On Sunday, 2 March 2025 23:08:34 Greenwich Mean Time gevisz wrote:
I have AMD/ATI RV740 PRO [Radeon HD 4770]
video card connected to the PCIEX16_1 port of
my Gigabyte GA-MA790FXT-UD5P motherboard
that has no integrated video card.
My processor is AMD Phenom II X4 945,
and I believe that it has no integrated graphics
card on it as well.
This my belief is based on the fact that all this
is almost 20 years old. :)
The first K10 series APUs were launched later in the season and later on took off big time with the subsequent Bulldozer architecture, your K10 CPU has no integrated graphics cores. If you remove your graphics card, you should discover your monitor remains dark. :-)
According to https://wiki.gentoo.org/wiki/Radeon
I have set in my make.conf
VIDEO_CARDS = "radeon r600"
Also the same https://wiki.gentoo.org/wiki/Radeon
instructs: "For cards that sit in an AGP slot, enable the AGP driver."
https://uk.wikipedia.org/wiki/AGP says that PCI-Express is not AGP.
However, lsmod currently shows me that both radeon and agpgart
are loaded and used. Moreover, it shows that the radeon module
uses the agpgart module.
A selected output of lsmod command is shown below.
Module Size Used by
radeon 1613824 9
agpgart 32768 2 radeon,ttm
amdgpu 9814016 0
drm_suballoc_helper 12288 2 amdgpu,radeon
i2c_algo_bit 12288 2 amdgpu,radeon
drm_ttm_helper 12288 2 amdgpu,radeon
ttm 73728 3 amdgpu,radeon,drm_ttm_helper drm_display_helper 147456 2 amdgpu,radeon
drm_kms_helper 55648 3 drm_display_helper,amdgpu,radeon
drm 520192 16 gpu_sched,drm_kms_helper,drm_exec,drm_suballoc_helper,drm_display_helper,drm _buddy,amdgpu,radeon,drm_ttm_helper,ttm,amdxcp video
65536 2 amdgpu,radeon
drm_exec 12288 1 amdgpu
amdxcp 12288 1 amdgpu
drm_buddy 16384 1 amdgpu
gpu_sched 40960 1 amdgpu
Why? Is the apggart module really needed?
If not, why is it loaded?
Will the system work without it?
Shall I exclude it from kernel config?
AGP = Accelerated Graphics Port
A high speed bus a graphics card installed in an AGP slot uses to access and utilise the system memory.
AGPGART = AGP Graphics Address Re-mapping Table
A table to store and swap contiguous (I think) graphics data between system
and video memory.
Both the old AGP and the new(er) PCIe graphics cards use GART to manage graphics processing.
Moreover, the same lsmod table above shows
that the amdgpu kernel module is also loaded.
However, according to the note in
https://wiki.gentoo.org/wiki/AMDGPU
"Some older graphics cards are supported by both the amdgpu
and the radeon kernel module. When using AMDGPU, it is
recommended to unset the ATI Radeon option so that the radeon
module is not built, or alternatively, to blacklist the radeon module
(after rebooting check with lsmod | grep radeon to see if the
blacklisting worked). The two modules are not meant to be loaded simultaneously, unless for specific systems that require it, e.g. for multiseat configurations."
So, the same questions about ampgpu:
Is this module really needed? (I guess it is not needed.)
If not, why is it loaded?
Will the system work without it? (I guess, yes.)
Shall I exclude it from kernel config? (I guess, yes.)
My guesses are based on the fact that the lsmod table above
shows that amdgpu module is not used.
Have you added the amdgpu module in /etc/conf.d/modules? Anyway, your
graphics card uses the legacy Radeon driver and your VIDEO_CARDS entry is correct. You do not need the amdgpu driver to use your Radeon HD 4770 card.
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