Re: 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

[Bagas Sanjaya <bagasdotme@gmail.com>]

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@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@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@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