Interlaced resolutions hang the desktop

[Alberto Salvia Novella]

The frame-rate at 24Hz is extremely poor for normal desktop usage.

If the highest resolution, aka 1080p, uses that refresh rate then the
desktop will default to that frame-rate.

Other progressive modes don't exhibit any issue.

On Tue, 30 Mar 2021 at 18:26, Christian König <christian.koenig at amd.com>
wrote:

> Hi Alberto,
>
> I think the driver should only support resolutions that are *progressive*,
> but also at least of *50Hz*.
>
>
> Why do you think so?, the 24Hz resolution seems to be the native one of
> the display.
>
> Regards,
> Christian.
>
> Am 30.03.21 um 17:37 schrieb Alberto Salvia Novella:
>
> 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 at 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 at 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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