Interlaced resolutions hang the desktop
Christian König
christian.koenig at amd.com
Wed Mar 31 14:36:47 UTC 2021
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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