Re: Interlaced resolutions hang the desktop

[Alberto Salvia Novella <es20490446e@gmail.com>]

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This is why I'm using interlaced:

$ *xrandr*
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 16mm x 9mm
   1920x*1080i*    60.00*+  50.00    59.94
   1920x1080     *24.00*    23.98
   1280x*720*      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x576i      50.00
   720x480       60.00    59.94
   720x480i      60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
DVI-0 disconnected (normal left inverted right x axis y axis)

I think the driver should only support resolutions that are *progressive*,
but also at least of *50Hz*.

On Tue, 30 Mar 2021 at 15:41, Christian König <
ckoenig.leichtzumerken@gmail.com> wrote:

> Mhm, no idea why an interlaced resolution would cause a crash. Maybe some
> miscalculation in the display code.
>
> But apart from that if you just connected your PC to a TV I also wouldn't
> recommend using an interlaced resolution in the first place.
>
> See those resolutions only exists for backward compatibility with analog
> hardware.
>
> I think we would just disable those modes instead of searching for the bug.
>
> Regards,
> Christian.
>
> Am 30.03.21 um 11:07 schrieb Alberto Salvia Novella:
>
> I guessed so.
>
> The GPU is a Radeon HD5870, and the screen is an old Telefunken TV
> (TLFK22LEDPVR1).
>
> Since my real display got into repair I used this TV meanwhile, and to my
> surprise it froze the system.
>
> On Tue, 30 Mar 2021 at 10:15, Christian König <christian.koenig@amd.com>
> wrote:
>
>> Hi Alberto,
>>
>> well what hardware do you have?
>>
>> Interlaced resolutions are not used any more on modern hardware, so they
>> are not well tested.
>>
>> Regards,
>> Christian.
>>
>> Am 30.03.21 um 10:04 schrieb Alberto Salvia Novella:
>> > The entire desktop hangs after some minutes when using the module
>> > "radeon" with an interlaced resolution.
>> >
>> > Easier to trigger by playing a video on Firefox, at least on kwin_x11.
>> > Wayland didn't exhibit the problem.
>> >
>> > Other display drivers, from different computers I have tried, didn't
>> > allow those interlaced resolutions all together. It seems they know
>> > there will be problems.
>>
>>
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>

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