
> >>> 1-Both displays utilize the resolution (same pixel grid) of the lower
> resolution display
> >>> 2-Lower resolution display behaves as expected (light text on black
> background)
> >>> 3-Higher resolution display uses same pixels as lower resolution
> display, with light text on black background, leaving right side and bottom
> raster instead of black
> >>>
> >>> Expected behavior:
> >>> 1-Both displays utilize the resolution (same pixel grid) of the lower
> resolution display
> >>> 2-Lower resolution display behaves as expected
> >>> 3-Entire higher resolution display's background is black instead of
> portions in raster
> >>>
> >>> Workaround: add e.g. video=1440x900 at 60 to Grub's linu lines, which
> causes both displays to use the same nominal mode on the full display space.
> >>>
> >>> Typical other linu line options:
> >>> noresume consoleblank=0 net.ifnames=0 ipv6.disable=1 preempt=full
> mitigations=none
> >>>
> >>> My Tesla has HDMI and DVI outputs, tested with 1920x1200 and 1680x1050
> displays.
> >>> My Fermi has dual DisplayPort, tested with 2560x1440 and 1680x1050
> displays.
> >>> Occurs Tumbleweed with 6.3.2 and 6.2.12 kernel-default, and with
> 6.2.15 on Fedora 38, and (partially with Tesla, right side only) with
> 6.2.12 and 6.3.3 on Mageia 9.
> >>> Does not occur with 6.1.12 kernel-default on NVidia, or with AMD
> Caicos (Terascale2) GPU, or with Intel Eaglelake GPU.
> >>> Tested only on legacy booting (no UEFI support).
> >>> Others might describe what I call "raster" as multicolored snow.
> >>
> >> See bugzilla for the full thread and attached dmesg.
> >>
> >> Anyway, I'm adding it to regzbot:
> >>
> >> #regzbot introduced: v6.1.12..v6.2.12
> >> #regzbot title: vast raster right and bottom borders on larger display
> (two displays with inequal resolution) unless forcing resolution with
> video= parameter
> >>
> >
> > Oops, I forget to add bugzilla link:
> >
> > #regzbot introduced: v6.1.12..v6.2.12
> https://bugzilla.kernel.org/show_bug.cgi?id=217479
> > #regzbot from: Felix Miata <mrmazda at earthlink.net>
> >
>
> Oops, again, I messed up the regzbot entry (reporter field still assigned
> to me). Inconclusiving...
>
> #regzbot inconclusive: Wrong reporter assigned (from: doesn't take effect)
>
> Please ignore this thread as I will send a new one with proper regzbot
> commands.
>
> Thanks.
>
> --
> An old man doll... just what I always wanted! - Clara
>
>
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