Interlaced resolutions hang the desktop

[Alex Deucher]

On Tue, Mar 30, 2021 at 12:06 PM Alberto Salvia Novella
<es20490446e at gmail.com> wrote:
>
> 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
>    1920x1080i    60.00*+  50.00    59.94
>    1920x1080     24.00    23.98
>    1280x720      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.

The supported display modes are dictated by the monitor.  Do you still
have problems with progressive modes?  I'd hate to disable interlaced
modes if they are working fine for others.

Alex


>
> 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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>>
>>
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