Interlaced resolutions hang the desktop
Christian König
ckoenig.leichtzumerken at gmail.com
Wed Mar 31 14:55:16 UTC 2021
Well the hardware is working fine as far as I can see.
Can you try to kill the X server over SSH and see if you then get some
screen update?
Regards,
Christian.
Am 31.03.21 um 16:52 schrieb Alberto Salvia Novella:
> Output
> <https://bin.privacytools.io/?0f3d7caa23b99655#CvUAikkFYSdQ9XixPHvBe7ebfaQ7nXcFVBhXAotYMPrG>.
>
> On Wed, 31 Mar 2021 at 16:36, Christian König
> <christian.koenig at amd.com <mailto:christian.koenig at amd.com>> wrote:
>
> Mhm strange.
>
> Can you get me the output of "sudo cat
> /sys/kernel/debug/dri/0/radeon_fence_info" when the problem happens?
>
> Thanks,
> Christian.
>
> Am 31.03.21 um 16:33 schrieb Alberto Salvia Novella:
>> - The computer still replies to *ping*.
>> - The *journal* shows no errors, but a few warnings
>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbin.privacytools.io%2F%3F5a0bf22220398549%23D8SPwPEh8A5BuKN6TkU78gAgEPgrUok4fCjcaucSEnyy&data=04%7C01%7Cchristian.koenig%40amd.com%7C48392451d33d4b63e5f208d8f45204d7%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637527980411072897%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=1jQLb8pO7eJYTORNisjequdWSCoKPsrrv7y%2F4U%2BojLM%3D&reserved=0>.
>> - The *mouse* doesn't freeze.
>>
>> On Wed, 31 Mar 2021 at 10:09, Christian König
>> <christian.koenig at amd.com <mailto:christian.koenig at amd.com>> wrote:
>>
>> Can you access the system over the network and see if there
>> is anything in the system log?
>>
>> It sounds like the display stack has crashed, but when the
>> sound keeps playing the system is most likely still
>> responsive over network.
>>
>> Thanks,
>> Christian.
>>
>> Am 31.03.21 um 10:05 schrieb Alberto Salvia Novella:
>>> What happens is this simple: after a few minutes, about 6 or
>>> so, the entire content of the screen stays still. In some
>>> minor situations only the applications panel of KDE Plasma.
>>>
>>> If music is playing it continues playing, so only graphics
>>> are hung. Yet in most cases the power button won't shut down
>>> the computer, as it usually does.
>>>
>>> At least this is the case using kwin on x11, and not on
>>> wayland. It only happens on "radeon" and not on Intel or
>>> "radeonhd".
>>>
>>> On Wed, 31 Mar 2021 at 09:48, Christian König
>>> <christian.koenig at amd.com <mailto:christian.koenig at amd.com>>
>>> wrote:
>>>
>>> Correct, but a TV is intended for videos only. That's
>>> why it implements only the lower HDMI standard.
>>>
>>> Interlaced transmits only halve the lines with each
>>> frame, so a 60Hz mode effectively either becomes a 30Hz
>>> mode, halving the vertical resolution or adaptive motion
>>> compensated which the know visual artifacts. Depending
>>> on what the deinterlacing setting on your TV is.
>>>
>>> You could just add a progressive 1920x540 at 60 or
>>> 1920x1080 at 30 mode manually and would have the same
>>> effect with probably better quality. See
>>> https://de.wikipedia.org/wiki/Deinterlacing
>>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fde.wikipedia.org%2Fwiki%2FDeinterlacing&data=04%7C01%7Cchristian.koenig%40amd.com%7C48392451d33d4b63e5f208d8f45204d7%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637527980411072897%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UTefQjeEYVrJto%2FqBlna%2FQKihbJe2HQG%2BczlZViFPDY%3D&reserved=0>
>>> for reference.
>>>
>>> If you can give us some more information what is
>>> happening when the system freeze we could try to narrow
>>> this down, but we can't spend much time on a very
>>> specific use case in a driver which is in maintenance mode.
>>>
>>> Regards,
>>> Christian.
>>>
>>> Am 31.03.21 um 09:21 schrieb Alberto Salvia Novella:
>>>> 24fps is intended for video only. Anything interactive
>>>> at 24fps, as just moving the mouse around, is extremely
>>>> choppy.
>>>>
>>>> No way anyone would prefer that over an interlaced
>>>> resolution or a lower resolution. That is, by far, the
>>>> worst option.
>>>>
>>>> Just try it on your screen, set it to 24Hz or alike,
>>>> and tell me your experience. You can't even tell where
>>>> the mouse is going to go.
>>>>
>>>> On Wed, 31 Mar 2021 at 08:44, Christian König
>>>> <christian.koenig at amd.com
>>>> <mailto:christian.koenig at amd.com>> wrote:
>>>>
>>>> Hi Alberto,
>>>>
>>>> well a frame rate of 24Hz is perfectly reasonable
>>>> for a TV and desktop usage.
>>>>
>>>> This is probably caused by the TVs limited HDMI
>>>> bandwidth and a refresh rate of 30/25 Hz for the
>>>> interlaced mode isn't much better either.
>>>>
>>>> Regards,
>>>> Christian.
>>>>
>>>> Am 30.03.21 um 22:59 schrieb 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
>>>>> <mailto: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
>>>>>> <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.
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> amd-gfx mailing list
>>>>>>> amd-gfx at lists.freedesktop.org <mailto:amd-gfx at lists.freedesktop.org>
>>>>>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=04%7C01%7Cchristian.koenig%40amd.com%7C48392451d33d4b63e5f208d8f45204d7%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637527980411082891%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5HXXJnOGGnEYSV%2BY%2FyWu031sE4CxFTKS2QqcKvlhhPs%3D&reserved=0>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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