Interlaced resolutions hang the desktop

[Christian König]

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 
> <mailto: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 <mailto: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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