glamor requires at least 128 instructions (64 reported)

[Felix Miata]

Michel Dänzer composed on 2018-09-10 12:15 (UTC+0200):

> Felix Miata wrote:

>> Michel Dänzer composed on 2018-09-10 09:24 (UTC+0200):

>>> Felix Miata wrote:

>>>> No google hits describe why this happens or what can be done to avoid it. How
>>>> can one determine whether this is absent software, broken software, or
>>>> unsupported GPU?

>>> Unsupported GPU.

>> I figured as much, but I worded my question here as I did on purpose, trying to
>> elicit self-determination information. In the instant case I was really asking
>> on behalf of (trying to help) someone who is using an X1400 GPU getting only
>> black 800x600 output on his external display, but I've run into this error
>> message multiply before without ever finding out why glamor doesn't find the 128
>> instructions it requires.

> Because the GPU is too old to support that many instructions in a shader.

>>> The recommended driver for ATI/AMD GPUs using the radeon kernel driver
>>> is the xf86-video-ati radeon driver, which supports hardware
>>> acceleration for your GPU via EXA.

>> Does this apply to all ATI GPUs too old for the xf86-video-amdgpu driver? How
>> can a user make such a determination? Does one need to ask a developer for each
>> GPU one comes across that fails with the default/integrated driver? Can one use
>> PCI IDs or something else in a lookup table somewhere?

> If the radeon and amdgpu drivers are installed, the appropriate one is
> used by default automagically.

Do you not agree that the merger of all functionality of xf86-video-modesetting
into the server made xf86-video-* optional software for most installed GPUs?

Is there a better method than trying to start the server to determine whether a
particular xf86-video package is not optional for any particular GPU of
interest? IOW, is there a lookup method or some utility available to know in
advance if a particular GPU (is new enough to) support the 128 instructions in a
shader necessary for glamor, and thus the included modesetting driver, the video
driver that had been if not is responsible for the most commits[1], to function?

[1] https://bugs.freedesktop.org/show_bug.cgi?id=94842#c4
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